SERVICE MANUAL
MICROFILM
Amplifier sectionThe following measured at AC 120/220/240 V,50/60 HzFront Speaker:DIN power output (rated) 95 + 95 watts
(6 ohms at 1 kHz, DIN)Continuous RMS power output (reference)
120 + 120 watts(6 ohms at 1 kHz,10% THD)
Centre Speaker:DIN power output (rated) 25 watts
(8 ohms at 1 kHz, DIN)Continuous RMS power output (reference)
35 watts(8 ohms at 1 kHz,10% THD)
Rear Speaker:DIN power output (rated) 25 + 25 watts
(8 ohms at 1 kHz, DIN)Continuous RMS power output (reference)
35 + 35 watts(8 ohms at 1 kHz,10% THD)
InputsVIDEO IN: voltage 250 mV,(phono jacks) impedance 47 kilohmsMD IN: voltage 450 mV,(phono jacks) impedance 47 kilohmsDVD INPUT:
FRONT IN: voltage 450 mV,(phono jacks) impedance 47 kilohmsREAR IN: voltage 450 mV,(phono jacks) impedance 47 kilohmsCENTER IN: voltage 450 mV,(phono jacks) impedance 47 kilohmsWOOFER IN: voltage 450 mV,(phono jacks) impedance 47 kilohms
MIC1/2: sensitivity 1 mV,(mini jack) impedance 10 kilohms
OutputsMD OUT: voltage 250 mV(phono jacks) impedance 1 kilohmsVIDEO OUT: max. output level 1 Vp-p,(phono jack) unbalanced,
Sync negative,load impedance 75 ohms
S-VIDEO OUT: Y: 1 Vp-p, unbalanced,(4-pin/mini-DIN jack) Sync negative,
C: 0.286 Vp-p,load impedance 75 ohms
PHONES: accepts headphones of 8(stereo mini jack) ohms or moreFRONT SPEAKER: accepts impedance of 6 to
16 ohmsREAR SPEAKER: accepts impedance of 8 to
16 ohmsCENTER SPEAKER: accepts impedance of 8 to
16 ohmsSUPER WOOFER: Voltage 1 V, impedance
1 kilohms
Tuner sectionFM stereo, FM/AM superheterodyne tuner
FM tuner section
Tuning range 87.5 – 108.0 MHzAerial FM lead aerialAerial terminals 75 ohm unbalancedIntermediate frequency 10.7 MHz
AM tuner section
Tuning range2 Band type: 531 – 1,602 kHz
(with the interval set at9 kHz)530 – 1,710 kHz(with the interval set at10 kHz)
3 Band type:MW: 531 – 1,602 kHz
(with the interval set at9 kHz)530 – 1,710 kHz(with the interval set at10 kHz)
SW: 5.95 – 17.90 MHz(with the interval set at5 kHz)
Aerial AM loop aerialAerial terminals External aerial terminalIntermediate frequency 450 kHz
TUNER/AMPLIFIER
E ModelChinese Model
SPECIFICATIONS
STR-NX300
• STR-NX300 is the Tuner and Amplifier section in MHC-NX300AV.• STR-NX300 is almost the same as STR-NX3 Singapore model.
The difference portion and the difference parts from STR-NX3 Singapore model are de-scribed in this service manual.Please refer to STR-NX1/NX3 service manual (9-928-980-S) previously issued for otherinformation.
– Continued on next page –
2
PART No.
SAFETY-RELATED COMPONENT WARNING!!
COMPONENTS IDENTIFIED BY MARK 0 OR DOTTEDLINE WITH MARK 0 ON THE SCHEMATIC DIAGRAMSAND IN THE PARTS LIST ARE CRITICAL TO SAFEOPERATION. REPLACE THESE COMPONENTS WITHSONY PARTS WHOSE PART NUMBERS APPEAR ASSHOWN IN THIS MANUAL OR IN SUPPLEMENTS PUB-LISHED BY SONY.
1. SERVICING NOTES
• MODEL IDENTIFICATION (Page 3)– Rear Panel –
MODEL PART No.
Malaysia, Singapore and Hong Kong models 4-221-391-5[]
Thai and Chinese models 4-221-391-7[]
GeneralPower requirementsThai and Chinese models: 220 V AC, 50/60 HzOther models: 120 V, 220 V or
230 – 240 V AC, 50/60 HzAdjustable with voltageselector
Power consumption 300 watts
Dimensions (w/h/d) Approx. 225 x 202 x 356mm
Mass Approx. 8.1 kg
Design and specifications are subject to changewithout notice.
