Sony HCD-W550 Schematic

HCD-W550

SERVICE MANUAL

Canadian Model

AEP Model

UK Model

E Model

Australian Model

Tourist Model

•HCD-W550 is the deck, CD section in MHC-W550/W770AV.

Manufactured under license from Dolby Laboratories Licensing Corporation.

“DOLBY” and the double-D symbol aare trademarks of Dolby Laboratories Licensing Corporation.

	CD	Model Name Using Similar Mechanism	HCD-GR8/RX90
		CD Mechanism Type	CDM38-5BD29A
	Section
		Base Unit Name	BU-5BD29A
	Tape deck	Model Name Using Similar Mechanism	HCD-GR5/RX50
	Section	Tape Transport Mechanism Type	TCM-220WR2E

SPECIFICATIONS

CD player section
system	Compact disc and digital
	audio system
Laser	Semiconductor laser
	(l = 780 mm)
	Emission duration :
	continuous
Laser output	Max. 44.6 mW*
	*This output is the value
	measured at a distance of
	200 mm from the
	objective lens surface on
	the Optical Pick-up Block
	with 7 mm aperture.
Frequency response	2Hz - 20 kHz (± 0.5dB)
Wavelenght	780 - 790 mm
Signal to noise ratio	More than 90 dB
Dynamic renge	More than 90 dB
CD OPTICAL DIGITAL OUT
(Square optical connector jack, rear panel)
Wavelength	600 mm
Output Level	- 18 dBm

Tape player section

Recording system	4 track 2 channel stereo
Frequency response	60 - 13,000 Hz (± 3dB),
(DOLBY NR OFF)	using Sony TYPE I
	cassette
	60 - 14,000 Hz (± 3 dB),
	using Sony TYPE II
	cassette

General

Dimensions (w / h / d)Approx. 280 ¥ 205 ¥ 359

	mm
Mass	Approx. 4.3 kg

Design and specifications are subject to change without notice.

STEREO CASSETTE DECK CD PLAYER

MICROFILM

TABLE OF CONTENTS

1.GENERAL ···················································5. EXPLODED VIEWS ··········

		5-1.	Main Section ·····························
2.	DISASSEMBLY	5-2.	Front Panel Section ··························
2-1.		5-3.	CD Mechanism Deck Section-1 (CDM38-5BD29A) ····· 44
	Back Panel, CD Block Removal ········································· 4
2-2.	Cassette Lid (A)/(B) Assy, Mechanism Deck Removal ···· 45-4.		CD Mechanism Deck Section-2 (CDM38-5BD29A) ····· 45
2-3.	Main Board, Resistor Board, Front Panel Assy Removal ·· 5	5-5.	Base Unit Section (BU-5BD29A) ····················
		5-6.	Tape Mechanism Deck Section-1 (TCM-220WR2E) ······ 47
3.	ADJUSTMENTS	5-7.	Tape Mechanism Deck Section-2 (TCM-220WR2E) ······ 48
3-1.	Mechanical Adjustment ··················································· ··· 6
3-2.		6.	ELECTRICAL PARTS LIST ····················
	Electrical Adjustment ···················································			6

4.DIAGRAMS

4-1. Block Diagram ··················································· ·········

4-2. Circuit Boards Location ··················································· 13 4-3. Schematic Diagram — Audio Section — ························· 14

4-4. Printed Wiring Board — Audio Section — ······················ 17

4-5. Printed Wiring Board — BD Section — ·························· 19 4-6. Schematic Diagram — BD Section — ····························· 21 4-7. Printed Wiring Board — Motor Section — ······················ 23

4-8. Schematic Diagram — Motor Section — ························ 25 4-9. Schematic Diagram — Panel Section — ························· 27 4-10. Printed Wiring Board — Panel Section — ······················· 29 4-11. Printed Wiring Board — Main Section — ······················· 32 4-12. Schematic Diagram — Main Section — ·························· 35

4-13. IC Block Diagrams ··················································· ········

4-14. IC Pin Function ··················································· ·········

SERVICING NOTE

•Supplying power during servicing

This equipment cannot operate without using a separate power supply. Connect to the STR-W550/W770AV when performing service work.

To apply power set the SYSTEM POWER switch on the Tuner/Amp to ON. When other units are not available use the PFJ-1 power supply jig.

When using the PFJ-1, simultaneously press the CD STOP button and the DECK A )(fast rightward) button to turn on the power.

[Connection Diagram]		PFJ-1
		(Power Supply Jig)		Connector Cable 17P
				(Supplied with set)
		POWER SW					Set
	FH-E939,838,737,
	MHC-6600,5600,
					CNB108 17P
	CDP/TC			Conversion Board
					SYSTEM CONTROL
				(J-2501-138-A)

— 2 —

SECTION 1

GENERAL

1 23

4 5 6

7

8

9

@°						!¼
@¢						!Á
@£						!ª

@Á

!»

!¦

!°

!£

@ª

@¼

!

