FIGURE 3-13. PARTS LOCATION, SHINWA CASSETTE...presents a high impedance to FM and shortwave...

FIGURE 3-13. PARTS LOCATION, SHINWA CASSETTE

3-12

i

ii

iii

3-z THR” 3-19

L?L?kEE

3-x

3-x

3-x

3-z

3-z

3-z

3-z

3-z

3-z

3-3

3-4

3-4

3-5

3-53-s

3-e3-93-93-103--10z--10

3-13

FIGURE

3-z

3-4

3-5

3-s

3-7

3-e.

3-9

3-10

3-11

3--12

x--15

z--14

3--15

3-x6

n

3-x

3-z

EL?&32

3-s

3-7

3-s

3-s

3-e

3-e

3-9

3-9

3--10

3--1x

3-12

3--17

3-x8

x--14

PnCE

3-3

3-4

32. REP-CEMENT

4. Voltaae Tuned AM Circuits - The capacitances ofvaractors Dl, D2, and D3, in 'the AM tuner moduleU2, change when the DC voltage applied across themchanges and the resonant frequencies of theirassociated L-C circuits are changed. When avaractor fails, replace the U2 module.

5. Voltaue Tuned FM Circuits - The capacitances of theFM varactors, located in module lJ4, change when theDC voltage applied across them changes and theresonant frequencies of their associated L-Ccircuits are changed. When a varactor fails,replace the U4 module.

E. CLEANING

Because of thecombination head

inaccessibility of the Tape Mechanism, aand capstan cleaning tape should be used. If

the radio is disassembled, the heads, pinch rollers and capstanshafts may be cleaned with isopropyl (rubbing) alcohol.

III. CIRCUIT DESCRIPTION

A. LOGIC AND CONTROL CIRCUITS

The logic and control functions of the receiver are performedprimarily on the Audio/Logic PC Board, by the microprocessorUlOO (see Table l-3), and the frequency synthesizer U102. Themicroprocessor accepts commands from the pushbutton switcheslocated on the front of the radio and status signals from theRF board, cassette module and compact(INFINITY ONLY).

disc (CD) player

instructions toIt processes the information and generatesthe display module and the

synthesizer.frequency

The display driver controls the vacuumfluorescent display and is located in the VF display module onthe control PC board. The frequency synthesizer controls thelocal oscillator frequency and,radio.

thereby, the tuning of theThe synthesizer will tune either 200 kHz/lO kHz for

U.S. use or 100 kHz/9 kHz steps for European use.U.S. mode selection is accomplished by software.

European or

operating mode,To change the

press the SET key then the SEL key and pressthe memory one button three times in succession. For adescription of synthesizer pin functions, see Table l-4.

1-13

TABLE 1-3. MICROPROCESSOR (UlOO) PIN DESCRIPTIONS

PIN NUMBER DESCRIPTION

1 Key Input KO

2 Key Input Kl

3 Key Input K2

4 Key Input K3

5 Radio Test Pin

6 Frequency Synthesizer Enable - Allows datatransfer to the Frequency Synthesizer

7 Beep Output

8 Soft mute goes low to turn on Q102

9 Reset Input - A high on this pin for 6usec. while the oscillator is runningresets the device.

10 Serial data input and output - Providesserial data to the display driver andfrequency synthesizer.

11 Serial Clock - The serial data clock.

12 Tape Reel Input - Internally pulled up.

13 Off/On Key Input

14 CD "On" Input - Goes low for CD in.

15 I2 C Data

16 I2 C Clock

17 Power antenna on

18 N/C

19 External Oscillator - 1.98 MHz fed fromthe synthesizer

20 Ground

21 Used for display blanking

l-14

TABLE 1-3. MICROPROCESSOR (UlOO) PIN DESCRIPTIONS (Cont.)


22

23

24

25

26

27

28

29

30

31

32

33

34

35

36

37

38

39

40

Cassette read enable

Cassette write enable

AM Mono - Goes low for force to mono

Station detect - goes low for station

Joystick enable

Stereo Detect - goes low for stereo

Display Driver Enable - Allows data to betransferred to the vacuum fluorescentdisplay driver.

N/C

W C

External access connected to Vcc

Goes low for hard mute output to turn onQlOl

Power Switch Input - Goes high forignition on

Goes high for FM

Goes high for AM

Strobe 3

Strobe 2

Strobe 1

Strobe 0

Voltage Supply, Vcc + 5VDC

l-15

TABLE l-4. SYNTHESIZER (U102) PIN DESCRIPTIONS

1-16


1 Goes high during the search mode, todesensitize the front end to very weakstations.

2 Noise Reduction (high = NR on)

3 Serial data from the microprocessor

4 Data clock from the microprocessor

5 Data enable from the microprocessor

6 Switched supply voltage which isregulated by U103, a 5 volt regulator.

7 Input from the AM local oscillator

8 External bypass capacitor for the phasedetector

9 Input from the FM local oscillator

10 Ground

11 Unswitched supply voltage (Vcc) forthe clock keep alive. Keeps thesynthesizer oscillator and dividing chainactive when the remaining functions of thesynthesizer are powered down. Provides alow power microprocessor clock driver anda time-of-day indication.

12, 13 Reference oscillator which is controlledfor stability by a quartz crystal (X101),capacitors and trimmer capacitor, foraccurate setting of the clock.

14 Reference oscillator frequency divided bytwo from which the microprocessor derivesthe instruction time.

15

16

Clock signal (50 Hz) used in the programloop timing.

Resistor R124 sets the gain of the phaselocked loop.

TABLE l-4. SYNTHESIZER (U102) PIN DESCRIPTIONS (CONT.)


17 Charge pump output develops tuningvoltages and op-amp input.

18 Operational amplifier output - Suppliesthe tuning voltage for the RF circuits.

19 Operational amplifier ground.

20 Switched supply voltage, 10 volts.

1. Power-On-Reset - The power-on-reset is controlledby UlOl, see Table l-5. Input pin 2 is always highexcept when the battery voltage is disconnected.When the ignition voltage is applied, the RC timeconstant of Cl16 and R107 causes a pulse to beapplied to pins 8 and 9, which causes pin 10 to goto a logic low. Pin 10 is hard wired to pin 1.With a logic high on pin 2 and a logic low on pin1, the output pin 3 goes high. When pin 3 goeshigh, the microprocessor resets and pins 8 and 32of the microprocessor go high. This turns on QlOland QlO2, which causes the mute pin 11 of the audiooutput IC'S to go low, therefore, muting theoutput.

TABLE 1-5. QUAD 2 INPUT NAND SCHMITT-TRIGGER

INPUT A INPUT B OUTPUT

2. Analog to Digital Converter - The joystick providesa balance and fader input to A/D converter U202which places information on the Bus to allow themicrocomputer to control U105 for these functions.

1-17

B. AM CIRCUIT

1. RF Stage - The AM signals received by the antennaare coupled through the series choke Ll, whichpresents a high impedance to FM and shortwavebroadcast frequencies, and Cl to AM antenna coil Tlwhich transformer couples the RF signal to the gateof Ql a J-FET RF amplifier. Transistor Q2 thesecond RF amplifier has its conduction controlledby the RF amplifier AGC pin 1 of Ul. The RF outputof Q2 is applied to pin 1 of U2 which contains avaractor diode, fixed capacitor, trimmer capacitorand transformer tuned to resonate at the selectedfrequency.

2. Local Oscillator - The local oscillator tuning isaccomplished through pin 20 of Ul. The localoscillator is controlled by the synthesizer andtuned by the combination of fixed capacitors,trimmer capacitor, transformer and a varactor diodein U2. The output of the oscillator goes directlyto the mixer and also the synthesizer.

3. Mixer Staae - The mixer input is tuned by avaractor diode, fixed capacitor, trimmer capacitorand transformer contained in U2. The RF andoscillator are heterodyned in the mixer. The mixeroutput pin 7 of Ui is tuned to resonate at the IFor difference frequency by FL1 and applied to theIF input pin 9 of Ul through C8.

4. IF Stage - Pin 9 of Ul is the IF input which isamplified internally in Ul, and outputted on pin 10of Ul. The stage gain of the IF amplifier iscontrolled by the IF AGC pin 17 of Ul. The IF outis tuned by T2 and coupled by Cl7 to the base ofQ3. Transistor Q3 and Q4 are in the cascadeconfiguration with the output being taken off thecollector of Q4 and applied to the AM stereodecoder U3.

5. AM Station Detect - When an AM signal is received,the signal meter or station detect output pin 16 ofUl will cause Q7 to conduct which will result inJl-11 going low. When an AM station is notreceived, Q7 will be cut off and Jl-11 will gohigh.