3
2. GENERAL
• LOCATION OF CONTROLS (Page 4)– Front Panel –
– Rear Panel –
1 DISPLAY button
2 ?/1 button and indicator
3 POWER SAVE/DEMO (STANDBY) button
4 – m button
5 + M button
6 FILE SELECT button
7 VIDEO/DVD button
8 EDIT button
9 MD button
0 REPEAT button
qa TAPE button
qs PLAY MODE button
qd CD button
qf DBFB button
qg TUNER button
qh DSP button
qj TUNER BAND button
qk STEREO/MONO button
ql TUNER MEMORY button
w; KARAOKE PON button
wa GROOVE button and indicator
ws ECHO LEVEL knob
wd MIC LEVEL knob
wf MIC 1 jack
wg MIC 2 jack
wh PHONES jack
wj Remote sensor
wk Jog dial
wl ENTER button and indicator
e; DVD 5.1CH button and indicator
ea PRO LOGIC button and indicator
es VOLUME knob
1 AM ANTENNA terminals
2 FM ANTENNA terminal
3 SYSTEM CONTROL connector
4 VIDEO (AUDIO) IN jacks
5 MD IN jacks
6 MD OUT jacks
7 DVD 5.1CH INPUT jacks
8 SUPER WOOFER OUT jack
9 VOLTAGE SELECTOR switch
(Malaysia, Singapore and Hong Kong models)
q; FRONT SPEAKER terminals
qa REAR SPEAKER terminals
qs CENTER SPEAKER terminals
– +
– +
M
l
m
>
1
2
3
4
5
wh wj wk wl e; ea
6 08 qs qf qh
7 9 qa qd qg
qk
ql
wa
w;
ws
wd
wf
wg
es
qj
3
4
5
6
7
8
3
4
5
6
7
8
0 qa qs0 qa qs
99
21 21
4
10
1 Press CLOCK/TIMER.The hour indication flashes.
2 Press V or v repeatedly to set thehour.
3 Press ENTER.The minute indication flashes.
4 Press V or v repeatedly to set theminute.
5 Press ENTER.The clock starts working.
Tips• If you make a mistake, start over from step 1.• Setting the time deactivates the demo mode.
If you want to display the demo mode, pressDEMO (STANDBY) when the power is off.
To change the timeThe previous explanation shows how to setthe time while the power is off. To change thetime while the power is on, do the following:
1 Press CLOCK/TIMER.2 Press V or v repeatedly to select the SET
CLOCK.3 Press ENTER.4 Perform steps 2 through 5 above.
NoteThe clock settings are cancelled when youdisconnect the mains lead or if a power failureoccurs.
You must set the time before using the timerfunctions.
Step 3: Setting thetime
2,4 3,5
1
V
v
bB
(Page 5)
5
3. DIAGRAMS
3-1. IC PIN FUNCTION DESCRIPTION (Page 24, 25)
(STR-NX1/NX3)• MAIN BOARD IC501 M30622MA-A12FP (SYSTEM CONTROLLER )
Pin No. Pin Name I/O Description
93 KEY1 I
Key input terminal (A/D input)S615 to S617, S619 to S624 (TUNER BAND, STEREO/MONO, TUNER MEMORY, GROOVE, + M, – m, ENTER, DVD 5.1CH, PRO LOGIC) keys input(S623 DVD 5.1CH, S624 PRO LOGIC keys: used for the STR-NX3 only)
(STR-NX300)• MAIN BOARD IC501 M30622MA-A29FP (SYSTEM CONTROLLER )
Pin No. Pin Name I/O Description
93 KEY1 IKey input terminal (A/D input)S615 to S624 (TUNER BAND, STEREO/MONO, TUNER MEMORY, KARAOKE PON, GROOVE, + M, – m, ENTER, DVD 5.1CH, PRO LOGIC) keys input
6
3-2. PRINTED WIRING BOARD – MAIN Board –
STR-NX300
Page STR-NX1/NX3 STR-NX300
15
! : Difference portion.
• AbbreviationCH : Chinese modelHK : Hong Kong modelMY : Malaysia model
SP : Singapore modelTH : Thai model
Location C – D, 6 – 8
(MY, SP, HK, CH)
Location D – G, 2 – 5
(TH, CH)
R540
R541
CN191
10 1(FOR TEST)
(CH)
R526
R529
(CH)
(CH)(CH)
(CH)
#$
%
$
@
#
77
STR-NX300
3-3. SCHEMATIC DIAGRAM – MAIN Board (2/3) – (Page 13)! : Difference portion.
