Sony STRNX-300 Service manual

STR-NX300

SERVICE MANUAL

• 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 de­scribed in this service manual.
Please refer to STR-NX1/NX3 service manual (9-928-980-S) previously issued for other
information.

SPECIFICATIONS

Amplifier section

The following measured at AC 120/220/240 V,
50/60 Hz

Front Speaker:

DIN power output (rated) 95 + 95 watts

Continuous RMS power output (reference)

Centre Speaker:

DIN power output (rated) 25 watts

Continuous RMS power output (reference)

Rear Speaker:

DIN power output (rated) 25 + 25 watts

Continuous RMS power output (reference)

Inputs
VIDEO IN: voltage 250 mV,
(phono jacks) impedance 47 kilohms
MD IN: voltage 450 mV,
(phono jacks) impedance 47 kilohms
DVD INPUT:

FRONT IN: voltage 450 mV,
(phono jacks) impedance 47 kilohms
REAR IN: voltage 450 mV,
(phono jacks) impedance 47 kilohms
CENTER IN: voltage 450 mV,
(phono jacks) impedance 47 kilohms
WOOFER IN: voltage 450 mV,

(phono jacks) impedance 47 kilohms
MIC1/2: sensitivity 1 mV,
(mini jack) impedance 10 kilohms

Outputs
MD OUT: voltage 250 mV
(phono jacks) impedance 1 kilohms
VIDEO OUT: max. output level 1 Vp-p,
(phono jack) unbalanced,

S-VIDEO OUT: Y: 1 Vp-p, unbalanced,
(4-pin/mini-DIN jack) Sync negative,

(6 ohms at 1 kHz, DIN)

120 + 120 watts
(6 ohms at 1 kHz,
10% THD)

(8 ohms at 1 kHz, DIN)

35 watts
(8 ohms at 1 kHz,
10% THD)

(8 ohms at 1 kHz, DIN)

35 + 35 watts
(8 ohms at 1 kHz,
10% THD)

Sync negative,
load impedance 75 ohms

C: 0.286 Vp-p,
load impedance 75 ohms

Chinese Model

PHONES: accepts headphones of 8
(stereo mini jack) ohms or more
FRONT SPEAKER: accepts impedance of 6 to

REAR SPEAKER: accepts impedance of 8 to

CENTER SPEAKER: accepts impedance of 8 to

SUPER WOOFER: Voltage 1 V, impedance

Tuner section

FM stereo, FM/AM superheterodyne tuner

FM tuner section

Tuning range 87.5 – 108.0 MHz
Aerial FM lead aerial
Aerial terminals 75 ohm unbalanced
Intermediate frequency 10.7 MHz

AM tuner section

Tuning range
2 Band type: 531 – 1,602 kHz

3 Band type:
MW: 531 – 1,602 kHz

SW: 5.95 – 17.90 MHz

Aerial AM loop aerial
Aerial terminals External aerial terminal
Intermediate frequency 450 kHz

16 ohms

16 ohms

16 ohms

1 kilohms

(with the interval set at
9 kHz)
530 – 1,710 kHz
(with the interval set at
10 kHz)

(with the interval set at
9 kHz)
530 – 1,710 kHz
(with the interval set at
10 kHz)

(with the interval set at
5 kHz)

– Continued on next page –

TUNER/AMPLIFIER

E Model

MICROFILM

General

Power requirements
Thai and Chinese models: 220 V AC, 50/60 Hz
Other models:

Power consumption 300 watts

Dimensions (w/h/d)

Mass

Design and specifications are subject to change
without notice.

120 V, 220 V or
230 – 240 V
Adjustable with voltage
selector

Approx. 225 x 202 x 356
mm

Approx. 8.1

AC, 50/60 Hz

kg

1. SERVICING NOTES

• MODEL IDENTIFICATION (Page 3)

– Rear Panel –

PART No.

MODEL PART No.

Malaysia, Singapore and Hong Kong models 4-221-391-5[]
Thai and Chinese models 4-221-391-7[]

SAFETY-RELATED COMPONENT WARNING!!