6. Detector and AM Stereo Decoder - The AM stereodecoder chip, U3, contains circuitry to detect anddecode AM stereo from stations using the MotorolaC-Quam AM stereo system. This system uses amodified form of quadrature modulation which is

l-18

6. Detector and AM Stereo Decoder (Cont.)

compatible with monaural receivers. The phasemodulation components of a quadrature signal areextracted and used to phasemodulate the broadcasttransmitter. The (L-R) information is contained inthis quadrature phase modulation. The (L+R) istransmitted as normal AM. The chip automaticallyswitches to decode stereo when a 25 Hz, 4%modulated pilot signal is received. Stationstransmitting other systems of AM stereo arereceived in monaural, as are non-stereo stations.

The 450 kHz AM intermediate frequency is applied topin 3 of u3. The chip contains an envelopedetector which detects the (L+R) portion of thesignal. A phase locked loop (PLL) detector,utilizing an external resonator controlledoscillator, which operates at eight times the IFfrequency, to detect the (L-R) portion of thesignal. The frequency of the oscillator is 3600kHz and is applied to pin 17 with pin 18 being thefeedback pin.

The stereo pilot signal is contained in the phasemodulated (L-R) portion of the signal. This signalis controlled by an internal AGC and outputted onpin 11. A low pass filter is formed by R19 andC20, from which point the signal goes to pin 13,the input of a 25 Hz bandpass filter. The outputof the bandpass filter appears at pin 14, which isalso the pilot detector input. The pilot detectorhas two modes of operation. With a good signal itwill switch to stereo after seven consecutivecycles of the 25 Hz pilot. When interference ispresent the pilot detector requires 37 consecutivecycles of pilot to switch to stereo. Pin 12 of U3is the interference detector input. If thedetected low frequency phase modulated interferenceexceeds a certain level, the pilot detector will beprevented from switching to stereo. A greaterlevel of interference is required to switch back tomonaural if the pilot detector is already instereo. The most common type of interference thatwould require the circuitry to switch to monauralmode, would be the reception of more than onestation on the selected frequency. Pin 15 goes lowto indicate stereo. The decoder can be forced tomonaural by holding pin 9 low. When any tuningfunction is operated, pin 9 is hold low by themicroprocessor to switch the decoder to monauralfor approximately 1 second.

l-19

6. Detector and AM Stereo Decoder (Cont.)

During AM operation, transistors Q5 and Q6 conductto apply the regulated 10 volts to pin 6 of U3.The AM audio outputs pin 7 (left) and pin 8 (right)are applied to the filter/Amp IC (U7).

C . FM CIRCUIT

1. FM Front End - The completely integrated FM frontend, U4, performs the following functions AGC, RFamp, mixer, oscillator and IF. Increased qualityand reliability are achieved by integrating thediscrete components. The signal from the antennais hard wired to pin 13 and the output on pin 6 isthe intermediate frequency. Tuning voltage isapplied to pin 10 to determine the resonantfrequencies of the varactor diodes, capacitor andcoil combinations, for the RF, mixer and oscillatorstages. Search sensitivity is controlled by pin 4and the AGC input is applied to pin 3. Pin 1supplies the IF output to the synthesizer. DuringFM operation, switched supply voltage will beapplied to pin 5 because of the conduction of Q9and Q8.

2. Audio Detection and Station Detector - The IFoutput out of the front end is applied to pin 2 ofu5. The IF amplifier output has two outputs, oneto the level detector for AGC output pin 6 and theother to a buffer amplifier. The buffered IFoutput on pin 16 is connected to pin 15 by R37.Pins 14 and 15 are the inputs to the peak detectorwhich has two outputs, one for the AF amplifier andthe other to the frequency change detector. Thedetected audio is amplified and outputting on pin10. Operation of the frequency change detector isdetermined by R39, C48 and C49. Station detectsensitivity is determined by R36 and C47. Thestation detect output pin 7 turns on Q7 when astation is detected. An internal regulatorregulates the Vcc voltage level.

3. Stereo Decoder and Blend - The separation of theleft and right audio is accomplished in the FMstereo decoder U6. The multiplexed audio signalgoes in on pin 3 and is outputted as left and rightaudio pins 4 and 6. The frequency of the PLL 19kHz pilot detector is set at pin 16. The internalVco frequency can be measured at pin 11 with asufficiently high impedance counter through a 56Kresistor or greater. The IC also contains a stereo

l-20

3. Stereo Decoder and Blend (Cont.)

blend and high frequency rolloff circuit controlledby the IF AGC voltage at pins 7 and 5. Thisfeature improves the S/N of a very weak stereostation by gradually reducing the separation andhigh frequency response. The blend threshold isset by R43.

D. AUDIO CIRCUIT

1. Filter/Amplifier - The filter/amplifier IC, U7,contains an active high pass-low pass filter whichis utilized in the AM mode using input pins 15 and17. Internal diodes allow the chosen audio to passbut the other mode is blocked by reverse biaseddiodes. The dual audio amplifier is used for bothAM and FM.

2. Dynamic Noise Reduction - The noise reduction isaccomplished in U106. The IC contains circuitrywhich gives up to 10 db of effective noisereduction by varying the audio bandwidth. Whenthere is no program material present, the audiobandwidth is electronically narrowed to cut out themid and high frequency component of the noise.When music or speech with high frequency materialis present, the audio bandwidth is widened so thatthe audio fidelity is not noticeably affected. Theopening of the bandwidth takes only 500 usec. Whenthe bandwidth is open, the noise is masked by theprogram material. The bandwidth closes back down60 msec after the high frequency material in theprogram is removed. The program material isdistinguished from the noise by a dynamic levelthreshold detector. Resistors R132 and R133 setthe threshold at which the desired audio isseparated from noise. When noise reduction isturned off, pin 2 of U102 pulls pin 9 of U106 toground, causing a constantly wide audio bandwidth,and no noise reduction. The effect of the noisereduction is greatest on program materialcontaining quiet spots and low modulation.

3. Electronic - Volume, Tone, Balance and Fader - Theaudio inputs to the Audio Control Circuit, U105,come from three sources. The internal sourceselector selects the proper source and rejects theothers. The input source from the CD player(Infinity only) is applied through Cl63 to pin 8and through Cl62 to pin 21. The input source fromthe tape player is applied direct to pin 12 and topin 17. The input source for the radio is applied

l-21

3. Electronic - Volume. Tone, Balance and Fader (Cnt)

through Cl06 to pin 10 and through Cl07 to pin 19.The chosen input source is passed through externalcapacitors and on pins 13 and 16 to the DNR chipand it comes back in on pins 14 and 15 throughC120, C122; and C119, C121. The operation of U105is software controlled using a two wire I2 C Busconnected to pins 1 and 28. Capacitor Cl17 is theBass control capacitor for the left channel as Cl18is for the right. Capacitor Cl05 is the treblecontrol capacitor for the left channel as Cl06 isfor the right. Capacitors Cl07 and Cl08 are forsupply voltage filtering. The internal volume,tone and balance stages are variable depending onthe data on the 12C Bus sent by the microprocessor.The U105 has two outputs for the left channel pins3 and 4 and two outputs for the right channel pins25 and 26 and the variable fader control in the ICresponds to the data from the microprocessor.

4. Power Amplifiers - The audio power amplifiers U107,U108, U109 and UllO have their inputs capacitivelycoupled to pins 2 and 13. Muting is accomplishedby the DC voltage level on pin 11. The switchedpower is applied to pins 6 and 8 for bootstrappinga feedback technique to improve linearity and alsopin 10 for +vp (supply voltage). The devices aredual audio integrated Class B hi-fi poweramplifiers to be used in the Bridge-Tied-Load (BTL)configuration. Pin 9 is the output feed and pin 5is the output return.

E. POWER

There are four power inputs to the radio. The battery lineP107 pin 1 maintains the memory and clock functions.

ANY INTERRUPTION OF THE UNSWITCHED POWER WILL CAUSE THECLOCK TO REVERT BACK TO 12:00 AND THE RADIO TO REVERT TO530 kHz IN THE U.S. MODE.

The switched voltage is applied to P107 pin 2. Chokes LlOl andL102 provide filtering and isolate power for the left sideaudio outputs from the right side audio outputs. The switchedvoltage is necessary to get a clock display and operate theradio. The rheostat dimming line P107 pin 3 provides acontrollable dimming of the incandescent lamps and vacuumfluorescent display by varying the voltage. The side markerinput P107 pin 4 is used to lower the brightness of the vacuumfluorescent display.

1-22

F. CLOCK

The clock function is derived from the synthesizer on-chiposcillator which is stabilized by a 3.96 MHz quartz crystal(X100). Capacitor Cl31 is a fine tuning trimmer for settingthe clock accuracy. As an example, if the oscillator frequencywas 392 Hz low (196 Hz low at U102 pin 14), this would causethe clock to lose one minute per week. This same degree oferror would show up as only 79 Hz low on the AM localoscillator. See Section IV for the oscillator alignmentprocedure.

G. MECHANISM CONTROL BOARD

Because of the surface mounted devices/components (SMD), it isrecommended that board level maintenance be performed insteadof component level.

H. PREAMPLIFIER

Because of the surface mounted devices/components (SMD), it isrecommended that board level maintenance be performed insteadof component level.

