Icom IC-V8 Service Manual

8/8/2019 Icom IC-V8 Service Manual

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iC-v8VHF TRANSCEIVER





TABLE OF CONTENTS

SECTION 1 SPECIFICATIONS

SECTION 2 INSIDE VIEWS

SECTION 3 DISASSEMBLY INSTRUCTIONS

SECTION 4 CIRCUIT DESCRIPTION

4 - 1 RECEIVER CIRCUITS ..........................................................................

4 - 2 TRANSMITTER CIRCUITS ..................................................................

4 - 3 PLL CIRCUIT..........................................................................................

4 - 4 OTHER CIRCUITS ..................................................................................

4 - 5 POWER SUPPLY CIRCUITS ................................................................4 - 6 CPU PORT ALLOCATIONS ..................................................................

SECTION 5 ADJUSTMENT PROCEDURES

5 - 1 PREPARATION................................................................................. .......

5 - 2 PLL ADJUSTMENT.................................................................................

SECTION 6 PARTS LIST

SECTION 7 MECHANICAL PARTS AND DISASSEMBLY

SECTION 8 SEMI-CONDUCTOR INFORMATION

SECTION 9 BOARD LAYOUTS

9 - 1 MAIN UNIT



SECTION 1 SPECIFICATIONS

‘ GENERAL• Frequency coverage :

*Specifications Guaranteed: 144–148 MHz only• Type of emission : F2D/ F3E• Frequency stability : ± 10 ppm

(–10˚C to +60˚C; +14˚F to +140˚F)• Tuning steps : 5, 10, 12.5, 15, 20, 25, 30 or 50 kHz• Antnna connector : BNC (50 Ω )• Power supply requirement : 7.2 V DC (Operable voltage range: 6.0 to 10.3 V)

(negative ground)• Number of memory channel : 100 channels• Call channel : 1 channel• Scanning mode : Program, Memory, Skip, Priority or Tone• Current drain (approx.) : Transmit at High (5.5 W) 2.0 A

at Low (0.5 W) 0.7 AReceive Max. audio 250 mA

stand-by 70 mApower saved 20 mA

• Usable temperature range : –10˚C to +60˚C; +14˚F to +140˚F• Dimensions (projections not included) : 54(W) × 132(H) × 35(D) mm; 2 1 ⁄ 8(W) × 5 3 ⁄ 16 (H• Weight (with ant., BP-222) : 350 g; 12.3 oz.

‘ TRANSMITTER• RF output power (at 7.2 V DC) : 5.5 W / 0.5 W (High / Low)

(with supplied battery pack)• Modulation system : Variable reactance frequency modulation• Maximum frequency deviation : ±5.0 kHz• Spurious emissions : Less than – 60 dB

• Ext. microphone connector : 3-conductor 2.5(d) mm ( 1 ⁄ 10”)/2.2 k Ω

‘ RECEIVER• Receive system : Double conversion superheterodyne system

d f

Receive

136.000 – 174.000 MHz*

Tr

144.000 –

136.000 –

Version

[USA]

[GEN]



SECTION 2 INSIDE VIEWS

Power amplifier(Q1: 2SK3476)

Antenna swtching circuit(D2, D8: MA77)

TOP VIEW BOTTOM VIEW

TX/RX switch(D3, D4: MA77)

APCIC3A: NJM12902VQ37: DTA144EU

FM IF IC(IC2: TA31136FN)

PLL IC(IC1: LV2105V)

IF amplifier(Q14: 2SC4406)

( )



SECTION 3 DISASSEMBLY INSTRUCTIONS

3-1 DISASSEMBLY INSTRUCTION• REMOVING THE CHASSIS PANEL

1 Unscrew 1 nut A , and remove 1 knob B .2 Unscrew 2 screws C .3 Take off the chassis in the direction of the arrow.4 Unplug J6 to separate front panel and chassis.

• REMOVING THE MAIN UNIT12

Unsolder 3 points D , and unscrew 1 nut E .

3Unscrew 2 screws F , 2 screws H , and 6 screws G (silver, 2 mm) to separate the chassis and th

(black, 2 mm) x 2

Front panel

Chassis

J6 (Speaker connector)

B

C

A

H (black, 2 mm) x 2

(silver, 2 mm) x 6

Shield coverG

G

F (black, 2 mm) x 2

Take off the MAIN unit in the direction of the arrow.



3-2 OPTIONAL UNIT INSTALLATIONS1 Remove the option cover.2 Remove the bottom protective paper of spoge.3 Connect the UT-108 optional unit to J5.4 Replace the option cover to the chassis-hole.

SPONGEParts name : 1556 spongeOrder No. : 8930013545

Option cover

Option unit

J5



SECTION 4 CIRCUIT DESCRIPTION

4-1 RECEIVER CIRCUITS4-1-1 ANTENNA SWITCHING CIRCUITReceived signals passed through the low-pass filter (L1, L2,C1 – C5). The filtered signals are applied to the 1/4 λ typeantenna switching circuit (D1, D2, D8, L15, C76).

The antenna swtiching circuit functions as a low-pass filterwhile transmitting. However, its impedance becomes veryhigh while D2 and D8 are turn ON. Thus transmit signals areblocked from entering the receiver circuits. The antennaswitching circuit employs a 1/4 λ type diode swtiching sys-tem. The passed signals are then applied to the RF amplifi-er circuit.

4-1-2 RF CIRCUITThe RF circuit amplifies signals within the range of frequen-cy coverage and filters out-of-band signals.

The signals from the antenna switching circuit are applied tothe limitter (D50), and are then passed through the band-pass filter (D9, L16, C80). The filtered signals are amplifiedat the RF amplifier (Q12), then applied to the 1st mixer cir-cuit after out-of-band signals are suppressed at the band-pass filter (D11, D12, L19, C91 – C97).

D9, D11, D12 employ varactor diodes that track the band-pass filters and are controlled by the T1 – T3 signals from the

D/A convertor (IC10, pins 2, 3, 10). These diodes tune thecenter frequency of an RF passband for wide bandwidthreceiving and good image response rejection.