COMPONENTS IDENTIFIED BY MARK 0 OR DOTTED
LINE WITH MARK 0 ON THE SCHEMATIC DIAGRAMS
AND IN THE PARTS LIST ARE CRITICAL TO SAFE
OPERATION. REPLACE THESE COMPONENTS WITH
SONY PARTS WHOSE PART NUMBERS APPEAR AS
SHOWN IN THIS MANUAL OR IN SUPPLEMENTS PUB­LISHED BY SONY.

2

2. GENERAL

• LOCATION OF CONTROLS (Page 4)

– Front Panel –

1

2

3
4
5

wh

– Rear Panel –

l

wj

9

7

6

–

m

wk

qa qd

08

+

M

>

wl e; ea

qs

qg

qf qh

–

es

1 DISPLAY button
2 ?/1 button and indicator
3 POWER SAVE/DEMO (STANDBY) button

qj
qk

ql

4 – m button
5 + M button
6 FILE SELECT button
7 VIDEO/DVD button
8 EDIT button
9 MD button

w;
wa

+

ws

wd

wf

0 REPEAT button
qa TAPE button
qs PLAY MODE button
qd CD button
qf DBFB button
qg TUNER button

wg

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

3

3

4

4
5

5

6

6

7

7

8

8

0

0

1

212

qa

qa

qs

qs

99

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

3

(Page 5)

Step 3: Setting the
time

You must set the time before using the timer
functions.

1

1

Press CLOCK/TIMER.

The hour indication flashes.

2

Press V or v repeatedly to set the
hour.

3

Press ENTER.

The minute indication flashes.

4

Press V or v repeatedly to set the
minute.

2,4

V

bB

v

3,5

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, press
DEMO (STANDBY) when the power is off.

To change the time

The previous explanation shows how to set
the time while the power is off. To change the
time 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.

Note

The clock settings are cancelled when you
disconnect the mains lead or if a power failure
occurs.

10

4

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

Key input terminal (A/D input)

93 KEY1 I

(STR-NX300)

• MAIN BOARD IC501 M30622MA-A29FP (SYSTEM CONTROLLER )

Pin No. Pin Name I/O

93 KEY1 I

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)

Key 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

Description

Description

5

STR-NX300

3-2. PRINTED WIRING BOARD – MAIN Board –

! : Difference portion.

Page STR-NX1/NX3 STR-NX300

Location C – D, 6 – 8

#

(MY, SP, HK, CH)

Location D – G, 2 – 5

15

(TH, CH)

@

R540

R541

CN191

10 1

(FOR TEST)

(CH)

#

(CH)

R526

%

R529

$

(CH)

(CH)

(CH)

$

• Abbreviation
CH : Chinese model
HK : Hong Kong model
MY : Malaysia model

SP : Singapore model
TH : Thai model

6

3-3. SCHEMATIC DIAGRAM – MAIN Board (2/3) – (Page 13)

! : Difference portion.

STR-NX300

$

#

!

#

^

• Abbreviation
CH : Chinese model
HK : Hong Kong model

77

MY : Malaysia model

SP : Singapore model
TH : Thai model

STR-NX300

3-4. SCHEMATIC DIAGRAM – PA Board –

! : Difference portion.

Page STR-NX1/NX3 STR-NX300

Location A – D, 9 – 12

19

!

#

3-5. PRINTED WIRING BOARD – PANEL Board –

! : Difference portion.

Page STR-NX1/NX3 STR-NX300

Location D – E, 1

S618

KARAOKE

PON

Location F – G, 1 – 4

20

^

C704

R701

R715

R702

R711

C727

16

1

@

IC702

C721

C723

R713

C734

R714

D701

R712

C735

R718

C732

9

C729

C731

C728

8

R716

C722

C724

C725

R721

C726

R717

@

#

88

3-6. SCHEMATIC DIAGRAM – PANEL Board – (Page 21)

! : Difference portion.

STR-NX300

^

%

!

!

$

IC702 M65850FP

VCC

1/2 VCC

AUTO

RESET

CLOCK

OSCILLATOR

CLOCK

RESET

CONTROL

D1

REF

MAIN

DO0

DO1

OP2IN

D/A

MO

MI

OP2OUT

LPF2IN

20KBIT

LPF2OUT

891014 13 12 11

LPF2

SRAM

LPF1

2 345 6 7

1

LPF1IN

LPF1OUT

A/D

OP1IN

OP1OUT

CC1

CC2

GND

99

STR-NX300

65

68

62

68

64

66

67

63

not
supplied

S

(

3-7. PRINTED WIRING BOARD AND SCHEMATIC DIAGRAM – TRANS Board –

! : Difference portion.