IV. ALIGNMENT

A. CLOCK REFERENCE FREOUENCY SETTING

1. Standard Method - The reference oscillator can beset without opening the radio by following thismethod.

a. Turn the radio on and tune to 540 on thedisplay.

b. Connect an accurately calibrated counter to Jlpin 7 (TPl) which is accessible through thetop cover, see Fig. 1-4. This should displaythe AM local oscillator frequency, 990 kHzwhen the radio is tuned to 540.

C . Adjust Cl31 to give a local oscillatorfrequency of exactly 990 kHz +/- Hz. Trimmercapacitor C131, which is on the audio logicboard, can be adjusted with a long tuning toolthrough a hole in the top cover and RF board,see Fig. l-4.

l-23

2. Alternate Method - This method is used when afrequency counter is unavailable, and useslissajous patterns. A standard laboratoryoscilloscope with two low capacitance (X10) probesand a known good electronic tuned radio with (3.96MHz XTAL), for a frequency standard, are requiredfor this procedure (see Fig. l-5).

a.

b.

C .

d.

e.

Gain access to U102 pin 14 of the frequencystandard radio and connect it to theoscilloscope horizontal input.

Connect U102 pin 14 of the radio under test tothe oscilloscope vertical input.

Connect both radios to a power source ofswitched and unswitched voltage, as describedin the service notes. (13.2V)

With oscilloscope horizontal sweep, set toexternal, adjust the oscilloscope vertical andhorizontal gain controls to obtain arectangular or circular pattern (see Fig.l-5).

Slowly adjust the trimmer capacitor Cl31 onthe radio under test to obtain as near aspossible, a stationary pattern. One completerevolution of the pattern per second indicatesa difference in frequency of 1 HZ.

1-24

(Q7-B Jl PIN 7ITP31 (TP1)

Cl31 ONAUDIO/LOGIC

R50(FM STEREOPILOT)

PC BOARD

T3FM PEAK DET

U6 PIN ll(TP4l)

I \R44 R43(SEPARATION! (BLEND)

FIGURE 1-4. ALIGNMENT LOCATIONS

ELECTRONICTUNEDRADIO

(REFERENCE)

U102PIN 14 x10

HORIZONTAL ININPUT

PROBE 0

FIGURE 1-5. LISSAJOLIS PATTERN TEST SET-UP

1-25

B. AM ALIGNMENT PROCEDURE

The AM tuned circuits are factory aligned and alignment is notrecommended. However, the AM dummy antenna detail is shown inFigure l-6 for an aid in diagnosis.

PLUG TO FIT RECEIVERANTENNA CONNECTOR

40 PF 7

TO SIGNAL TO RECEIVERGENERATOR - - ANTENNA

CONNECTOR

APPLICABLE SIGNALGENERATOR IMPEDANCEMATCHING RESISTOR

METAL SHIELD CANMUST BE ATTACHEDTO PLUG

FIGURE l-6. AM DUMMY ANTENNA DETAIL

C . FM ALIGNMENT PROCEDURE

Connect an 8 Ohm, 20 watt, resistive load in place of eachspeaker and connect an audio voltmeter across each of the frontspeaker loads.

CAUTION

BOTH INPUT TERMINALS OF THE VOLTMETER MUST BEISOLATED FROM GROUND.

Connect a signal generator through an FM dummy antenna, (seeFigure l-7), to the receiver antenna connector, adjust thesignal generator for 22.5 kHz deviation at 400 Hz. Connect a13.2 volt power supply to the receiver power leads.

PLUG TO FIT RECEIVERANTENNA CONNECTOR

1-26

FIGURE l-7. FM DUMMY ANTENNA DETAIL

FM ALIGNMENT

ReceiverStep Test Signal Tuned To Adjustments, see Figure 4.

STATION DETECTOR - FINE ADJUSTMENT

1. 97.9 MHZ 97.9 MHz Set the signal generatoroutput to 5 uv. Adjust T3so that the radio is unmutedat 97.9 MHz and mutes whentuned to either 97.7 MHz or98.1 MHz.

FM STEREO ALIGNMENT

2. Set the signal generator output to 1 mv for quieting.Do not modulate. Do not use stereo pilot. Connect afrequency counter through a 56K Ohm series resistor toTP4 (pin 11 of U6).

97.9 MHz 97.9 MHz Adjust R65 for 19 kHz signalat U6-pin 11.

STEREO BLEND

3. Set the signal generator output to 15 uv. Modulate with400 Hz, 22.5 kHz deviation. Turn the stereo pilot on.

97.9 MHz 97.9 MHz Begin with R43 and R44adjusted to the fullclockwise position.

4. 97.9 MHz 97.9 MHz Adjust R43 for 10 db ofstereo separation at 400 Hz.

5. 97.9 MHz 97.9 MHZ Increase the signalgenerator output to 3 mv andadjust R44 for maximumstereo separation.

6. 97.9 MHz 97.9 MHz Recheck the stereoseparation at 15 uv. If itdoes not fall between 11 dband 15 db, readjust R43 for13 db of stereo separation.

1-27

V. DISASSEMBLY AND ASSEMBLY PROCEDURE

A. DISASSEMBLY PROCEDURE

In order to replace components in the Electronic Tune CassetteRadio, the following removal steps must be performed (see Tablel-6 for removal sequence).

TABLE 1-6. ELECTRONIC TUNE RADIO REMOVAL SEQUENCE

r Steps To Be Part LocationPart Performed Figures

Escutcheon/Switch Assembly 1 1-8 and l-10

Control Board 1 and 2 l-10

Top Cover 3 1-16

Tape Mechanism Assembly 1 and 4 l-14

RF PC Board Assembly 1,3,4 and 5 l-13

Audio/Logic PC Board Assembly 1,3,4,5 and 6 l-15

Static Display Module Assembly 1 and 2 l-11

Tape Mechanism Sub-Assembly 4 and 8

1. Escutcheon/Switch Assemblv Removal - To remove theEscutcheon/Switch Assembly, perform the followingsteps (see Figure l-8).

a. Remove two screws from the left side front andtwo screws from the right side front of thechassis.

b. Pull assembly forward sufficiently to unplugthe Audio-Control Cable Assembly (W202), (seeFigure l-10). Place a flat blade screwdriverblade under flange of the connector and prythe connector out.

2. Control PC Board Assemblv Removal - To remove theControl PC Board Assembly (117), depress the sixretainer tabs, and remove from the escutcheon (seeFigure l-10).

1-28

WHEN RE-INSTALLING THE CONTROL BOARD,PLACE THE JOYSTICK IN THE CENTER ANDLAY THE BOARD STRAIGHT INTO THE ESCUTCHEON.GENTLY PRESS IN WITH THUMBS IN CLEAR AREASOF THE BOARD UNTIL IT SNAPS IN. EXERCISEEACH SWITCH FOR PROPER SWITCH SHAFT SEATING.

3. Top Cover Removal - To remove the Top Cover (107),remove two screws from top rear of radio and liftcover off, remove the Top Cover Insulator (103),(see Figure 1-16).

4. Tave Mechanism Assembly Removal - To remove theTape Mechanism Assembly, perform the followingsteps:

a. Remove two screws on rear.

b. Disconnect the Radio/Tape Interface Cable fromHeader P103 (see Figure 1-14).

5. RF PC Board Assembly Removal - To remove the RF PCBoard Assembly (115), perform the following steps:

a. Desolder the five tabs from the chassis tofree the board (see Figure l-13).

b. Lift the RF PC board assembly gently out.P104 will unplug from Jl as the board islifted out.

6. Audio/Logic PC Board Assemblv Removal - To removethe Audio/Logic PC Board Assembly (116), performthe following steps:

a. Desolder five ground tabs located two on eachend and one in back of the PC board (seeFigurel-15).

b. Remove four screws that hold the audio IC's tothe heatsink, one on each end and two in theback.

C . Drop the audio/logic board down and out of theheat sink.

1-29

7. Static Display Module Removal - To remove thestatic disulav module (U201). (see Fiqure l-11),desolder the static dispiay module from the controlPC board. As with all components on the controlboard, care must be taken to preserve the coppertracts on top of the PC board, as well as thebottom. When installing a new display board, makesure of a good top side connection as well asbottom. Damaged tracts may be repaired with a thingage, solid conductor wire.

8. Cassette Tape Mechanism Subassemblv Removal - Toremove the Cassette Tape Mechanism Subassembly,remove the four Phillips head screws on the bottomcover. The tape mechanism subassembly should nowbe free.

B. ASSEMBLY PROCEDURE

Reverse the component removal sequence to reassemble the radio.

