Sony STR-W55 User manual

MICROFILM

SERVICE MANUAL

STR-W55 is RECEIVER section in

MHC-W55.

AEP Model

UK Model

STR-W55

FM STEREO/FM-AM RECEIVER

– 2 –

Specifications ...................................................................................1

1. GENERAL ...............................................................................3

2. TEST MODE ...........................................................................4

3. ELECTRICAL ADJUSTMENTS ..........................................5

4. EXPLANATION OF ICTERMINALS ..................................6

5. DIAGRAMS

5-1. Printed Wiring Boards – Main Section–..........................10

5-2. Schematic Diagram – Main Section–..............................13

5-3. Schematic Diagram – Panel Section– .............................18

5-4. Printed Wiring Boards – Panel Section– .........................21

5-5. Schematic Diagram – TCB Section–...............................23

5-6. Printed Wiring Boards – TCB Section– ..........................25

6. EXPLODED VIEWS

6-1. Chassis Section................................................................26

6-2. Front Panel Section .........................................................27

7. ELECTRICAL PARTS LIST ...............................................28

Section Title Page

TABLE OF CONTENTS

MODEL INDENTIFICATION

– BACK PANEL –

Parts No. Model

4-978-033-6πUK

4-978-033-2πAEP, German, Italian, AED

rAbbreviation

AED : Norway, Sweden, Finland, Denmark

Notes on chip component replacement

• Never reuse a disconnected chip component.

• Notice that the minus side of a tantalum capacitor may be damaged

by heat.

SAFETY-RELATED COMPONENT WARNING!!

COMPONENTS IDENTIFIED BY MARK !OR DOTTED LINEWITH

MARK !ONTHE SCHEMATIC DIAGRAMS AND INTHE PARTS LIST

ARE CRITICALTO SAFE OPERATION.

REPLACETHESECOMPONENTSWITH SONY PARTSWHOSEPART

NUMBERS APPEAR AS SHOWN IN THIS MANUAL OR IN

SUPPLEMENTS PUBLISHED BY SONY.

220-230V AC, 50/60Hz (EXCEPT UK)

220-240V AC, 50/60Hz (UK)

– 3 –

SECTION 1

GENERAL This section is extracted from

instruction manual.

– 4 –

SECTION 2

TEST MODE

DISPLAY / KEYTEST MODE

Press the ENTER/NEXT and FUNCTION buttons simultaneously.

Then press the MENU 1 button with the following 4 seconds to set the Test Mode.

1. The message “W1 J (destination) ” appears on the screen and a 32 cycle square wave of the subcrystal oscillator is output from Pin 24

(AUB. OUT).

2. Press any key to rotate JOG and all FL indicators light up.

When you rotate JOG at this point, the display changes as follows.

Nall FL indicators on Nn FL pattern 1 Nn FL pattern 2 n

The changes and all LED indicators light up.

3. Again press any key to set the key count check. The following display appears.

00 0

The numbers in order from left to right show ; the number of keys pressed, the JOG count (1 click per 4 counts), and the VOL count.

(1 cycle is a count of 96.)

4. Press the Power button to reset to the factory settings.

AMPTEST MODE

Press the ENTER/NEXT and FUNCTION buttons simultaneously.

Then press the MENU 2 button with the following 4 seconds to set the Test Mode.

1. The message “AMP TEST” appears on the screen. Press the MENU button to call up the Equalizer Curve for theAmp Test.

However when the function is set to the tuner, use the MENU button to call up each tuner preset from 1 through 5.

2. Press the Power button to reset to the factory settings.

MICROCOMPUTER COLD START

Press the ENTER/NEXT and FUNCTION buttons simultaneously.

Then press the MENU 3 button with the following 4 seconds to reset the microcomputer to the factory settings.

SUBCRYSTALTEST MODE

Press the ENTER/NEXT and FUNCTION buttons simultaneously.

Then press the MENU 4 button with the following 4 seconds.

The message “XTAL TEST ” appears on the screen and a 32 cycle square wave of the subcrystal oscillator is output from Pin 24 (AUB.OUT).

In addition, a square wave of the same frequency as the subcrystal oscillator, is output from 4PIN (POWER. ON/OFF).

Press the Power button to reset to the factory settings.

– 5 –

SECTION 3

ELECTRICAL ADJUSTMENTS

Precautions in Repairing

Note. 1 : The adjustment should be performed in the publication.