4-1-3 1ST MIXER AND 1ST IF CIRCUITSThe 1st mixer circuit converts the received signal to a fixedfrequency of the 1st IF signal with a PLL output frequency.By changing the PLL frequency, only the desired frequencywill pass through two crystal filters at the next stage of the1st mixer.

The signals from the RF circuit are mixed at the 1st mixer(Q13) with a 1st LO signal coming from the VCO circuit toproduce a 21.70 MHz 1st IF signal.

The 1st IF signal is applied to suppress out-of-band sigapplied to the IF amplifiermixer circuit (IC1, pin 16).

4-1-4 2ND IF AND DThe 2nd mixer circuit convsignal. A double conversion

converts receive signal twiratio and obtain stable rece

The 1st IF signal from the mixer section of the FM IF the 2nd LO signal to be conal.

The FM IF IC contains the rature detector and active fisignal is produced at the PL

The 2nd IF signal from ththrough a ceramic filter (Fdyned frequencies. It is theer (IC2, pin 5) and appliedpins 10, 11) to demodulate t

4-1-5 AF CIRCUITThe AF amplifier circuit anals to drive a speaker.

AF signals from the FM IFanalog swtich (IC4, pin 1) v6, 7). The output signals frthe low-pass filter (IC3d, pto the analog swtich (IC4, pthe IC4, pin 11 are applied

pin 4) after passing throug12, 11).

2nd IF filter• 2ND IF AND DEMODULATOR CIRCUITS



The AF signals are applied to the AF power amplifier circuit(IC5, pin 4) to obtain the specified audio level. The amplifiedAF signals, output from pin 10, are applied to the internalspeaker (SP1) via the speaker jack (CHASSIS unit; J3)

when no plug is connected to the jack.

4-1-6 SQUELCH CIRCUITA squelch circuit cuts out AF signals when no RF signals arereceived. By detecting noise components in the AF signals,the squelch switches the analog swtich.

A portion of the AF signals from the FM IF IC (IC2, pin 9) areapplied to the active filter section (IC2, pin 8) where noisecomponents are amplified and detected with an internalnoise detector.

The trigger circuit converts the detected signals to a HIGHor LOW signal and applies this (from pin 13) to the CPU(IC8, pin 19) as the NOIS signal. When the CPU receives aHIGH level NOIS signal, the CPU controls the RMUT line tocut the AF signals at the analog swtich IC (IC4). At the sametime, the AFON line controls the AF regulator circuit (Q15,Q16) to cut out the VCC power source for the AF power

amplifier (IC5).

4-2 TRANSMITTER CIRCUITS4-2-1 MICROPHONE AMPLIFIER CIRCUITThe microphone amplifier circuit amplifies audio signals with+6 dB/octave pre-emphasis from the microphone to a levelneeded for the modulation circuit.

The AF signals from the microphone are applied to themicrophone amplifier circuit (IC3c, pin 10). The amplified AFsignals are passed through the low-pass filter circuit (IC3d,pins 13, 14) via the analog swtich (IC4, pins 4, 3). The fil-tered AF signals are applied to the modulator circuit afterpassing through the analog swtich (IC4, pins 8, 9).

4-2-2 MODULATION CIRCUITThe modulation circuit modulates the VCO oscillating signal(RF signal) using the microphone audio signals.

The audio signals (SHIFT) change modulate an oscillated signal at thoscillated signal is amplified at the amplifiers, then applied to the TX/R

4-2-3 DRIVE/POWER AMPLThe signal from the VCO circuit paswtiching circuit (D3) and is amplidrive (Q2) and power (Q1) amplifipower (at 7.2 V DC/typical). Thethrough the low-pass filter (L4, applied to the antenna swtiching capplied to the antenna connector through the low-pass filter (L1, L2,

The bias current of the drive (Q2) ais controlled by the APC circuit to s

4-2-4 APC CIRCUITThe APC (Automatic Power Controtects drive and power amplifiers

and selects HIGH or LOW output p

The output voltage from the powD33) is applied to the differential amthe “T3” signal from the D/A capplied to the other input for refere

When the driving current increasesdifferential amplifier (IC3a, pin 2) cases, the differential amplifier odecreased to reduce the drive curren

Q37 is controlled by the TXC signa55) to select HIGH or LOW output

• APC CIRCUIT



4-3 PLL CIRCUITSA PLL circuit provides stable oscillation of the transmit fre-quency and receive 1st LO frequency. The PLL output com-pares the phase of the divided VCO frequency to the refer-ence frequency. The PLL output frequency is controlled bythe divided ratio (N-data) of a programmable divider.

The PLL circuit contains the VCO circuit (Q50, D38). Theoscillated signal is amplified at the LO (Q6) and buffer (Q5)amplifiers and then applied to the PLL IC (IC1, pin 6).

The PLL IC contains a prescaler, programmable counter,programmable divider, phase detector, charge pump, etc.

The entered signal is divided at the prescaler and program-mable counter section by the N-data ratio from the CPU.The divided signal is detected on phase at the phase detec-tor using the reference frequency.

If the oscillated signal drifts, its phase changes from the ref-erence frequency, causing a lock voltage change to com-pensate for the drift in the oscillated frequency.

A portion of the VCO circuit is amplified at the LO (Q6) and

buffer (Q4) amplifiers and is then applied to the receive 1stmixer or transmit pre-drive amplifier circuit via the TX/RXswtiching diode (D3, D4).

4-4 OTHER CIRCUITS4-4-1 TONE SQUELCH CIRCUITA portion of the detected audio signals from the “DET” line

are passed through the tone filter (Q53). The filtered signalis then applied to the CPU (IC1, pin 94) via the “CTCIN ” sig-nal, and is compared with the programmed tone signal. TheCPU (IC1) outputs control signals as “CTCC ” signal to theAF mute and AF regulator circuits to open the squelch whena matched tone signal is received.

The programmed subaudible tone signal is output from theCPU (IC1, pin 91) directly when transmitting with a tone.