KNOB ESCUTCHEONJOYSTICK ,110, BLK11011 (111) BRT

LENS,114) INFINITY(114) PREMIUM

FIGURE l-8. PARTS LOCATION, ESCUTCHEON ASSEMBLY

l-30

INSULATOR HEATSINK.GROUND SCREW CHASSIS ASSEMBLY

FIGURE l-9. PARTS LOCATION, HEAT SINK/CHASSIS ASSEMBLY

FIGURE

TAPE DOOR TAPE DOOR TAPE DOOR ESCUTCHEON[DOOR) PIN (PIN) SPRING (SPRING) ASSEMBLY

(1 10) BLK(111) BRT

l-10. PARTS LOCATION, BACK OF ESCUTCHEON ASSEMBLY

1-31

KNOBJOYSTICK(101)

CONTROL JOYSTICK(R202) ELK(R202) SRT -SPEC. 2 SPKRS

MODULESTATIC DISPLAY(U201)

FIGURE l-11. PARTS LOCATION, CONTROL PC BOARD

ANTENNA MODULE HEADERAM RFTUNER(U2)

\

l4PIN(J1)

MODULE MODULEFM, RF, MIX. FILTER/AMPosc (U4) (U7)

FIGURE 1-12. PARTS LOCATION, RF PC BOARD

1-32

CHASSISSOLDERPOINT

CHASSISSOLDER

CHASSISSOLDERPOINT

FIGURE 1-13. PARTS LOCATION, RF BOARD

AUDIO AMPLIFIERIC (U

AUDIO AMPLIFIER DRIVER OVERLAY CLIP AUDIO AMPLIFIERIC (U109) IC (U112) (109) IC (U110)

\ I / CLIP

CHASSIS‘SOLDERPOINT

CHASSIS

POINT

HEADER HEAOER(P103) (PlOlA)

HEADER TRIMMER AUDIO AMPLIFIER(P101B) CAP (C131, IC (U108)

FIGURE 1-14. PARTS LOCATION, AUDIO/LOGIC PC BOARD

l-33

CHASSISSOLDERPOINT

SOLDERPOINT

CHASSISSOLDERPOlNT

CHASSISSOLDERPOINT

CHASSISSOLDERPOINT

FIGURE 1-15. PARTS LOCATION, AUDIO/LOGIC PC BOARD

INSULATOR TOP COVERTOP COVER (107)11031 I

RF PCBOARD ASSEMBLY(115)

CHASSIS ASSEMBLY(1 0 8 )

FIGURE 1-16. PARTS LOCATION, R/F BOARD, WITH INSULATOR

l-34

CONNECANTENN(PI)

TOR

^\

CONNECTOR CONNECTORREMOTE INFINITY ONLY(P105) (P102)

CABLE ASSEMBLYSPEAKER (P106)

CABLE ASSEMBLYPOWER (P10)

FIGURE 1-17. PARTS LOCATION, REAR VIEW

1-35

REPLACEMENT PARTS LIST, ELECTRONIC TUNED MULTIPLEX, CASSETTE RADIO

REFERENCE PARTNUMBER NUMBER DESCRIPTION

DIODES, TRANSISTORS, IC'S(RF BOARD ASSEMBLY, P/N 4393206-l:4393206-2)

DlD2

Q1

::

;z

;;Q8Q9QlOUlu2u3u4u5U6u7

4231205-A Diode, Switch3600875 Diode, Pin4231205-A Diode, Switch4234554-R Transistor, NPN, JFET4234555-R Transistor, NPN4234555-R Transistor, NPN4234556-R Transistor, PNP4232198-R92 Transistor, PNP3596339-R Transistor, NPN4230891-R Transistor, NPN4232198-R92 Transistor, PNP3596339-R Transistor, NPN3596339-R Transistor, NPN4234550 IC, AM Signal Processor4234422 Module, A M RF Tuner4233034 IC, AM Stereo Decoder4234553 Module, FM RF/MIX/OSC4393690, IC, FM Detector4230078 IC, FM Stereo Decoder4234423 Module, Filter - Amplifier

DIODES, TRANSISTORS, IC'S(AUDIO/LOGIC BOARD ASSEMBLY,P/N 4393222-1; 4393222-2)

DlOO 4231205-A Diode, S w i t c hDlOl 4231205-A Diode, SwitchD102 4230853-A Diode, Zener, 5.6VD103 4231204-A201 Diode, Rectifier, 200VD104 4234567 Diode, Rectifier, 400VD105 4231204-A201 Diode, Rectifier, 200VD106 4233049-R Diode, Stabilizer, 2.38VQlOO 4232553-R92 Transistor, NPNQlOl 4232553-R92 Transistor, NPNQ102 4232553-R92 Transistor, NPNQ103 3600963-R Transistor, NPNUlOO 4516271 IC, MicroprocessorUlOl 4234590 IC, Quad 2-Input NANDU102 4234412 IC, SynthesizerU103 4234592 IC, Regulator 5VU104 4233042 IC, Regulator 1OVU105 4234545 IC, Audio Control 6300

l-36


REFERENCENUMBER

U106 4230862U107 4234547U108 4234547U109 4234547UllO 4234547Ulll 4392808-RU112 4392807

D201D202D203Q201U201U202

L2 4233116-AlTl 4234551T2 4234552T3 4234558Xl 4234539x2 4393274-RFL1 4234549FBl 3599705FB2 3599705Xl00 4232720LlOl 4234577L102 4234577L103 4393213K100 4393212

PARTNUMBER

4231205-A4231205-A4231200-A1404234414-N43923994234546

DESCRIPTION

DIODES, TRANSISTORS, IC'S(AUDIO/LOGIC BOARD ASSEMBLY,P/N 4393222-l: 4393222-2)

IC, DNRIC, Audio AmplifierIC, Audio AmplifierIC, Audio AmplifierIC, Audio AmplifierIC, Regulator, 5VIC, Driver Overlay

DIODES, TRANSISTORS, IC's(CONTROL BOARD ASSEMBLY, P/N4234484)

Diode, SwitchDiode, SwitchDiode, Zener 14VTransistor, NPNModule, Static DisplayIC, A/D Converter

CRYSTALS, COILS, TRANSFORMERS,FILTERS (RF BOARD ASSEMBLY,P/N 4393206-l: 4393206-2)

Inductor, Fixed 4.7 uHyTransformer, AM AntennaTransformer, AM IFTransformer, FM DetectorResonator, AM, Stop DETResonator, AM, RadialFilter, AM IFFerrite BeadFerrite BeadCrystal, 3.96 MHzInductor, Supply Filter, 600 uHInductor, Supply Filter, 600 uHInductor, Audio Filter, 800 uHRelay, DPDT

l-37


REFERENCE PARTNUMBER NUMBER

Cl

c2

C4

c5C6

C7C8

C9

Cl0Cl1

Cl2Cl3

Cl4Cl5Cl6

Cl7

Cl8

cl.9

C20C21

C22

C23C24C25

C26C27

C28

4231063RAY5S103M24231061-RACOG330J34231063-RAY5S473Ml4230650-234231063-RAY5S104Ml4230650-164231063-RAY5S473Ml4231063-RAY5S104Ml4230650-184231063-RAY5S473Ml4230650-194231063-RAY5S473Ml4230650-174234411-24231063-RAY5S473Ml4231072-AY5R103M4231072-AY5R103M4231072-AY5R103M4230650-194231059-R334J04231059-R334JO4230650-174230650-254231059-R102Kl4230650-224231059-R332Jl4230650-17

DESCRIPTION

CAPACITORS, (RF BOARD ASSEMBLY,P/N 4393206-l; 4393206-Z)

Capacitor, Disc, 0.01 MF, 25V

Capacitor, Disc, 33 PF, 50V


Capacitor, Elect., 100 MF, 16VCapacitor, Disc, 0.1 MF, 16V

Capacitor, Elect., 1.0 MF, 50VCapacitor, Disc, 0.047 MF, 16V




Capacitor, Elect., 2.2 MF, 50VCapacitor, Elect., 330 MF, 16VCapacitor, Disc, 0.047 MF, 16V

Capacitor, Tubular Ceramic,0.01 MF, 25VCapacitor, Tubular Ceramic,0.01 MF, 25VCapacitor, Tubular Ceramic,0.01 MF, 25VCapacitor, Elect., 4.7 MF, 50VCapacitor, Poly., 0.33 MF, 50V

Capacitor, Poly., 0.33 MF, 50V

Capacitor, Elect., 2.2 MF, 50VCapacitor, Elect., 10 MF, 16VCapacitor, Poly., 0.001 MF, 63V