(AM nFM)

Note. 2 : As a front-end (FE1) is difficult to repair if faulty, replace it

with new one.

AM SECTION

AMTuned Indication Lighting Level

Setting :

Band :AM ( MW)

set

AM RF signal

generator

Carrier frequency : 999kHz

loop antenna B

loop antenna A

Procedure :

1. Set loop antennaA so that the loop antenna B input level becomes

55dBµ/m (0.6mV/m).

2. Tune the set to 999kHz .

3. Adjust RV41 so that the TUNED indicator goes on.

FM SECTION

FMTuned Indication Lighting Level

Note : Always make the tuning level adjustment first.

(Since it affects the FM tuning level.)

Setting :

Band : FM

set

FM RF stereo signal

generator FM ANTENNA terminal

Carrier frequency : 98MHz

Modulation : OFF

Output level :0.018mV (25dB

)

Ω

coaxial

Procedure :

1. Tune the set to 98MHz.

2. Adjust RV42 so that the TUNED indicator goes on.

Adjustment Location : TCB board

Adjustment Location :

[TCB BOARD ] – Component side –

RV42 : FM Tuned Indication Lighting Level

RV41 : AMTuned Indication Lighting Level

FE1

– 6 –

1VDD – Power supply.

2 CLK OUT O Direct output for communications with HCD-W55.

3 RDY IN I/O Direct input / output for communications with HCD-W55.

4 POWER ON / OFF O L : Relay ON

5 MUTE O Mute output to transistor. L : Mute ON

6,7 – – Not used.

8 427LAT O Latch output to IC105 (M62427FP).

9 LED LAT O Latch output to IC504 (M66313FP).

10 RESET I Reset terminal.

11 X2 – Oscillator connection terminal. (5MHz)

12 X1 – Oscillator connection terminal. (5MHz)

13 IC – Ground connection.

14 XT2 – Oscillator connection terminal. (32MHz)

15 XT1 – Oscillator connection terminal. (32MHz)

16 VDD – Power supply.

17 BACK UP I AC Power supply OFF.

18 COM CLK O Transfer clock output serial data.

19 COM DATA O Serial data output.

20 ST DATA IN I Serial data input from IC 1.

21 ST CE O Chip enable output to IC 1.

22 STEREO I Stereo signal input.

23 TUNED I Tuned signal input.

24 AUB OUT O Audio bus output.

25 AVSS – Ground.

26 – – Not used.

27 SUFFIX I Input for model select.

28 SPE I Spectrum analyzer signal input.

29 SPE I Spectrum analyzer signal input.

30 SPE I Spectrum analyzer signal input.

31 SPE I Spectrum analyzer signal input.

32 KYE 1 I Key data input (A/D converter).

33 KYE 2 I Key data input (A/D converter).

34 AVDD – Power supply for anlog.

35 AV REF – Reference voltage forA/D converter.

36 VOL IN A I Volume encoder input.

37 JOG IN A I JOG dial encoder input.

38 RDS CLK I Not uset.

39 AUB IN I Audio bus output.

40 VSS – Ground.

IC501 1 ASD0204GF-011-3BA (SYSTEM CONTOROL)

SECTION 4

EXPLANATION OF ICTERMINALS

Pin No. Pin name I/O Description

– 7 –

41 RDS DATA I Not uset.

42 D 3 I/O System control data signal input / output.

43 D 2 I/O System control data signal input / output.

44 D 1 I/O System control data signal input / output.

45 D 0 I/O System control data signal input / output.

46 VDD – Power supply +5V.

47 SIRCS IN I SIRCS signal input.

48 VOL IN B I Volume encoder input.

49 JOG IN B I JOG dial encoder input.

50 ST FM O BAND select output.

51 ST MUTE O

52 EMG OUT O Urgent signal standby output. “H” : standby

53 EMG IN I Urgent signal start input. “H” n“L” : start

57 – 78 P 32 – P 8 O Segment output to FL501.

79 VG – Power supply for fluorescent indicator tube.

80 – 86 P 7 – P 1 O Segment output to FL501.

87 – 100 14 G – 1 G O Grid output for FL501.

FM Receiving AM Receiving MUTE

%º pin H L H

%¡ pin L L H

Pin No. Pin name I/O Description

– 8 –

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