"DEV" ig l f th D/A

Q50, D38

VCO circuitLO

Buffer

Q6 Q4VCO SHIFTR5

Q51, D37

• PLL CIRCUIT

LINE

VCC

CPU5

SW5V

VCO5

PS5

R5

T5

The voltage frCommon 5 V CPU5 regulatapplied to thereset IC (IC11

Common 5 V SW5 regulatorput voltage isVCO5 regulat16), etc.

Common 5 Vthe VCO5 reg(Q6) and buffregulator circufrom the CPU

Common 5 Vthe PS5 regula

switch (IC14, The PS5 reguPS5C line from

5 V for receSW5V line busing the 2nd (Q14) amplificontrolled by pin 53).

5 V for the traSW5V line bythe pre-drive acuit is control(IC8, pin 54).

4-5 POWER SUPPLVOLTAGE LINE



Pin PortDescriptionnumber name

Pin Portnumber name

4-6 PORT ALLOCATIONS4-6-1 CPU (IC8)

1

9

11

12

14

16

17

19

21

23 – 25

26

28 – 30

32 – 35

44 – 47

48

49

50

DICK

RESET

CSIFT

SCK

SO

CLIN

CLOUT

NOIS

S1

OPV1 – OPV3

CONT

V3 – V1

COM4 – COM1

KR3 – KR0

UNLK

RMUT

MMUT

Input port for the clock signal from the[DIAL] (S801).

Input port for reset signal.

Outputs reference oscillator for theCPU control signal.

Outputs serial clock signal to the PLLIC (IC1, pin 2), D/A convertor IC (IC10,

pin 7) and optional unit.Outputs serial signals to the PLL IC(IC1, pin 3), D/A convertor IC (IC10,pin 8) and optional unit.

Input port for the cloning signal.

Outputs the cloning signal.

Input port for noise signals (pulsetype).

Input port for the power switch.Low : While POWER switch is

pushed.

I/O ports for optional unit detectionsignals from/to J5.

Outputs LCD contrast control signal.

Input port for the bias signals for theLCD.

Outputs LCD common signals.

Input port for initial matrix.Low : While keys are pushing.

Input port for PLL unlock signal fromthe PLL IC (IC1, pin 14).Low : During lock.

• Outputs RX mute control signal.• Input port for the RX mute signalfrom the optional unit.

• Outputs TX mute control signal.• Input port for the TX mute signal

from the optional unit.

56

57

58

59

60

61

62

63

64 – 87

90

91

94

95

96

97

98

99

Outputs cocircuit of AHigh : W

Outputs LHigh : L

Outputs Esignal.

I/O port foEEPROM

I/O port foD/A conve

Outputs st(IC1, pin 4

Outputs Vsignal.Low : W

Outputs Psignal.Low : W

Output LC

Outputs Cnal.

Outputs Dtone signa

Input pordecoded si

Input port High : W

Input portfrom the [

Input port an optionathe [MIC]

Input port

Input port

AFON

LIGT

ESCK

ESDA

DAST

PLST

PSVCO

PS5C

SEG1 – SEG23

CTCC

TONE

CTCIN

PTT

DIUD

REMO

SD

LVIN



Pin PortDescriptionnumber name

2, 3

10

11

14

15

22

23

T1, T2

T3

VOLOUT

DTC

FC

DEV

SQLIN

Output tunable bandpass filter controlsignals.

• Outputs tunable bandpass filter con-trol signal while receiving.

• Outputs TX power control signalwhile transmitting.

Outputs AF volume control signal.

Outputs DTCS ’s gradient control sig-nal.

Outputs reference frequency controlsignal to X1.

Outputs transmit devetion control sig-nal.

Outputs squelch control signal.

4-6-2 D/A CONVERTOR IC (IC10)





5-2 PLL ADJUSTMENT

PLL LOCKVOLTAGE

1 • Operating frequency :145.000 MHz

• Receiving

MAIN Connect a digital multimeter to check pointLV.

ADJUSTMENT ADJUSTMENT CONDITIONS

UNIT LOCATION

MEASUREMENT

L33PLL lock voltageadjustment

LV



IC1 1130008350 S.IC LV2105V-TLMIC2 1110003490 S.IC TA31136FN (D,EL)IC3 1110005340 S.IC NJM12902V-TE1IC4 1130008090 S.IC BU4066BCFV-E1IC5 1110001810 S.IC TA7368F (TP1)IC7 1130010490 S.IC BR24C16FV-E2IC8 1140009920 S.IC HD6433876B49HIC10 1190000350 S.IC M62363FP-650C

IC11 1130009110 S.IC S-80942ANMP-DD6-T2IC12 1180000800 S.IC S-81350HG-KD-T1

Q1 1560001150 S.FET 2SK3476 (TE12L)Q2 1560001160 S.FET 2SK3475 (TE12L)Q3 1530003230 S.TRANSISTOR 2SC5085-Y (TE85R)Q4 1530003220 S.TRANSISTOR 2SC4406-4-TLQ5 1530003220 S.TRANSISTOR 2SC4406-4-TLQ6 1530003220 S.TRANSISTOR 2SC4406-4-TLQ11 1590001650 S.TRANSISTOR XP4601 (TX)Q12 1580000710 S.FET 3SK274 (TE85R)Q13 1580000710 S.FET 3SK274 (TE85R)Q14 1530003220 S.TRANSISTOR 2SC4406-4-TLQ15 1520000450 S.TRANSISTOR 2SB1132 T100 QQ16 1590001190 S.TRANSISTOR XP6501-(TX) .ABQ17 1590001920 S.TRANSISTOR UN911F (TX)Q21 1510000510 S.TRANSISTOR 2SA1576AT106RQ22 1510000510 S.TRANSISTOR 2SA1576AT106RQ25 1530002690 S.TRANSISTOR 2SC4116-GR (TE85R)Q31 1590000660 S.TRANSISTOR DTC144TU T107Q34 1560000810 S.FET 2SK1069-4-TLQ37 1590000720 S.TRANSISTOR DTA144EUA T106Q38 1590000430 S.TRANSISTOR DTC144EUA T106Q43 1590000430 S.TRANSISTOR DTC144EUA T106Q50 1590001530 S.TRANSISTOR UMX5 TLQ51 1590000430 S.TRANSISTOR DTC144EUA T106Q53 1590001650 S.TRANSISTOR XP4601 (TX)Q54 1510000510 S.TRANSISTOR 2SA1576AT106RQ55 1520000450 S.TRANSISTOR 2SB1132 T100 QQ56 1590001470 S.TRANSISTOR UN9213 (TX)Q57 1590001170 S.TRANSISTOR XP1501-(TX) .ABQ58 1590001650 S.TRANSISTOR XP4601 (TX)Q59 1530002690 S.TRANSISTOR 2SC4116-GR (TE85R)