Capacitor, Elect., 47 MF, 16VCapacitor, Poly., 0.0033 MF, 63V

Capacitor, Elect., 2.2 MF, 50V

1-38



CAPACITORS, (RF BOARD ASSEMBLY,P/N 4393206-l; 4393206-2)

c29

c30

c31C32

c33

c34

c35

C36

c37

C38c39

C40

c41

C42

c43

c44

c45

C46

c47

C48c49C50

c51

C52

4231059- Capacitor, Poly., 0.0033 MF, 63VR332Jl4231059- Capacitor, Poly., 0.0033 MF, 63VR332Jl4230650-25 Capacitor, Elect., 10 MF, 16V4231059- Capacitor, Poly., 0.9033 MF, 63VR332Jl4231059- Capacitor, Poly., 0.047 MF, 1OOVR473X24232777- Capacitor, Poly., 0.01 MF, 50VR103KO4231061- Capacitor, Disc, 51 PF, 50VRACOG510J34231071- Capacitor, Tubular Ceramic, 270 PF,AY5P271K 5ov4231063- Capacitor, Disc, 0.047 MF, 16VRAY5S473Ml4234569-l Capacitor, Elect., 1000 MF, 1OV4231063- Capacitor, Disc, 0.047 MF, 16VRAY5S473Ml4231072- Capacitor, Tubular Ceramic, 150 PF,AY5P151M 5ov4231063- Capacitor, Disc, 0.1 MF, 16VRAY5S104Ml4231063- Capacitor, Disc, 0.01 MF, 25VRAY5S103M24231063- Capacitor, Disc, 0.01 MF, 25VRAY5S103M24231063- Capacitor, Disc, 0.01 MF, 25VRAY5S103M24231061- Capacitor, Disc, 5.6 PF, 1OOVRACOH5R6J44231061- Capacitor, Disc, 15 PF, 50VRACOG150J34232777- Capacitor, Poly. 0.01 MF, 50VR103KO4230650-17 Capacitor, Elect., 2.2 MF, 50V4230650-25 Capacitor, Elect., 10 MF, 16V4231062- Capacitor, Disc, 500 PF, 1OOVRAY5S501M44231062- Capacitor, Disc, 500 PF, 1OOVRAY5S501M44230650-18 Capacitor, Elect., 3.3 MF, 50V



CAPACITORS, (RF BOARD ASSEMBLY,P/N 4393206-l: 4393206-2)

c53

c54c55C56

c57

C58c59C60

C61C62

C63

C64

4231063- Capacitor, Disc, 0.01 MF, 25VRAY5S103M24230650-15 Capacitor, Elect., 0.47 MF, 50V4230650-16 Capacitor, Elect., 1.0 MF, 50V4231059- Capacitor, Poly., 0.068 MF, 63VR683Xl4231064- Capacitor, Polyprop., 750 PF,R751JO 5ov4230650-15 Capacitor, Elect., 0.47 MF, 50V4230650-16 Capacitor, Elect., 1.0 MF, 50V4231059- Capacitor, Poly., 0.033 MF, 63VR333Jl4230650-25 Capacitor, Elect., 10 MF, 16V4232777- Capacitor, Poly. 0.027 MF, 1OOVR273K24232777- Capacitor, Poly. 0.027 MF, 1OOVR273K24234411-2 Capacitor, Elect., 330 MF, 16V

CAPACITORS, (AUDIO/LOGIC BOARDASSEMBLY, P/N 4393222-1, 4393222-2)

Cl00

Cl01

Cl01

Cl02

Cl02

Cl03Cl04Cl05Cl06Cl07

4231059- Capacitor, Poly., 0.01 MF, 50VR103KO4232777- Capacitor, Poly., 0.0056 MF, 1OOVR562K2 (Premium)4232777- Capacitor, Poly., 0.0047 MF, 1OOVR472K2 (Infinity)4232777- Capacitor, Poly., 0.0056 MF, 1OOVR562K24232777- Capacitor, Poly., 0.0047 MF, 1OOVR472K2 (Infinity)4230650-20 Capacitor, Elect., 22 MF, 16V4230650-23 Capacitor, Elect., 100 MF, 16V4230650-25 Capacitor, Elect., 10 MF, 16V4230835-R4 Capacitor, Bi-Polar, 2.2 MF, 16V4230835-R4 Capacitor, Bi-Polar, 2.2 MF, 16V

l-40


REFERENCENUMBER

Cl08

Cl.08

Cl09Cl10

Cl10

Cl11Cl12Cl13Cl14

Cl15

Cl16

Cl17Cl18Cl19

Cl20

Cl21

Cl22

Cl24

Cl25

Cl26

Cl27

Cl28

Cl29Cl30

Cl31

PARTNUMBER

4232777-R683Kl4232777-R823Kl4230835-R44232777-R683Kl4232777-R823Kl4230835-R44230835-R44230835-R44232777-R392KO4232777-R392KO4231059-R104KO4230650-234230650-174232777-R473K24232777-R104KO4231059-R102Kl4232777-R473K24232777-R104KO4232777-R104KO4232777-R104KO4231071-AY5P102K4232777-R103KO4230650-234231059-R222Jl4232682

DESCRIPTION

CAPACITORS, (AUDIO/LOGIC ASSEMBLY,P/N 4393222-l; 4393222-2)

Capacitor, Poly.,, .068 MF, 63V(Premium)Capacitor, Poly., .082 MF, 63V(Infinity)Capacitor, Bi-Polar, 2.2 MF, 16VCapacitor, Poly., .068 MF, 63V(Premium)Capacitor, Poly., .082 MF, 63V(Infinity)Capacitor, Bi-Polar, 2.2 MF, 16VCapacitor, Bi-Polar, 2.2 MF, 16VCapacitor, Bi-Polar, 2.2 MF, 16VCapacitor, Poly., .0039 MF, 50V

Capacitor, Poly., .0039 MF, 5oV


Capacitor, Elect., 100 MF, 16VCapacitor, Elect., 2.2 MF, 50VCapacitor, Poly., .047 MF, 1OOV


Capacitor, Poly., .OOl MF, 63V

Capacitor, Poly., .047 MF, 1OOV




Capacitor, Tubular Ceramic, .OOl MF5ovCapacitor, Poly., 0.01 MF, 50V

Capacitor, Elect., 0.001 MF, 16VCapacitor, Poly., .0022 MF, 63V

Capacitor, Trimmer, 5.5-18 PF, 3ov



CAPACITORS, (AUDIO/LOGIC ASSEMBLY,P/N 4393222-1: 4393222-Z)

Cl32

Cl33

Cl34Cl35Cl36

Cl37

Cl38Cl39Cl40

Cl41

Cl42Cl43

Cl44

Cl45

Cl46

Cl47Cl48Cl49Cl50Cl51Cl52

Cl52

Cl53

Cl54Cl55

Cl55

Cl56Cl57

4231061- Capacitor, Disc, 20 PF, 1OOVRACOG200J44231061- Capacitor, Disc, 150 PF, 1OOVRACOG151J44230650-18 Capacitor, Elect., 3.3 MF, 50V4230650-17 Capacitor, Elect., 2.2 MF, 50V4231070- Capacitor, Tubular Ceramic, 100 PF,AS2LlOlJ 5ov4231070- Capacitor, Tubular Ceramic, 3.3 PF,ACOH3R3K 5ov4230650-15 Capacitor, Elect., 0.47 MF, 50V4234411-2 Capacitor, Elect., 330 MF, 16V4232777- Capacitor, Poly., 0.1 MF, 50VR104KO4232777- Capacitor, Poly., 0.1 MF, 50VR104KO3600689 Capacitor, Elect., 330 MF, 16V4231059- Capacitor, Poly., 0.1 MF, 50VR104KO4231059- Capacitor, Poly., 0.047 MF, 1OOVR473M24231059- Capacitor, Poly., 0.047 MF, 1OOVR473M24231059- Capacitor, Poly., 0.047 MF, 1OOVR473M24393214-1 Capacitor, Elect., 2200 MF, 16V4393214-1 Capacitor, Elect., 2200 MF, 16V3600599 Capacitor, Elect., 1500 MF, 16V3600599 Capacitor, Elect., 1500 MF, 16V3230650-37 Capacitor, Elect., 0.47 MF, 50V4232777- Capacitor, Poly., 0.027 MF, 1OOVR273K2 (Premium)4232777- Capacitor, Poly., 0.01 MF, 1OOVR103KO (Infinity)4231059- Capacitor, Poly., 0.22 MF, 50VR224KO4230650-37 Capacitor, Elect., 0.47 MF, 50V4232777- Capacitor, Poly., 0.027 MF, 1OOVR273K2 (Premium)4232777- Capacitor, Poly., 0.01 MF, 1OOVR103KO (Infinity)3600599 Capacitor, Elect., 1500 MF, 16V4230650-37 Capacitor, Elect., 0.47 MF, 50V

l-42



CAPACITORS, (AUDIO/LOGIC ASSEMBLY,P/N 4393222-1: 4393222-2)

Cl58

Cl58

Cl59

Cl60Cl61

Cl61

Cl62

Cl63

Cl64

Cl65

4232?77- Capacitor, Poly., 0.027 MF, 1OOVR273K2 ( P r e m i u m )4232777- Capacitor, Poly., 0.01 MF, 1OOVR103KO (Infinity)4231059- Capacitor, Poly., 0.22 MF, 50VR224KO4230650-37 Capacitor, Elect., 0.47 MF, 50V4232777- Capacitor, Poly., 0.027 MF, 1OOVR273K2 (Premium)4232777- Capacitor, Poly., 0.01 MF, 1OOVR103KO (Infinity)4232835-R4 Capacitor, Bi-Polar, 2.2 .MF, 16V