• AbbreviationCH : Chinese modelHK : Hong Kong modelMY : Malaysia model
SP : Singapore modelTH : Thai model
$
^
!
#
#
88
STR-NX300
3-4. SCHEMATIC DIAGRAM – PA Board –! : Difference portion.
Page STR-NX1/NX3 STR-NX300
3-5. PRINTED WIRING BOARD – PANEL Board –! : Difference portion.
Location A – D, 9 – 12
19 !
#
Page STR-NX1/NX3 STR-NX300
Location D – E, 1
20
Location F – G, 1 – 4
KARAOKEPON
S618
C704
R701
R702C723
R711
R715
C727
C721
R713
R714
C722C724 C725
C726
R717R721
C728
R716
C731C729
16 9
1 8
IC702
C732
R718
C734
D701
C735
R712
@
#
^@
99
STR-NX300
3-6. SCHEMATIC DIAGRAM – PANEL Board – (Page 21)! : Difference portion.
IC702 M65850FP
OSCILLATOR
1/2 VCC
AUTORESET
LPF1
MAINCONTROL
A/D
20KBITSRAM
LPF2D/A
1 2 3 4 5 6 7
891014 13 12 11
CLOCK
RESETMO
MID1 DO0
DO1
VCC
CLOC
K
REF
OP2I
N
OP2O
UT
LPF2
IN
LPF2
OUT
LPF1
IN
LPF1
OUT
OP1O
UT
OP1I
N
CC1
CC2
GND
^
%!
$
!
1010
STR-NX300
(MY, SP, HK)
(TH, CH)
3-7. PRINTED WIRING BOARD AND SCHEMATIC DIAGRAM – TRANS Board –! : Difference portion.
Page STR-NX1/NX3 STR-NX300
4. EXPLODED VIEWS
• AbbreviationCH : Chinese modelHK : Hong Kong modelMY : Malaysia model
SP : Singapore modelTH : Thai model
The components identified by mark 0 or dottedline with mark 0 are critical for safety.Replace only with part number specified.
Page STR-NX1/NX3 STR-NX300
Ref. No. Part No. Description Remark
3 X-4952-296-1 PANEL ASSY, BACK (MY, SP, HK)3 X-4952-356-1 PANEL ASSY, BACK (CH, TH)4 1-751-688-11 WIRE (FLAT TYPE) (13CORE) (TH)
4 1-733-011-11 WIRE (FLAT TYPE) (15CORE)(MY, SP, HK)
6 1-233-545-11 TUNER PACK (FM/MW/SW) (TH)
6 1-233-546-11 TUNER PACK (FM/MW/SW) (MY, SP, HK)6 1-693-381-11 TUNER PACK (FM/MW/SW) (CH)
53 X-4952-015-2 PANEL ASSY, FRONT65 A-4426-655-A PANEL BOARD, COMPLETE67 1-769-885-11 WIRE (FLAT TYPE) (7CORE)
Ref. No. Part No. Description Remark
26
3 X-4952-296-1 PANEL ASSY, BACK (NX3: MY, SP)
4 1-733-011-11 WIRE (FLAT TYPE) (15CORE)(AEP, UK, MY, SP, JE)
6 1-233-546-11 TUNER PACK (FM/MW/SW) (MY, SP)
53 X-4951-816-1 PANEL ASSY, FRONT (NX3: E, AUS)65 A-4426-275-A PANEL BOARD, COMPLETE (NX3: E, AUS)67 1-769-886-11 WIRE (FLAT TYPE) (7CORE)
65
68
6268
64
6667
63
notsupplied
65
68
6268
64
6667
63
notsupplied
27
The components identified bymark 0 or dotted line with mark0 are critical for safety.Replace only with part numberspecified.
• Items marked “*” are not stocked since theyare seldom required for routine service. Somedelay should be anticipated when orderingthese items.