D1 1790000620 S.DIODE MA77 (TX)

D2 1790000620 S.DIODE MA77 (TX)D3 1790000620 S.DIODE MA77 (TX)D4 1790000620 S.DIODE MA77 (TX)D7 1750000770 S.VARICAP HVC376BTRFD8 1790000620 S.DIODE MA77 (TX)D9 1720000780 S.VARICAP HVU350B TRFD11 1720000780 S.VARICAP HVU350B TRFD12 1720000780 S.VARICAP HVU350B TRFD27 1790001670 S.DIODE RB706F-40T106

X1 6050010800 S.XTAL CRX2 6050010870 S.XTAL CRX3 6070000210 S.DISCRIMINATOR

L1 6200008260 S.COIL 0.3L2 6200008280 S.COIL 0.3L4 6200008280 S.COIL 0.3

L5 6200008250 S.COIL 0.3L6 6200007710 S.COIL LQL7 6200005260 S.COIL LLL8 6200006980 S.COIL ELL14 6200007000 S.COIL ELL15 6200008170 S.COIL 0.3L16 6200008260 S.COIL 0.3L18 6200008090 S.COIL LQL19 6200002380 S.COIL LQL20 6200003280 S.COIL NLL21 6200005740 S.COIL ELL24 6200003090 S.COIL NLL26 6200003590 S.COIL EXL29 6200006670 S.COIL ELL32 6200008700 S.COIL 0.3L33 6130002480 S.COIL LBL34 6200003710 S.COIL NLL36 6200004920 S.COIL ML

R1 7030003670 S.RESISTOR ERJR2 7030003480 S.RESISTOR ERJR3 7030003480 S.RESISTOR ERJR5 7030003240 S.RESISTOR ERJR7 7030003360 S.RESISTOR ERJR10 7030003260 S.RESISTOR ERJ3R11 7030003500 S.RESISTOR ERJ3R12 7030003500 S.RESISTOR ERJ3R13 7030003260 S.RESISTOR ERJ3R14 7030003520 S.RESISTOR ERJ3R15 7030003320 S.RESISTOR ERJ3R16 7030003220 S.RESISTOR ERJ3R17 7030003440 S.RESISTOR ERJ3R18 7030003630 S.RESISTOR ERJ3R19 7030003380 S.RESISTOR ERJ3R20 7030003710 S.RESISTOR ERJ3R21 7030003440 S.RESISTOR ERJ3

R22 7030003660 S.RESISTOR ERJ3R23 7030003420 S.RESISTOR ERJ3R30 7030003520 S.RESISTOR ERJ3R32 7030003390 S.RESISTOR ERJ3R33 7030003380 S.RESISTOR ERJ3R35 7030003320 S.RESISTOR ERJ3R41 7030003320 S.RESISTOR ERJ3R44 7030003560 S.RESISTOR ERJ3R48 7030003560 S.RESISTOR ERJ3

REF ORDER DESCRIPTIONNO. NO.

[MAIN UNIT]REF ORDERNO. NO.

[MAIN UNIT]

SECTION 6 PARTS LIST



R81 7030003400 S.RESISTOR ERJ3GEYJ 471 V (470 Ω )

R82 7030003470 S.RESISTOR ERJ3GEYJ 182 V (1.8 kΩ

)R83 7030003400 S.RESISTOR ERJ3GEYJ 471 V (470 Ω )R84 7030003390 S.RESISTOR ERJ3GEYJ 391 V (390 Ω )R85 7030003460 S.RESISTOR ERJ3GEYJ 152 V (1.5 k Ω )R86 7030003640 S.RESISTOR ERJ3GEYJ 473 V (47 k Ω )R87 7030003480 S.RESISTOR ERJ3GEYJ 222 V (2.2 k Ω )R88 7030003620 S.RESISTOR ERJ3GEYJ 333 V (33 k Ω )R93 7030003610 S.RESISTOR ERJ3GEYJ 273 V (27 k Ω )R94 7030003800 S.RESISTOR ERJ3GEYJ 105 V (1 M Ω )R95 7030003820 S.RESISTOR ERJ3GEYJ 155 V (1.5 M Ω )R97 7030003720 S.RESISTOR ERJ3GEYJ 224 V (220 k Ω )R98 7030003740 S.RESISTOR ERJ3GEYJ 334 V (330 k Ω )R99 7030003690 S.RESISTOR ERJ3GEYJ 124 V (120 k Ω )R100 7030003590 S.RESISTOR ERJ3GEYJ 183 V (18 k Ω )R101 7030003800 S.RESISTOR ERJ3GEYJ 105 V (1 M Ω )R102 7030003200 S.RESISTOR ERJ3GEYJ 100 V (10 Ω )R103 7030003570 S.RESISTOR ERJ3GEYJ 123 V (12 k Ω )R104 7030003680 S.RESISTOR ERJ3GEYJ 104 V (100 k Ω )R105 7030003400 S.RESISTOR ERJ3GEYJ 471 V (470 Ω )R107 7030003700 S.RESISTOR ERJ3GEYJ 154 V (150 k Ω )R108 7030003700 S.RESISTOR ERJ3GEYJ 154 V (150 k Ω )R112 7030003800 S.RESISTOR ERJ3GEYJ 105 V (1 M Ω )R113 7030003660 S.RESISTOR ERJ3GEYJ 683 V (68 k Ω )R114 7030003590 S.RESISTOR ERJ3GEYJ 183 V (18 k Ω )R115 7030003690 S.RESISTOR ERJ3GEYJ 124 V (120 k Ω )