(Infinity)4232835-R4 Capacitor, Bi-Polar, 2.2 MF, 16V

(Infinity)4232777- Capacitor, Poly., 0.1 MF, 50VR104KO4230650-23 Capacitor, Elect., 100 MF, 16V

CAPACITORS, (CONTROL BOARDASSEMBLY, P/N 4234484)

c201c202

4393208-l4231072-AY5R223M

Capacitor, Elect., 100 MF, 16VCapacitor, Tubular Ceramic, .022 MF25V

RESISTORS, (RF BOARD ASSEMBLY,P/N 4393206-l; 4393206-2)

RlR2R3R4R5R6R7R8R9R10Rll

4231017-R270 Resistor, l/8 W, 27 Ohm, + 5%4231017-R561 Resistor, l/8 W, 560 Ohm, + 5%4231017-R561 Resistor, l/8 W, 560 Ohm, + 5%4231017-R680 Resistor, l/8 W, 68 Ohm, + 5%4231017-R103 Resistor, l/8 W, lOK, + 584231017-R103 Resistor, l/8 W, lOK, + 5%3597091-302 Resistor, l/4 W, 3.OK, t 5%4231017-R101 Resistor, l/8 W, 100 Ohm, + 5%3597091-181 Resistor, l/4 W. 180 Ohm, + 5%3597091-103 Resistor, l/4 W, lOK, + 5%4231017-R472 Resistor, l/8 W, 4.3K, + 5%

1-43



RESISTORS, (RF BOARD ASSEMBLY,P/N 4393206-l: 4393206-2)

R12 4231017-R333 Resistor, l/8 W, 33K, + 5%R13 4231017-R332 Resistor, l/8 W, 3.3K, f. 5%R14 4231017-R221 Resistor, l/8 W, 220 Ohm, f. 5%R15 4231017-R471 Resistor, l/8 W, 470 Ohm, f. 5%R16 4231017-R331 Resistor, l/8 W, 330 Ohm, + 5%R17 3597091-220 Resistor, l/4 W, 22 Ohm, + 5%

R 1 8 3597091-272 Resistor, l/4 W, 2.7K, + 5%R19 3597091-431 Resistor, l/4 W, 430 Ohm, + 5%R20 3597091-162 Resistor, l/4 W, 1.6K, + 5%R21 3597347-8251 Resistor, l/4 W, 8.25K, + 5%R22 3597091-162 Resistor, l/4 W, 1.6K, + 5%R23 4231017-R623 Resistor, l/8 W, 62K, + 5%R24 4231020-R3163 Resistor, l/8 W, 316K, + 1%R25 3597347-1371 Resistor, l/4 W, 1.37K, + 1%R26 3597091-431 Resistor, l/4 W, 430 Ohm, + 5%R27 3597091-100 Resistor, l/4 W, 10 Ohm, + 5%R28 3597091-122 Resistor, l/4 W, 1.2K, + 5%R29 3597091-273 Resistor, l/4 W, 27K, + 5%R30 3597091-153 Resistor, l/4 W, 15K, t 5%R31 3597091-103 Resistor, l/4 W, lOK, + 5%R33 3597091-102 Resistor, l/4 W, lK, + 5%R34 3597091-124 Resistor, l/4 W, 120K, + 5%R35 3597091-101 Resistor, l/4 W, 100 Ohm, + 5%R36 4231017-R472 Resistor, l/8 W, 4.3K, + 5%R37 4231017-R122 Resistor, l/8 W, 1.2K, + 5%R38 4231017-R223 Resistor, l/8 W, 22K, + 5%R39 4231017-R512 Resistor, l/8 W, 5.1K, + 5%R40 3597091-331 Resistor, l/4 W, 330 Ohm, + 5%,R41 3597091-101 Resistor, l/4 W, 100 Ohm, + 5%R42 3597091-103 Resistor, l/4 W, lOK, + 5%R43 4234582-224 Resistor, Variable, 220KR44 4234582-104 Resistor, Variable, 1OOKR45 3597091-103 Resistor, l/4 W, lOK, + 5%R46 3597091-513 Resistor, l/4 W, 51K, + 5%R47 3597091-103 Resistor, l/4 W, lOK, + 5%R48 3597091-103 Resistor, l/4 W, lOK, + 5%R49 3597347-1912 Resistor, l/4 W, 19.1K, + 1%R50 4234582-502 Resistor, Variable, 5KR51 3597091-102 Resistor, l/4 W, lK, + 5%R52 3597091-180 Resistor, l/4 W, 18 Ohm, + 5%R53 3597091-103 Resistor, l/4 W, lOK, + 5%R54 3597091-122 Resistor, l/4 W, 1.2K, + 5%R55 3597091-273 Resistor, l/4 W, 27K, + 5%

l-44



RESISTORS, (RF BOARD ASSEMBLY,P/N 4393206-l; 4393206-2)

R56R57R58

3597091-153 Resistor, l/4 W, 15K, + 5%3597091-103 Resistor, l/4 W, lOK, + 5%3597091-102 Resistor, l/4 W, lK, + 5%

RESISTORS, (AUDIO/LOGIC BOARDASSEMBLY; P/N 4393222-l: 4393222-2)

RlOlR102R103R104R105R106R107R108R109RllORlllR112R113R114R115R116R117R118R119R120R121R122R123R124R125R126R127R128R129R130

3597091-103 Resistor, l/4 W, lOK, + 5%3597091-103 Resistor, l/4 W, lOK, + 5%3597091-103 Resistor, l/4 W, lOK, + 5%3597091-103 Resistor, l/4 W, lOK, + 5%3597091-223 Resistor, l/4 W, 22K, + 5%3597091-223 Resistor, l/4 W, 22X, + 5%3597091-104 Resistor, l/4 W, lOOK, + 5%3597091-101 Resistor, l/4 W, 100 Ohm, + 5%3597091-102 Resistor, l/4 W, lK, + 5%3597091-101 Resistor, l/4 W, 100 Ohm, + 5%3597091-512 Resistor, l/4 W, 5.1K, + 5%3597091-103 Resistor, l/4 W, lOK, + 5%3597091-392 Resistor, l/4 W, 3.9K, + 5%3597091-106 Resistor, l/4 W, lOK, + 5%3597091-512 Resistor, l/4 W, 5.1K, t 5%4231017-R683 Resistor, l/8 W, 68K, + 5%4231017-R104 Resistor, l/8 W, lOOK, 2 5%4231017-R273 Resistor, l/8 W, 27K, + 5%3597091-273 Resistor, l/4 W, 27K, + 5%3597091-273 Resistor, l/4 W, 27K, + 5%3597091-273 Resistor, l/4 W, 27K, t 5%35997091-101 Resistor, l/4 W, 100 Ohm, + 5%4231017-R512 Resistor, l/8 W, 5.1K, + 5%4231017-R102 Resistor, l/8 W, lK, + 5%3597091-102 Resistor, l/4 W, lK, + 5%3597091-102 Resistor, l/4 W, lK, + 5%3597091-102 Resistor, l/4 W, lK, + 5%4231017-R202 Resistor, l/8 W, 2K, + 5%(Infinity)4231016-A2F91 Resistor, WW_Fusible,2W,91 Ohm,+ 5%4231017-R152 Resistor, l/8 W, 1.5K, + 5%

(Infinity)R131R132R133R134

4231017-R103 Resistor, l/8 W, lOK, + 5%3597091-103 Resistor, l/4 W, lOK, + 5%3597091-154 Resistor, l/4 W, 150K, + 5%4231017-R304 Resistor, l/8 W, 300K, + 5%

1I

1-45



RESISTORS, (AUDIO/LOGIC BOARDASSEMBLY, P/N 4393222-l: 4393222-2'

R135R136R202

R202R203

4231017-R272 Resistor, l/8 W, 2.7K, + 5%4231017-R272 Resistor, l/8 W, 2.7X, + 5%4392343 Control, Joystick, Yellow (Special

Premium)4234568 Control, Joystick (Premium)4231106- Resistor, lW, 200 Ohm, + 5%AlF20

MISCELLANEOUS PARTS

101 4234514-1101 4234514-2102 4233144103 4233051104 4234531105 4234588106 4234595107 4234520108 4234589109 4234591110 4393220-l111 4393220-2114 4234519-1114 4234519-2115 4393206-3116 4393222-l

116 4393222-2

117 4393225-l117 4393225-2

Knob, Joystick (Black)Knob, Joystick (Bright)Insulator, Ground ScrewInsulator, Top CoverInsulator, Audio BoardSeal, JoystickClip, (U103 & U104)Cover, TopHeatsink, Chassis AssemblyClip, (U112)Escutcheon Assembly Blk, Less LensEscutcheon Assembly Brt, Less LensLens, Display, (Infinity)Lens, Display, (Premium)PC Board Assembly, RFPC Board Assembly, Audio/Logic,(Infinity)PC Board Assembly, Audio/Logic,(Premium)PC Board Assembly, ControlPC Board Assembly, Control (SpecialPremium)