Page STR-NX1/NX3 STR-NX300

(MY,

JW953

@

22

Location A – D, 5 – 7

#

(TH, CH)

(MY, SP, HK)

$

4. EXPLODED VIEWS

• Abbreviation
CH : Chinese model
HK : Hong Kong model
MY : Malaysia model
SP : Singapore model
TH : Thai model

Page STR-NX1/NX3 STR-NX300

Ref. No. Part No. Description Remark

3 X-4952-296-1 PANEL ASSY, BACK (NX3: MY, SP)

4 1-733-011-11 WIRE (FLAT TYPE) (15CORE)

26

6 1-233-546-11 TUNER PACK (FM/MW/SW) (MY, SP)

65

• Items marked “*” are not stocked since they
are seldom required for routine service. Some
delay should be anticipated when ordering
these items.

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)

(AEP, UK, MY, SP, JE)

4 1-733-011-11 WIRE (FLAT TYPE) (15CORE)

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)

The components identified by
mark 0 or dotted line with mark
0 are critical for safety.
Replace only with part number
specified.

(MY, SP, HK)

23

68

62

68

^

(

TH, CH)

(

MY, SP, HK)

@

27

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)

63

not
supplied

67

64

66

53 X-4952-015-2 PANEL ASSY, FRONT
65 A-4426-655-A PANEL BOARD, COMPLETE
67 1-769-885-11 WIRE (FLAT TYPE) (7CORE)

#

• Abbreviation
CH : Chinese model
HK : Hong Kong model
MY : Malaysia model

The components identified by mark 0 or dotted
line with mark 0 are critical for safety.
Replace only with part number specified.

SP : Singapore model
TH : Thai model

1010

Page STR-NX1/NX3 STR-NX300

not

supplied

#5

#2

105

A

Ref. No. Part No. Description Remark

29

102 A-4426-281-A PA BOARD, COMPLETE (NX3: E, AUS)

0 104 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)

109 4-221-364-01 CHASSIS

0 T951 1-433-996-11 TRANSFORMER, POWER (NX3: E, AUS)

(US, CND, AEP, UK, KR, MY, SP, AUS)

supplied

#5

#2

102

105

A

Ref. No. Part No. Description Remark

102 A-4428-730-A PA BOARD, COMPLETE

0 104 1-777-071-51 CORD, POWER (HK, MY, SP)
0 104 1-783-205-11 CORD, POWER (CH)
0 104 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)

0 107 1-770-019-11 ADAPTOR, CONVERSION 2P (HK)

109 X-4952-635-1 CHASSIS ASSY

0 T951 1-435-279-11 TRANSFORMER, POWER

#5

102

The components identified by
mark 0 or dotted line with
mark 0 are critical for safety.
Replace only with part num­ber specified.

11

5. ELECTRICAL PARTS LIST

• Abbreviation
CH : Chinese model
HK : Hong Kong model
MY : Malaysia model
SP : Singapore model
TH : Thai model

Page STR-NX1/NX3 STR-NX300

30

A-4426-277-A MAIN BOARD, COMPLETE (NX3: MY, SP)

*********************

• Items marked “*” are not stocked since they
are seldom required for routine service.
Some delay should be anticipated when order­ing these items.

Ref. No. Part No. Description RemarkRef. No. Part No. Description Remark

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)

The components identified by
mark 0 or dotted line with mark
0 are critical for safety.
Replace only with part number
specified.

When indicating parts by reference
number, please include the board.

*********************

32

35

36

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)

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

12

Page STR-NX1/NX3 STR-NX300

Ref. No. Part No. Description Remark

Ref. No. Part No. Description Remark

39

A-4426-275-A PANEL BOARD, COMPLETE (NX3: E, AUS)

**********************

C714 1-162-282-31 CERAMIC 100PF 10% 50V

A-4426-655-A PANEL BOARD, COMPLETE

**********************

C704 1-162-306-11 CERAMIC 0.01uF 30% 16V
C705 1-126-961-11 ELECT 2.2uF 20% 50V
C714 1-162-284-31 CERAMIC 150PF 10% 50V
C721 1-162-294-31 CERAMIC 0.001uF 10% 50V
C722 1-162-305-11 CERAMIC 0.0068uF30% 16V