R117 7030003460 S.RESISTOR ERJ3GEYJ 152 V (1.5 kΩ

)R120 7030003640 S.RESISTOR ERJ3GEYJ 473 V (47 k Ω )R121 7030003440 S.RESISTOR ERJ3GEYJ 102 V (1 k Ω )R122 7030003490 S.RESISTOR ERJ3GEYJ 272 V (2.7 k Ω )R123 7030003540 S.RESISTOR ERJ3GEYJ 682 V (6.8 k Ω )R126 7030003640 S.RESISTOR ERJ3GEYJ 473 V (47 k Ω )R127 7030003260 S.RESISTOR ERJ3GEYJ 330 V (33 Ω )R128 7030003200 S.RESISTOR ERJ3GEYJ 100 V (10 Ω )R130 7030003680 S.RESISTOR ERJ3GEYJ 104 V (100 k Ω )R131 7030003400 S.RESISTOR ERJ3GEYJ 471 V (470 Ω )R132 7030003400 S.RESISTOR ERJ3GEYJ 471 V (470 Ω )R136 7030003320 S.RESISTOR ERJ3GEYJ 101 V (100 Ω )R137 7030003320 S.RESISTOR ERJ3GEYJ 101 V (100 Ω )R139 7030003560 S.RESISTOR ERJ3GEYJ 103 V (10 k Ω )R141 7030003520 S.RESISTOR ERJ3GEYJ 472 V (4.7 k Ω )R144 7030003600 S.RESISTOR ERJ3GEYJ 223 V (22 k Ω )R145 7030003760 S.RESISTOR ERJ3GEYJ 474 V (470 k Ω )R148 7030003680 S.RESISTOR ERJ3GEYJ 104 V (100 k Ω )R150 7030003400 S.RESISTOR ERJ3GEYJ 471 V (470 Ω )R155 7030003320 S.RESISTOR ERJ3GEYJ 101 V (100 Ω )R159 7030003680 S.RESISTOR ERJ3GEYJ 104 V (100 k Ω )R160 7030003340 S.RESISTOR ERJ3GEYJ 151 V (150 Ω )R161 7030003600 S.RESISTOR ERJ3GEYJ 223 V (22 k Ω )R162 7030003600 S.RESISTOR ERJ3GEYJ 223 V (22 k Ω )R163 7030003480 S.RESISTOR ERJ3GEYJ 222 V (2.2 k Ω )

R164 7030003680 S.RESISTOR ERJ3GEYJ 104 V (100 k Ω )R169 7030003630 S.RESISTOR ERJ3GEYJ 393 V (39 k Ω )R170 7030003560 S.RESISTOR ERJ3GEYJ 103 V (10 k Ω )R174 7030003580 S.RESISTOR ERJ3GEYJ 153 V (15 k Ω )R176 7030003510 S.RESISTOR ERJ3GEYJ 392 V (3.9 k Ω )R177 7030003440 S.RESISTOR ERJ3GEYJ 102 V (1 k Ω )R178 7030003630 S.RESISTOR ERJ3GEYJ 393 V (39 k Ω )R181 7030003940 S.RESISTOR ERJ3GEYF 104 V (100 k Ω )R182 7510001280 S.THERMISTOR NTCCM20124AG473J-T

R238 7410000950 S.ARRAY

R239 7030003440 S.RESISTORR240 7030003440 S.RESISTORR241 7030003800 S.RESISTORR242 7030003800 S.RESISTORR243 7030003800 S.RESISTORR244 7030003680 S.RESISTORR245 7030003680 S.RESISTORR246 7030003680 S.RESISTORR251 7030003740 S.RESISTORR252 7030003560 S.RESISTORR257 7030004050 S.RESISTORR259 7030003560 S.RESISTORR260 7030003560 S.RESISTORR261 7030003640 S.RESISTORR262 7030003420 S.RESISTORR264 7030003660 S.RESISTORR266 7030003580 S.RESISTORR300 7030003560 S.RESISTORR301 7030003420 S.RESISTORR302 7030003560 S.RESISTORR303 7030003360 S.RESISTORR304 7030003360 S.RESISTORR305 7030003320 S.RESISTORR306 7030003380 S.RESISTORR307 7030003390 S.RESISTOR

R308 7030003640 S.RESISTORR309 7030003550 S.RESISTORR310 7030003640 S.RESISTORR311 7030003640 S.RESISTORR313 7030003440 S.RESISTORR314 7030003520 S.RESISTORR315 7030003550 S.RESISTORR316 7030003520 S.RESISTORR318 7030003660 S.RESISTORR319 7030003660 S.RESISTORR320 7030003580 S.RESISTORR321 7030003560 S.RESISTORR323 7030003560 S.RESISTORR324 7030003450 S.RESISTORR325 7030003660 S.RESISTORR326 7030003660 S.RESISTORR327 7030003680 S.RESISTORR328 7030003680 S.RESISTORR329 7030003640 S.RESISTORR330 7030003560 S.RESISTORR331 7030003560 S.RESISTORR332 7030003520 S.RESISTORR333 7030003800 S.RESISTORR334 7030003800 S.RESISTORR335 7030003800 S.RESISTOR

R336 7030003680 S.RESISTORR337 7030003830 S.RESISTORR340 7030003600 S.RESISTORR341 7030003620 S.RESISTORR346 7030003680 S.RESISTORR348 7030003440 S.RESISTORR349 7030003680 S.RESISTOR

R350 7030003800 S.RESISTOR



[MAIN UNIT]