NOTE: THE CONTROL PC BOARD ASSEMBLY IS REPAIRABLE.REPLACE BOARD WHEN IT IS PHYSICALLY DAMAGED ONLYONLY

Door 4393271-1 Tape Door KitJl 4233055 Header, Dual, 14 Pin

1-46


REFERENCENUMBER

J201 4393209Pl 4233024PlOlA 4233106PlOlB 4393210P102 4234587P103 4233056-11AP103 4233056-11BP104 4234573P105 4234586P106 4233085P107 4233086LP201 4391426-2LP202 4391426-2LP203 4391426-2LP204 4391426-2LP205 4391426-2LP206 4391426-2s201 4234528S 2 0 2 4234528S203 4234528S204 4234528S205 4234528S206 42345285207 4234528S208 4234528s209 4234528s210 42345285211 4234528s212 4234528S213 4234528

S214 4234528S215 42345285216 4234528S217 4234528S218 4234528s219 4234528s220 42345285221 4234528

PARTNUMBER DESCRIPTION

MISCELLANEOUS

Cable, 21 WiresConnector, AntennaHeader, Right Angle, Brown, 12 PinHeader, Right Angle, White, 9 PinConnector, CD, (Infinity)Connector, Header, 11 Pin (InfinityConnector, Header, 11 Pin (Premium)Connector, Dual Row. 14 PinConnector; Remote, 8 PinCable Assembly, Speaker,Cable Assembly, Power, 7Lamp Assembly w/DiffuserLamp Assembly w/DiffuserLamp Assembly w/DiffuserLamp Assembly w/DiffuserLamp Assembly w/DiffuserLamp Assembly w/DiffuserSwitch, Tuning -Switch, Tuning +Switch, Volume -Switch, Volume +Switch, Memory #2Switch, Memory, #3Switch, Memory #4Switch, Memory, #5Switch, N/RSwitch, AM/FMSwitch, SELECTSwitch, Memory #lSwitch, F/F

SeekSwitch, RWSwitch, EJECTSwitch, SETSwitch, Power, On/OffSwitch, Bass -Switch, Bass +Switch, Treble -Switch, Treble +

7 PinPin

-

l-47

D-

PIN-

123456789

10111213141516171819202122232425262728293031323334353637383940

DC V

4.954.954.954.954.9s4.95000

4.302.504.954.9s4.9s3.703.700

3.901.8000

0.300

4.9s4.954.954.9s0

4.9s1.654.9s0

5.000

3.3000

0.400

4.9sL

U106

PIN

123456789

1011121314

DC V

0.004.9s4.955.004.000.800

5.000

3.505.005.005.005.00

U101

PIN DC ”

1 4.703 5.273 04 4.705 06 07 0I8 09 010 4.70II 0

4.5013 4.95

013 4.714 4.7

-

PIN-

1234S6789

1011121314151617181920-

U102

AMDC V

U107, U108, U109, & U110

00

1.651 . 8 53.854.9s3.801.404.3s0

4.700.500.601.803.402.400.10

010.00

PIN DC V DC V

1 0 . 1 6 3 . 2 02 0.16 3 . 3 03 0 04 0.16 3.205 0 6.006 13.20 13.707 0 08 13.20 13.709 0 6 . 0 0

10 13.30 12.7011 0 9.8512 NC NC13 0.30 1.60

with WithUnswitchedVoltage :EFOnly Unswitched

VoltageApplied

FM IDC V

00

1.651.8513.854.954.901.402.85

04.700.500.601.803.403.402.301.7 - 7.0

010.00 I

U105

PIN DC ”

1 1 . 6 52 03 5.004 5.00S 5.006 5.007 5.008 5.009 0.05

10 5.0011 10.0012 5.0013 5.0014 5.0015 5.0016 5.0017 5.0018 019 5.0020 5.0021 5.0022 5.0023 5.0024 5.0025 5.0026 5.0027 10.0028 1.85

AUDIO/LOGIC PC BOARD ASSEMBLY VOLTAGES

2-3

U100 U101

PIN

123456789

10111213141516171819202122232425262728293031323334353637383940-

DC V

4.954.954.954.954.954.95

000

4.202.504.954.954.953.703.700

2.901.8000

0.300

4.954.954.954.950

4.951.654.950

5.000

3.3000

0.400

4.95

-PIN-

123456789

1011121314-

DC V

0.004.954.955.004.000.800

5.000

3.505.005.005.005.00

U106

PIN-

123455789

1011

12

1314

DC V

4.705.270

4.7000000

4.700

4.504.950

4.14.7

-

PIN-123456789

1011121314151617181920-

"102

AMD C "

00

1.551.853.854.952.801.404.350

4.700.500.601.802.402.400.10

010.00

IPIN 1 1 1 2 13 I

I U111 I 12.7 I 5.0 1 0 I

U107 U108, U109, & U110

PIN DC V DC V

1 0.15 2.202 0.15 2.203 0 04 0.16 2.205 0 6.006 13.20 12.707 0 08 13.20 12.709 0 5.00

10 13.20 12.7011 0 9.8512 NC NC13 0.30 1.60

with WithUnswitched SwitchedVoltage andOnly Unswitched

VoltageApplied

FMDC V

00

1.651.853.854.954.901.402.85

04.700.500.601.802.402.402.301.7 - 7.00

10.00

U105

PIN

12345

;'89

10111213141516171819202122232425252728-

1

1

1.650

5.005.005.005.005.005.000.055.000.005.005.005.005.005.005.000

5.005.005.005.005.005.005.005.000.001.85

AUDIO/LOGIC PC BOARD ASSEMBLY VOLTAGES

2-4

SHINWA CASSETTE TAPE PLAYER

A. LOGIC FUNCTIONS

The mechanism contains logic IC's to interface with the radiodata bus via serial data. All functions are controlled bysoft-touch buttons on the radio escutcheon. The serial data isconverted by IC5 (8-bit serial input/parallel output shiftregister) and IC6 (8-bit serial input/serial output shiftregister), to control the functions which were initiated by theescutcheon buttons. Voltage regulator IClO supplies the Vccvoltage to IC5 and IC6.

B. TAPE DIRECTION

Photocoupled sensors Ul and U2 are comprised of a light-emitterand a photodetector. The reel-bush assemblies on which thespindles are mounted have discs with alternating shiny and darkareas, eight equal sections, on their undersides. As thespindles turn, the discs spin over the photocoupler IC's andthe photodetector alternates between its on/off state as lightis reflected, on/off from the shiny/dark sections on the discs.When the spindles stop, this action ceases and the radiomicrocomputer recognizes this and signals IC5 and IC6 toinitiate a change of direction.

C . AUTOMATIC MUSIC SEARCH

Blank portions of tape between selections are detected by IC2.This function enables a user to quickly skip from one recordedselection to the next in fast-forward or rewind mode by pickingout the end/beginning of one selection and the beginning/end ofthe next. The music search IC (IC2) samples a combined audiooutput from IC7. The value of R28 is chosen to give IC2 asensitivity of -38 db below the reference level of 0 db.Software delays in the radio microcomputer provide optimummusic search performance which compensates for variations intape speed and quality by controlling IC2 and relatedcircuitry.

D. DOLBY NOISE REDUCTION (INFINITY ONLY)

The Dolby@ B-type circuit acts as a frequency-and-level-sensitive cornpander. Noise objectionable to the listener isusually in the 500 Hz to 15 kHz range and IC7 is manufacturedto be effective within this frequency range. The radiomicrocomputer sends a signal to IC7 to activate the noise-reduction circuit when the NR button is pressed on the radio.

3-1

E. SOLENOIDS, (FF, REW & PROGRAM)

When the radio notifies IC3 a high current, NPN Darlingtontransistor array by its input going high, the correspondingoutput will go low. The FF output is pin 11 (Solenoid 315),REW output is pin 12 (Solenoid 316) and the program output(Solenoid 314) is pin 10.

F. MOTOR

Because of the high current required for the motor, a separatetransistor TR3 is used to drive it. Pin 13 of IC3 has to sinkcurrent for the motor to operate.

G. BELT REPLACEMENT

The drive belt is made of carbon-impregnated synthetic rubberand is designed to outlast the mechanism. However, the veryfind particles of carbon in and around the flywheel groovesshould be cleaned periodically to prevent build-ups, which maycause other problems.

H. TAPE PLAYBACK HEAD

The tape deck uses a four-track head in which the two lowertracks are used for forward play and the upper two for reverseplay direction. A mechanically actuated head switch, is usedto switch from forward to reverie play mode.

I. HEAD ALIGNMENT

The alignment of the Head is factory-set using dual-directionalAzimuth adjustment screws. In Forward Play mode, one screw isaccessible from the top of the deck. When tape direction isreversed, another screw automatically becomes accessible.Optimum Frequency Response is achieved by adjusting Headalignment, with precision separately in Forward and ReversePlay modes.