C723 1-126-960-11 ELECT 1uF 20% 50V
C724 1-136-495-11 MYLAR 0.068uF 5% 50V
C725 1-126-959-11 ELECT 0.47uF 20% 50V
C726 1-126-959-11 ELECT 0.47uF 20% 50V
C727 1-136-167-00 MYLAR 0.15uF 5% 50V

C728 1-162-294-31 CERAMIC 0.001uF 10% 50V
C729 1-126-960-11 ELECT 1uF 20% 50V
C730 1-161-494-00 CERAMIC 0.022uF 25V
C731 1-162-305-11 CERAMIC 0.0068uF30% 16V
C732 1-136-495-11 MYLAR 0.068uF 5% 50V

C733 1-104-664-11 ELECT 47uF 20% 16V
C734 1-164-159-11 CERAMIC 0.1uF 50V
C735 1-104-664-11 ELECT 47uF 20% 16V
C736 1-126-961-11 ELECT 2.2uF 20% 50V

D701 8-719-109-85 DIODE MTZJ-T-72-5.1B

R707 1-249-433-11 CARBON 22K 5% 1/4W

40

0 F951 1-533-949-31 FUSE T8AL/250V (NX3: MY, SP)

0S951 1-771-291-11 SWITCH, POWER (VOLTAGE SELECTOR)

41

0 T951 1-433-996-11 TRANSSFORMER, POWER (NX3: E AUS)

(MY, SP, JE)

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% 1/4W
R702 1-249-417-11 CARBON 1K 5% 1/4W
R707 1-249-437-11 CARBON 47K 5% 1/4W
R711 1-249-433-11 CARBON 22K 5% 1/4W
R712 1-249-401-11 CARBON 47 5% 1/4W

R713 1-249-433-11 CARBON 22K 5% 1/4W
R714 1-249-433-11 CARBON 22K 5% 1/4W
R715 1-249-437-11 CARBON 47K 5% 1/4W
R716 1-249-433-11 CARBON 22K 5% 1/4W
R717 1-249-433-11 CARBON 22K 5% 1/4W

R718 1-247-881-00 CARBON 120K 5% 1/4W
R719 1-249-431-11 CARBON 15K 5% 1/4W
R720 1-249-431-11 CARBON 15K 5% 1/4W
R721 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)

0 F951 1-532-505-31 FUSE T5AL/250V (MY, SP, HK)

0 S951 1-771-291-11 SWITCH, POWER (VOLTAGE SELECTOR)

(MY, SP, HK)

0 T951 1-435-279-11 TRANSSFORMER, POWER

The components identified by
mark 0 or dotted line with
mark 0 are critical for safety.
Replace only with part num­ber specified.

13

STR-NX300

Page STR-NX1/NX3 STR-NX300

Ref. No. Part No. Description RemarkRef. No. Part No. Description Remark

MISCELLANEOUS

**************

MISCELLANEOUS

**************

4 1-733-011-11 WIRE (FLAT TYPE) (15CORE)

6 1-233-546-11 TUNER PACK (FM/MW/SW) (MY, SP)

41

67 1-769-886-11 WIRE (FLAT TYPE) (7CORE)

0 104 1-575-651-11 CORD, POWER (NX3: MY, SP)

0 T951 1-433-996-11 TRANSFORMER, POWER (NX3: E, AUS)

(AEP, UK, MY, SP, JE)

4 1-751-688-11 WIRE (FLAT TYPE) (13CORE) (TH)
4 1-733-011-11 WIRE (FLAT TYPE) (15CORE)

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)

0 104 1-777-071-51 CORD, POWER (HK, MY, SP)
0 104 1-783-205-11 CORD, POWER (CH)
0 104 1-791-901-11 CORD, POWER (TH)
0 107 1-770-019-11 ADAPTOR, CONVERSION 2P (HK)

0 T951 1-435-279-11 TRANSFORMER, POWER

The components identified by
mark 0 or dotted line with
mark 0 are critical for safety.
Replace only with part num­ber specified.

(MY, SP, HK)

9-929-045-11

14

Sony Corporation

Home Audio Division Company

Printed in Singapore C 2000. 1

2000A0570082-1

Published by Quality Assurance Dept.