C13 4030006860 S.CERAMIC C1608 JB 1H 102K-T-A

C14 4030006900 S.CERAMIC C1608 JB 1E 103K-T-AC15 4030007150 S.CERAMIC C1608 CH 1H 151J-T-AC17 4030006860 S.CERAMIC C1608 JB 1H 102K-T-AC18 4030006860 S.CERAMIC C1608 JB 1H 102K-T-AC19 4030006900 S.CERAMIC C1608 JB 1E 103K-T-AC20 4030006860 S.CERAMIC C1608 JB 1H 102K-T-AC21 4550006480 S.TANTALUM TEMSVA 1C 475M-8LC22 4030007130 S.CERAMIC C1608 CH 1H 101J-T-AC23 4030006860 S.CERAMIC C1608 JB 1H 102K-T-AC24 4030006860 S.CERAMIC C1608 JB 1H 102K-T-AC25 4030006860 S.CERAMIC C1608 JB 1H 102K-T-AC26 4030006860 S.CERAMIC C1608 JB 1H 102K-T-AC27 4030007040 S.CERAMIC C1608 CH 1H 180J-T-AC28 4030007020 S.CERAMIC C1608 CH 1H 120J-T-AC29 4030006860 S.CERAMIC C1608 JB 1H 102K-T-AC30 4030007050 S.CERAMIC C1608 CH 1H 220J-T-AC31 4030006960 S.CERAMIC C1608 CH 1H 050C-T-AC32 4030006860 S.CERAMIC C1608 JB 1H 102K-T-AC33 4030006860 S.CERAMIC C1608 JB 1H 102K-T-AC47 4550006260 S.TANTALUM TESVSP 1C 474M-8RC48 4550005980 S.TANTALUM TEMSVA 1A 475M-8LC50 4550003080 S.TANTALUM TEMSVA 1A 335M-8LC52 4030007030 S.CERAMIC C1608 CH 1H 150J-T-AC54 4030006860 S.CERAMIC C1608 JB 1H 102K-T-AC55 4030006900 S.CERAMIC C1608 JB 1E 103K-T-A

C60 4030006860 S.CERAMIC C1608 JB 1H 102K-T-AC61 4030007020 S.CERAMIC C1608 CH 1H 120J-T-AC62 4030007000 S.CERAMIC C1608 CH 1H 090D-T-AC64 4030006990 S.CERAMIC C1608 CH 1H 080D-T-AC69 4030007110 S.CERAMIC C1608 CH 1H 680J-T-AC70 4030006860 S.CERAMIC C1608 JB 1H 102K-T-AC72 4550000460 S.TANTALUM TESVA 1C 105M1-8LC73 4030011600 S.CERAMIC C1608 JB 1C 104KT-NC75 4030011600 S.CERAMIC C1608 JB 1C 104KT-NC76 4030007040 S.CERAMIC C1608 CH 1H 180J-T-AC79 4030006960 S.CERAMIC C1608 CH 1H 050C-T-AC80 4030009510 S.CERAMIC C1608 CH 1H 010B-T-AC81 4030007130 S.CERAMIC C1608 CH 1H 101J-T-AC82 4030006860 S.CERAMIC C1608 JB 1H 102K-T-AC87 4030006900 S.CERAMIC C1608 JB 1E 103K-T-AC88 4030006860 S.CERAMIC C1608 JB 1H 102K-T-AC89 4030006860 S.CERAMIC C1608 JB 1H 102K-T-AC90 4030006860 S.CERAMIC C1608 JB 1H 102K-T-AC91 4030006930 S.CERAMIC C1608 CH 1H 020C-T-AC92 4030007130 S.CERAMIC C1608 CH 1H 101J-T-AC93 4030006860 S.CERAMIC C1608 JB 1H 102K-T-AC94 4030009500 S.CERAMIC C1608 CH 1H 0R5B-T-AC95 4030006860 S.CERAMIC C1608 JB 1H 102K-T-AC96 4030007130 S.CERAMIC C1608 CH 1H 101J-T-AC97 4030006960 S.CERAMIC C1608 CH 1H 050C-T-A

C98 4030006960 S.CERAMIC C1608 CH 1H 050C-T-AC99 4030006860 S.CERAMIC C1608 JB 1H 102K-T-AC100 4030007080 S.CERAMIC C1608 CH 1H 390J-T-AC101 4030007100 S.CERAMIC C1608 CH 1H 560J-T-AC102 4030007100 S.CERAMIC C1608 CH 1H 560J-T-AC104 4030006860 S.CERAMIC C1608 JB 1H 102K-T-AC105 4030006900 S.CERAMIC C1608 JB 1E 103K-T-AC106 4030007050 S.CERAMIC C1608 CH 1H 220J-T-AC107 4030006860 S.CERAMIC C1608 JB 1H 102K-T-A

C133 4030011600 S.CERAMIC C16

C134 4030007170 S.CERAMIC C16C135 4030011280 S.CERAMIC C16C136 4030008770 S.CERAMIC C16C137 4030008900 S.CERAMIC C16C138 4030006860 S.CERAMIC C16C139 4030008680 S.CERAMIC C20C140 4030011600 S.CERAMIC C16C144 4030006860 S.CERAMIC C16C145 4510004630 S.ELECTROLYTICC147 4030008920 S.CERAMIC C16C149 4030008880 S.CERAMIC C16C150 4550006050 S.TANTALUM TEC151 4030007090 S.CERAMIC C16C152 4030008920 S.CERAMIC C16C153 4510006940 S.ELECTROLYTICC154 4550006250 S.TANTALUM TEC161 4030006900 S.CERAMIC C16C162 4030006900 S.CERAMIC C16C163 4030006860 S.CERAMIC C16C164 4030006860 S.CERAMIC C16C165 4030006860 S.CERAMIC C16C166 4030006860 S.CERAMIC C16C167 4030007090 S.CERAMIC C16C168 4030006860 S.CERAMIC C16C169 4030006860 S.CERAMIC C16

C171 4030011600 S.CERAMIC C16C173 4510006220 S.ELECTROLYTICC174 4510005430 S.ELECTROLYTICC179 4030006900 S.CERAMIC C16C193 4030006990 S.CERAMIC C16C194 4030007030 S.CERAMIC C16C195 4030007100 S.CERAMIC C16C197 4030011600 S.CERAMIC C16C199 4030011600 S.CERAMIC C16C204 4030006860 S.CERAMIC C16C205 4030006860 S.CERAMIC C16C209 4030011600 S.CERAMIC C16C212 4030006900 S.CERAMIC C16C213 4550002890 S.TANTALUM TEC214 4030008900 S.CERAMIC C16C216 4030008920 S.CERAMIC C16C217 4030011600 S.CERAMIC C16C219 4030006900 S.CERAMIC C16C223 4030006900 S.CERAMIC C16C230 4030008890 S.CERAMIC C16C232 4030008630 S.CERAMIC C16C233 4030006860 S.CERAMIC C16C234 4030006860 S.CERAMIC C16C236 4030006900 S.CERAMIC C16C243 4030006860 S.CERAMIC C16