• AbbreviationCH : Chinese modelHK : Hong Kong modelMY : Malaysia modelSP : Singapore modelTH : Thai model
(MY, S
(
JW95
3
22
Location A – D, 5 – 7
(MY, SP, HK)
(TH, CH)
@
23
@
#
$
^
#
11
Page STR-NX1/NX3 STR-NX300
Ref. No. Part No. Description RemarkRef. No. Part No. Description Remark29102 A-4426-281-A PA BOARD, COMPLETE (NX3: E, AUS)
0104 1-575-651-11 CORD, POWER (NX: MY, SP)
* 105 3-703-244-00 BUSHING (2104), CORD
106 A-4426-277-A MAIN BORD, COMPLETE (NX3: MY, SP)(US, CND, AEP, UK, KR, MY, SP, AUS)
109 4-221-364-01 CHASSIS0T951 1-433-996-11 TRANSFORMER, POWER (NX3: E, AUS)
102 A-4428-730-A PA BOARD, COMPLETE0104 1-777-071-51 CORD, POWER (HK, MY, SP)0104 1-783-205-11 CORD, POWER (CH)0104 1-791-901-11 CORD, POWER (TH)* 105 3-703-244-21 BUSHING (2104), CORD (MY, SP, HK, CH)
* 105 3-703-571-11 BUSHING (S) (4516), CORD (TH)106 A-4426-657-A MAIN BORD, COMPLETE (MY, SP, HK)
106 A-4428-007-A MAIN BORD, COMPLETE (CH)106 A-4428-364-A MAIN BORD, COMPLETE (TH)
0107 1-770-019-11 ADAPTOR, CONVERSION 2P (HK)
109 X-4952-635-1 CHASSIS ASSY0T951 1-435-279-11 TRANSFORMER, POWER
105102
#2
#5
supplied
A105
102
#2
#5 #5
notsupplied
A
The components identified bymark 0 or dotted line withmark 0 are critical for safety.Replace only with part num-ber specified.
12
5. ELECTRICAL PARTS LIST• Items marked “*” are not stocked since they
are seldom required for routine service.Some delay should be anticipated when order-ing these items.
The components identified bymark 0 or dotted line with mark0 are critical for safety.Replace only with part numberspecified.
When indicating parts by referencenumber, please include the board.
• AbbreviationCH : Chinese modelHK : Hong Kong modelMY : Malaysia modelSP : Singapore modelTH : Thai model
Page STR-NX1/NX3 STR-NX300
Ref. No. Part No. Description RemarkRef. No. Part No. Description Remark
30
32
35
36
A-4426-277-A MAIN BOARD, COMPLETE (NX3: MY, SP)
*********************
CN121 1-784-776-11 CONNECTOR, FFC 15P(AEP, UK, MY, SP, JE)
IC501 8-759-597-56 IC M30622MA-A12FP
R582 1-249-407-11 CARBON 150 5% 1/4W(NX3)
R584 1-249-417-11 CARBON 1K 5% 1/4W(MY, SP, JE)
A-4426-281-A PA BOARD, COMPLETE (NX3: E, AUS)*******************
C883 1-127-813-11 ELECT 3300uF 20% 71V(E, AUS, JE)
C884 1-127-813-11 ELECT 3300uF 20% 71V(E, AUS, JE)
A-4426-657-A MAIN BOARD, COMPLETE (MY, SP, HK)A-4428-007-A MAIN BOARD, COMPLETE (CH)A-4428-364-A MAIN BOARD, COMPLETE (TH)
*********************
CN121 1-784-774-11 CONNECTOR, FFC 13P (TH)
CN121 1-784-776-11 CONNECTOR, FFC 15P (MY, SP, HK, CH)
IC501 8-759-656-80 IC M30622MA-A29FP
R582 1-249-415-11 CARBON 680 5% 1/4W
R583 1-249-425-11 CARBON 4.7K 5% 1/4W(TH, CH)
R584 1-249-411-11 CARBON 330 5% 1/4W(TH)
R584 1-249-415-11 CARBON 680 5% 1/4W(CH)
R584 1-249-417-11 CARBON 1K 5% 1/4W(MY, SP, HK)
A-4428-730-A PA BOARD, COMPLETE*******************
C883 1-127-812-11 ELECT 3300uF 20% 63V
C884 1-127-812-11 ELECT 3300uF 20% 63V
13
A-4426-275-A PANEL BOARD, COMPLETE (NX3: E, AUS)**********************
C714 1-162-282-31 CERAMIC 100PF 10% 50V
R707 1-249-433-11 CARBON 22K 5% 1/4W
Page STR-NX1/NX3 STR-NX300Ref. No. Part No. Description RemarkRef. No. Part No. Description Remark