When there is a perceptible change in quality of sound - suchas poor treble response - or high-frequency signal loss duringnormal playback, it is possible that the Azimuth (HeadAlignment) may need adjustment. Before proceeding to adjustthe Azimuth, it is always a good idea to clean the Headthoroughly and check Frequency Response. In many cases oxidedeposits from continuous tape playing are the cause of thecomplaint and proper cleaning solves the problem.

3-2

TABLE 3-1. HEAD ALIGNMENT PROCEDURE

1 STEP1 ACTION I

I I1. Clean the tape head vigorously using a cotton swab dippedin alcohol or a good quality head cleaner.

2.

3.

Using a good quality test tape - 10 kHz or 12.5 kHz -check the Frequency Response in both directions todetermine if the Azimuth needs adjustment. Step 1 mayhave already corrected the problem.

Using a fine star-head, Phillips-type screwdriver,carefully adjust the Azimuth screw for maximum FrequencyResponse on both channels.

4. Activate auto-reverse to access the second Azimuth screwand carefully adjust it for maximum Frequency Response onboth channels.

I 5. I Verify Frequency Response using a good quality test tape.

To ensure that all Frequency Response testing and adjustment isof uniformly good quality, Shinwa recommends the use of high-quality test-tapes like the TEAC MTT series.

Tapes should also be date-stamped and periodically replaced asper manufacturer's recommendations to ensure failsafe results.Adjusting the Azimuth is a precise procedure that should onlybe done when absolutely necessary using only the properequipment and test-media.

J. PREAMPLIFIER

The high-gain stereo preamplifier ICl, in conjunction with therelated external circuitry, provides the initial amplificationof the signal from the playback head. A tape-sensor switch,and a transistor (TR2) are used to automatically select thecorrect equalization of the preamplifier for normal orMetal/CR02 tape. The tape-sensor switch will be closed for anormal tape (+5V) which will turn off TR2. A metal tape willopen the switch and turn on TR2. The tape-sensor switch actionis controlled by using the slots in the industry-standardcassette tapes.

The audio levels of the two channel outputs of the preamp arecontrolled by two easily accessible trim-pots which are factoryadjusted to compensate for differences in pickup level from theplayback head, and to provide the correct output level to theDolby@ noise reduction circuit (IC7).

3-3

J. PREAMPLIFIER (Cont.)

The pots are located just slightly right-of-center on theControl PC Board, as one looks down at the assembly, afterremoving the Cassette Mechanism from the Radio. These pots arefactory-set to 280 millivolts RMS at the Dolby@ test points.

K. PROCEDURE FOR ADJUSTING PREAMPLIFIER OUTPUT LEVELS

Each channel of the tape Preamplifier IC must be adjusted toobtain the correct output signal levels for the left and rightchannels, to compensate for variations in Head pick-up andestablish the Dolby@ specified levels for proper operation ofthe Noise Reduction circuits.

The Dolby@ reference-level test tape -400 Hz, 200namowebers/meter-(TEAC #MMT-150 or equivalent

dis required for

proper Preamplifier adjustment. If a Dolby reference-leveltape is not available, use a standard SRL test tape. Note thatthe Dolby@ test tape is definitely preferred, because itprovides the correct signal reference for setting the gain ofthe Preamplifier.

TABLE 3-2. PREAMPLIFIER ALIGNMENT PROCEDURE

ACTION I

Connect a VTVM/DVM to the left channel audio test pointP103 pin 9. Adjust VR2 to obtain an output of 380 mV RMSon the left channel.

Connect the VTVM/DVM to the right channel audio test pointP103 pin 8. Adjust VRl to obtain an output of 280 mV P.M.5on the right channel.

L. RECOMMENDED TEST AND REPAIR ENVIRONMENT

The TTL IC's used on both Cassette Assemblies are CMOS devices.The sensitivity of these components to electro-static discharge(ESD) has prompted the establishment of more rigorous standardsfor ESD controls wherever the new Radios - and the CassetteMechanism Assemblies used in them - are handled for anypurpose.

Damage caused by ESD is normally catastrophic since it directlyimpacts those very Logic components on which modern electronicsdepends so heavily. Never has prevention been more meaningful,than cure. As a fundamental common-sense requirement, Acustar

3-4

L. RECOMMENDED TEST AND REPAIR ENVIRONMENT (Cont.)

will exnect all Service Centers to install ESD controls priorto attempting to service these new RadiosMechanisms. We have reproduced a drawingspecification for ESD control that may helpyourself suitably.

and/or Cassettefrom an Acustaryou in equipping

FIGURE 3-1. TYPICAL WORK STATION WITH ESD PROTECTION

RECOMMENDED EOUIPMENT

0 Power Supply - 14.0 VDC @ 7.5 Amperes minimum0 AC Voltmeter (high impedance - 10 megohms or more)0 General Purpose Oscilloscope0 Frequency Counter0 Audio Oscillator

M. MECHANISM SEOUENCE OF OPERATION

1. Plav Mode - Load a Cassette Tape into the CassetteHousing (217). It will engage and push against theCatch (251) which will move back. The cassette isdrawn inside by the Reverse SpringFigure 3-2).

(289), (see

3-5

FIGURE 3-2.

The cassette(see Figureunlocked and(234) moves,308/309) are

pushes back the Trigger Plate (232),3-3.) The Eject Plate (234) isslides forward. As the Eject Platethe Leaf Switches (tape-in switchesturned ON, the H/P Roller (250) moves

to the stop position, the H/A Roller (252) movesdown, and the Cassette Housing (217) comes down tomount the Cassette Tape on the Reel Drivers (254).

REVERSE SPRING OPERATION

TOPVIEW

\234

FIGURE 3-3. CASSETTE MOUNTING

3-6

1. Plav Mode (Cont.)

When the tape-in switch is pushed to ON, the Motor(305) starts and the Program-Change Solenoid (314)and FF/REW Solenoid (315 and 316) are allenergized. The Mode Gear (260) then starts turningand the Power Plate (211), Power Arm (208) and ModePlate (209) move to PLAY position, (see Figure 3-4) .

FIGURE 3-4. PLAY MODE

The FF/REW Solenoid Armature is held by Solenoids(315 and 316), and the Head Plate (203) movesforward. The Timing Arm (215) then lifts off theHead Plate Shaft to lock t h e Mode Gear (260), andthe Cassette Tape begins to play. As soon as theMotor starts turning, the Eject Gear (221) alsoturns, and the Stopper Groove of the Eject Gearmoves to the position of the Select Arm Pin (210),(see Figure 3-5). The Select Arm Pin locks theEject Gear (221), and the Chip Arm (212) is held inplace by the Program Solenoid (314). The Mode Gear(260) starts turning, and the Power Plate (211) ismoved by the cam on the gear to PLAY position (seeFigure 3-6). As the Power Plate (211) moves, thePower Arm (208) and the Mode Plate (209) move tothe PLAY position, and the Mode Gear (260) comes toa stop.

3-7

260SIDECAM

FIGURE 3-5. EJECT GEAR FIGURE 3-6. PAUSE MODE

2. Pause Mode (Radio Mode - Power OFF With CassetteLoaded)-In the pause mode, the FF/REW and ProgramSolenoids (314, 315, & 316) and the Motor are allde-energized. As the Mode Plate (209), Power Arm(208), Power Plate (211) move to STOP position, theHead Plate (203) also moves backward to the STOPposition. All movement then comes to a stop.

Program Change Mode - When the Program switch ispushed, the Program Solenoid (314) is de-energizedmomentarily, and the Chip Arm (212) is released.The Reverse Trigger (233) and the Reverse TriggerArm (245) are positioned to unlock the Reverse Gear(220). The Reverse Gear rotates to move theReverse Plate (227), (see Figure 3-7 & 3-8).

3.

FIGURE 3-7.

260 STDP PLAY 211

233 246233 260 227

220

PROGRAM CHARGE FIGURE 3-8. REVERSE GEARMODE ASSEMBLY

Transfer of the Reverse Plate moves Pinch Rollers(206 and 207), Idler Gear (253), and Azimuth Arm(249) for FWD/REV switching, (see Figure 3-9).

3-8

220 227

FIGURE 3-9. FORWARD/REVERSE SWITCHING

4. Auto Reverse Function - As the Cassette Tape inPLAY mode reaches the end of the tape, the ReelGear (222) stops turning. This is detected by thePhoto-- interrupter (312), and the Program Solenoid(314) is then de-energized momentarily for FWD/REVswitching.

5. FF/REW Mode - When the FF or REW switch is pushed,the FF/REW Solenoids (315 and/or 316) are de-energized, the T-Crank (214), FF Crank (248), FFPlate (228), and FF Arm (205) all move to interlockthe FF Gear (219) with Reel Gear (222) for FF orREW of the Cassette Tape, (see Figure 3-10).

SIDEVIEW

BOTTOMVIEW

FIGURE 3-10. FF/REWIND MODE

3-9

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FIGURE 3-13. PARTS LOCATION, SHINWA CASSETTE...presents a high impedance to FM and shortwave...

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