C244 4030006900 S.CERAMIC C16C245 4030006900 S.CERAMIC C16C249 4030006900 S.CERAMIC C16C251 4030006860 S.CERAMIC C16C252 4030006860 S.CERAMIC C16C277 4030006970 S.CERAMIC C16C278 4030007050 S.CERAMIC C16C281 4030006860 S.CERAMIC C16C282 4030006860 S.CERAMIC C16



[MAIN UNIT]



C361 4030006860 S.CERAMIC C1608 JB 1H 102K-T-AC363 4030006860 S.CERAMIC C1608 JB 1H 102K-T-AC364 4030007060 S.CERAMIC C1608 CH 1H 270J-T-AC365 4030009560 S.CERAMIC C1608 CH 1H R75B-T-AC367 4030009500 S.CERAMIC C1608 CH 1H 0R5B-T-AC368 4030009500 S.CERAMIC C1608 CH 1H 0R5B-T-AC369 4030008900 S.CERAMIC C1608 JB 1C 333K-T-AC370 4030009970 S.CERAMIC C1608 JB 1H 182K-T-AC372 4030008880 S.CERAMIC C1608 JB 1C 223K-T-AC373 4030009880 S.CERAMIC C1608 JB 1H 682K-T-AC374 4030006870 S.CERAMIC C1608 JB 1H 222K-T-AC375 4030006860 S.CERAMIC C1608 JB 1H 102K-T-AC376 4030006860 S.CERAMIC C1608 JB 1H 102K-T-AC377 4550006350 S.TANTALUM TEMSVB2 1A 226M-8LC378 4030011600 S.CERAMIC C1608 JB 1C 104KT-NC379 4030006860 S.CERAMIC C1608 JB 1H 102K-T-AC380 4510005430 S.ELECTROLYTIC ECEV0JA220SRC381 4550006250 S.TANTALUM TEMSVA 1A 106M-8LC385 4030011600 S.CERAMIC C1608 JB 1C 104KT-NC386 4030007050 S.CERAMIC C1608 CH 1H 220J-T-AC387 4030007090 S.CERAMIC C1608 CH 1H 470J-T-AC388 4030007050 S.CERAMIC C1608 CH 1H 220J-T-AC389 4030006860 S.CERAMIC C1608 JB 1H 102K-T-AC390 4030007060 S.CERAMIC C1608 CH 1H 270J-T-AC391 4030007050 S.CERAMIC C1608 CH 1H 220J-T-AC392 4550006250 S.TANTALUM TEMSVA 1A 106M-8L

C393 4550006760 S.TANTALUM TEMSVB2 1A 336M-8RC394 4030011600 S.CERAMIC C1608 JB 1C 104KT-NC395 4030007040 S.CERAMIC C1608 CH 1H 180J-T-AC396 4030007070 S.CERAMIC C1608 CH 1H 330J-T-AC397 4030006950 S.CERAMIC C1608 CH 1H 040C-T-AC398 4550005980 S.TANTALUM TEMSVA 1A 475M-8LC399 4030008650 S.CERAMIC C1608 JB 1H 332K-T-AC400 4030006870 S.CERAMIC C1608 JB 1H 222K-T-A

J2 6450001680 CONNECTOR HSJ1122-010010J3 6450001690 CONNECTOR HSJ1456-01-220J5 6510018430 S.CONNECTOR AXN330C038PJ6 6510021900 S.CONNECTOR BM02B-ASRS-TF

DS1 5030002000 LCD TTR5515 UPFDHWDS2 5010000160 S.LED LNJ310M6URADS3 5010000160 S.LED LNJ310M6URA

MC1 7700002160 MICROPHON KUC3523-040245

S1 2230001070 S.SWITCH JPM1990-2711R

S2 2230001070 S.SWITCH JPM1990-2711RS3 2230001070 S.SWITCH JPM1990-2711RS801 7600000210 ENCODER TP70N00E20-15F-1903

W7 7030003860 S.JUMPER ERJ3GE JPW VW8 7030003860 S.JUMPER ERJ3GE JPW VW9 7030003860 S.JUMPER ERJ3GE JPW VW11 7030003860 S.JUMPER ERJ3GE JPW V


[MAIN UNIT]



SECTION 7 MECHANICAL PARTS AND DISASS

REF. NO. ODER NO. DESCRIPTION QTY.

MP1 8210017981 2251 T-front panel (B)-1 1

J1 6510022460 1

1MP2 8930050890 2251 terminal holderMP3 8010017990 2251 chassis 1MP4 8210016570 2251 rear panel 1MP5 8930050870 2251 release button 1

MP7 8310051450 2251 window plate 1MP8 8930051350 2251 jack rubber 1MP9 8210016550 2251 jack panel 1MP10 8610011080 Knob N-287 1MP13 8930055520 2251 10key 1MP14 8930050840 2251 minus terminal 1MP15 8930050850 2251 plus terminal 1MP20 8930042350 1922 mic sheet 1MP21 8930051300 2251 mic sponge 1MP22 8930051290 2251 opt sheet 1MP23 8830001340 1903 hex nut 1

MP24 8930050900 2251 window sheet 1MP25 8930036751 Spring 1

Ant connector- BNC-R162

MP27 8830001250 Ant connector-101 1MP31 8810009510 Screw BT M2 x 4 NI-ZU 8MP32 8810009560 Screw BT M2 x 6 ZK 7MP33 8810000100 Screw M2 x 4 ZK 4MP37 8930050800 2251 jack cap 1MP39 8860001210 2251 ANT rug 1MP41 8510013570 2422 shield plate 1

[CHASSIS PARTS]


1

EP2 8930051310 LCD contact SRCN-2251-SP-N-W

1

1

DS1 8930051310 LCD TTR-5515

MP1 8510011111 1922 VCO case-1MP2 8510011101 1922 VCO cover-1 1MP3 8930050811 2251 LCD holder-1 1MP4 8210016580 2251 reflector 1MP5 8410002410 2468 PA heatsink 1

[MAIN UNIT]

REF. NO. ODER NO.