A-4426-655-A PANEL BOARD, COMPLETE**********************
C704 1-162-306-11 CERAMIC 0.01uF 30% 16VC705 1-126-961-11 ELECT 2.2uF 20% 50VC714 1-162-284-31 CERAMIC 150PF 10% 50VC721 1-162-294-31 CERAMIC 0.001uF 10% 50VC722 1-162-305-11 CERAMIC 0.0068uF 30% 16V
C723 1-126-960-11 ELECT 1uF 20% 50VC724 1-136-495-11 MYLAR 0.068uF 5% 50VC725 1-126-959-11 ELECT 0.47uF 20% 50VC726 1-126-959-11 ELECT 0.47uF 20% 50VC727 1-136-167-00 MYLAR 0.15uF 5% 50V
C728 1-162-294-31 CERAMIC 0.001uF 10% 50VC729 1-126-960-11 ELECT 1uF 20% 50VC730 1-161-494-00 CERAMIC 0.022uF 25VC731 1-162-305-11 CERAMIC 0.0068uF 30% 16VC732 1-136-495-11 MYLAR 0.068uF 5% 50V
C733 1-104-664-11 ELECT 47uF 20% 16VC734 1-164-159-11 CERAMIC 0.1uF 50VC735 1-104-664-11 ELECT 47uF 20% 16VC736 1-126-961-11 ELECT 2.2uF 20% 50V
D701 8-719-109-85 DIODE MTZJ-T-72-5.1B
J703 1-785-569-11 JACK (SMALL TYPE) (MIC 2)
IC702 8-759-496-40 IC M65850FP
R701 1-249-429-11 CARBON 10K 5% 1/4WR702 1-249-417-11 CARBON 1K 5% 1/4WR707 1-249-437-11 CARBON 47K 5% 1/4WR711 1-249-433-11 CARBON 22K 5% 1/4WR712 1-249-401-11 CARBON 47 5% 1/4W
R713 1-249-433-11 CARBON 22K 5% 1/4WR714 1-249-433-11 CARBON 22K 5% 1/4WR715 1-249-437-11 CARBON 47K 5% 1/4WR716 1-249-433-11 CARBON 22K 5% 1/4WR717 1-249-433-11 CARBON 22K 5% 1/4W
R718 1-247-881-00 CARBON 120K 5% 1/4WR719 1-249-431-11 CARBON 15K 5% 1/4WR720 1-249-431-11 CARBON 15K 5% 1/4WR721 1-249-433-11 CARBON 22K 5% 1/4W
S618 1-762-875-21 SWITCH, KEYBOARD (KARAOKE PON)
RV702 1-225-739-11 RES, VAR CARBON 50K (ECHO LEVEL)
0F951 1-532-505-31 FUSE T5AL/250V (MY, SP, HK)
0S951 1-771-291-11 SWITCH, POWER (VOLTAGE SELECTOR)(MY, SP, HK)
0T951 1-435-279-11 TRANSSFORMER, POWER
0F951 1-533-949-31 FUSE T8AL/250V (NX3: MY, SP)
0S951 1-771-291-11 SWITCH, POWER (VOLTAGE SELECTOR)(MY, SP, JE)
0T951 1-433-996-11 TRANSSFORMER, POWER (NX3: E AUS)
The components identified bymark 0 or dotted line withmark 0 are critical for safety.Replace only with part num-ber specified.
40
41
39
14
Page STR-NX1/NX3 STR-NX300
Ref. No. Part No. Description RemarkRef. No. Part No. Description Remark
41
MISCELLANEOUS**************
4 1-751-688-11 WIRE (FLAT TYPE) (13CORE) (TH)4 1-733-011-11 WIRE (FLAT TYPE) (15CORE)
(MY, SP, HK)6 1-233-545-11 TUNER PACK (FM/MW/SW) (TH)6 1-233-546-11 TUNER PACK (FM/MW/SW) (MY, SP, HK)6 1-693-381-11 TUNER PACK (FM/MW/SW) (CH)
67 1-769-885-11 WIRE (FLAT TYPE) (7CORE)0104 1-777-071-51 CORD, POWER (HK, MY, SP)0104 1-783-205-11 CORD, POWER (CH)0104 1-791-901-11 CORD, POWER (TH)0107 1-770-019-11 ADAPTOR, CONVERSION 2P (HK)
0T951 1-435-279-11 TRANSFORMER, POWER
STR-NX300
Sony CorporationHome Audio Division Company
9-929-045-112000A0570082-1
Printed in Singapore C 2000. 1Published by Quality Assurance Dept.
MISCELLANEOUS**************
4 1-733-011-11 WIRE (FLAT TYPE) (15CORE)(AEP, UK, MY, SP, JE)
6 1-233-546-11 TUNER PACK (FM/MW/SW) (MY, SP)
67 1-769-886-11 WIRE (FLAT TYPE) (7CORE)0104 1-575-651-11 CORD, POWER (NX3: MY, SP)
0T951 1-433-996-11 TRANSFORMER, POWER (NX3: E, AUS)
The components identified bymark 0 or dotted line withmark 0 are critical for safety.Replace only with part num-ber specified.