EP1 3310002840 Antenna FA-BEP2 0880000840 Battery BP-20

MP1 8930042040 1922 Belt clipMP2 8930051290 2251 OPT sh

[ACCESSORIES]

EP1

EP2

MP1

SP1 2510001120 Speaker SDRS-3650P-008 1



7 - 2

UNIT abbreviation (C): CHASSIS PARTS, (M): MAIN UNIT

MP4 (M)

MP7 (C)

MP1 (C)

MP20 (C)

MP37 (C)

MP21 (C)

MP3 (M)

DS1 (M)EP2 (M)

MP13 (C)

MP27 (C)

MP10 (C)

SP1 (C)

MP31 (C)

MP32 (C)

MP31 (C)

MP41 (C)

MP24 (C)



SECTION PARTS LISTSECTION 8 SEMI-CONDUCTOR INFORMATION

8 - 1 TRANSISTORS AND FETS

3SK274 UN

G2

S

G1

D

2SK1069 4 FJ

G

S D

2SK3476 TUCF

S

G D

B E

C

E1B 2 B 1

C1C 2 E 2

XP6501 AB 5N

B1

E1

C2 C1

B2 E213

64

C1 C2

EB1 B2

DTA144EU 16UN911F 6O

B E

C

XP4601 5C

E1

B2

B1

C1

C2

E2

NAME SYMBOL INSIDE VIEWNAME SYMBOL INSIDE VIEW

2SB1132 Q BAQ

B E

C

C

2SK3475 WB

G S D

S

2SA1576 R FR

C

B E

2SC4116 GR LG2SC4406 4 JT2SC5085 Y MCY

B E

C

DTC144EU 26UN9213 8C

B E

C

DTC144TU 06

UMX5 X5

XP1501 AB 5R



9 - 1

9 - 1 MAIN UNIT

SECTION 9 BOARD LAYOUTS

(TOP VIEW)



MICROPHONE

EUP

DN

(BOTTOM VIEW)



SECTION 10 BC-146 OPTIONAL DESKTOP CHARGER INF


MP1 8010018620 2447 case (A) 1MP2 8110007450 2447 cover 1MP3 8930039620 Leg cushion (A) 4MP4 8930055020 2480 spacer 1MP5 8930055030 2480 BC-spacer 1MP6 8810008660 Screw B0 M 3 x 8 NI-ZU (BT) 1

[CHASSIS UNIT]

10-1 PARTS LIST 10-2 DISASSEMBLY

MP1

MP2

MP5

MP3

MP3

A

A

A

A

A


[CHARGE UNIT]

R1 7010007550 RESISTOR ERG3SJ680H 1R2 7010007100 RESISTOR PSD1/4V 1 k Ω 1 J1 6510021470 CONNECTOR HEC0470-01-230 1

DS1 5040001390 LED TLG124A 1

EP1 0910053820 PCB B 5650 1

MP1 8930051340 2338 TERMINAL 1MP2 8930051340 2338 TERMINAL 1

Screw abbreviations B0, BT:Self-tappingNI-ZU :Nickel-Zinc



10-3 VOLTAGE DIAGRAM

10-4 BOARD LAYOUT

R1 68

J1HEC0470-01-230

R21k

DS1TLG124A

C : 13.8VN : 13.8V

C : 7.2VN : 13.8V

C : 9.2VN : 13.8V

J1

HD



11 - 1

SECTION 11 BLOCK DIAGRAM

Q6: 2S

R5

Q50: UMX5

VCO

D38: HVU350B

Q51: DTC144EUD37: MA2S077

VCOSHIFTQ59: 2SC4116

REF.OSC

IC1: LV2105V

X1: CR-65921.250 MHz

FRQCONOPTIONALUNIT

J5

MIC, AF, PTT

S801

TP70N00E2015

DICK

DIUD

DTC

DTC

21.250 MHz

DEV

F C

FC

D7:HVC376B

REF.ADJ.

X3: CDBCA450CX24

Q58:XP4601

LOOPSW

Q5: 2SC44

Q34: 2SK

S D

N O I S

Q1IC2: TA31136FN

MIX, NOISE AMPIF AMP, FM DETS DET, OSCSQL SW, AF FIL

C T C S S

D E T

DET

L P F O U T

SQLIN

SW5V

IC10 (5, 6, 7, 8)M62363FP

FI2: SFPC450E

PTT

PTTSELECT

D

PTTCONT

MC1: KUC3523

Q17: UN911F

PTT

OPT

MIC

J2: HSJ1122MIC JACK

SW5V

VCCSELECTOPTION

F

450 kHz

AF1

IC3B:NJM12902

MICAMP

R M U T

ANALOG S

MOD1

MOD3

ENPHAPRE

IC3C: NJM12902C

IC5: TA7368F

MICSELECT

Q15: 2SB1132Q16: XP6501 AF

REG

IC10 (4): M62363FP

AFONJ3: HSJ1456SP JACK

SP1: SDRS-3650P

CHASSIS UNIT

CLONE

SPAFOUT

T5

Q22: 2SA1576

T5REG

T 5 C

Q31: DTC144TUD27: RB706F

R5 PS5

Q21: 2SA1576

R5REG

Q54: 2SA1576

PS5REG

P S 5 C

R 5 C

SW5VVCO5

Q11: XP4601

VCO5REG

P S V C O

Q56: UN9213

SW5CONT

PCON

Q55: 2SB1132Q57: XP1501

SW5REG

D39: MA2S111IC12: S-81350

CPU5

REGBATT

GND

VCC

D/A

UPE

DN

MIC

PLLIC

LOOPFIL

LPF

CERAMICBPF

AFAMP

BUFF

D/A

HPF

HPF

MAIN UN









Count on us!



S-13802MZ-C1 © 2001 Icom Inc.1-1-32, Kamiminami, Hirano-ku, Osaka 547-0003, Japan

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