¥

!¤

!¢

1	DISC SKIP EX-CHANGE Button (CD)	!¢ 0Button [B] (DECK)
2	0 Button (CD)	!° DIRECTION MODE Button (DECK)
3	) Button (CD)	!¤ PAUSE Button (DECK)
4	DISC 1 Button (CD)	!¦ REC Button (DECK)
5	DISC 2 Button (CD)	!¥ HI-SPEED DUBBING Button (DECK)
6	DISC 3 Button (CD)	!» CD SYNCHRO Button (DECK)
7	6 OPEN/CLOSE Button (CD)	@¼ DOLBY NR Button (DECK)
8	áPButton (CD)	@Á )Button [A] (DECK)
9	p Button (CD)	@ª 0Button [A] (DECK)
!¼ á Button [B] (DECK)		@£ ¹Button [A] (DECK)
!Á » Button [B] (DECK)		@¢ »Button [A] (DECK)
!ª ¹ Button [B] (DECK)		@° áButton [A] (DECK)
!£ ) Button [B] (DECK)

— 3 —

SECTION 2

DISASSEMBLY

Note : Follow the disassembly procedure in the numerical order given.

2-1. BACK PANEL, CD BLOCK REMOVAL

8 CD block

7 Screw

+BVTP 3 × 10

CASE

Unscrew the five case attachment in the screws (case) (M3 × 8) × 4, (+BV 3 × 8) × 1 and remove the case.

2 Back panel

1 Screw

+BVTP 3 × 10

1 Screw

+BVTP 3 × 10

3 Flat wire (19 core)

4 CN112 (9 pin)

5 CN111 (8 pin)

6 Screw

+BVTP 3 × 10

2-2. CASSETTE LID (A)/(B) ASSY, MECHANISM DECK REMOVAL

1Press the EJECT button and open the cassette lid.

Mechanism Deck (TCM-220WR2E)

8

1

3

1

7 Screw

+BVTP 2.6 × 8

2

4 Flat wire (11 core)

5 Flat wire (21 core)

6 Screw

+BVTP 3 × 8

— 4 —

2-3. MAIN BOARD, RESISTOR BOARD, FRONT PANEL ASSY REMOVAL

		4 Bracket (H/S)
	3 Screw	5 Resistor board
	+BVTP 3 × 8

7 Main board

6 Screw

+BVTP 3 × 8

	1 Screw
2 Front panel assy	+BVTP 3 × 8

•Tray (Slide) getting out procedure on the power supply is OFF

Rotate the BU CAM assembly in the direction of the arrow and pull out the slide.

Tray (Slide)

1

BU CAM assy

— 5 —

SECTION 3

ADJUSTMENTS

3-1. MECHANICAL ADJUSTMENT

PRECAUTION

1.Clean the following parts with a denatured-alcohol-moistened

swab:
record/playback head	pinch roller
erase head	rubber belts
capstan	idlers

2.Demagnetize the record/playback head with a head demagnetizer.

3.Do not use a magnetized screwdriver for the adjustments.

4.After the adjustments, apply suitable locking compound to the parts adjusted.

5.The adjustments should be performed with the rated power supply voltage unless otherwise noted.

• Torque Measurement

	Mode	Torque Meter	Meter Reading
	Forward	CQ-102C	36 to 61g•cm
			(0.50 – 0.84 oz•inch)
	Forward	CQ-102C	2 to 6g•cm
	Back Tension		(0.028 – 0.083 oz•inch)
	Reverse	CQ-102RC	36 to 61g•cm
			(0.50 – 0.84 oz•inch)
	Reverse	CQ-102RC	2 to 6g•cm
	Back Tension		(0.028 – 0.083 oz•inch)
	FF, REW	CQ-201B	61 to 143g•cm
			(0.85 – 1.99 oz•inch)
	• Tape Tension Measurement
	Mode	Tension Meter	Meter Reading
	Forward	CQ-403A	more than 100 g (3.53 oz)
	Reverse	CQ-403R	more than 100 g (3.53 oz)

3-2. ELECTRICAL ADJUSTMENT

DECK SECTION

1.The adjustment should be performed in the publication. (Be sure to make playback adjustment at first.)

2.The adjustment and measurement should be performed for both

L-CH and R-CH.
• Switch position
DOLBY NR switch	: OFF
FUNCTION button	: OFF
EFFECT switch	: OFF
DBFB switch	: OFF

3.Deck section electrical adjustments are made in test mode by press key switch same time CD STOP DECK A STOP and DECK B STOP button.

4.Input point and output level measurement point.

•Test Tape

Tape				Signal		Used for
P-4-A100				10 kHz, –10 dB		Head Azimuth Adjustment
P-4-L300				315 Hz, 0dB		Level Adjustment
WS-48B				3 kHz, 0dB		Tape Speed Adjustment
0 dB=0.775V
Record/Playback Head Azimuth Adjustment
DECK A			DECK B

Procedure:

1.Forward Playback mode Reverse Playback mode

— 6 —

2.Turn the adjustment screw for the maximum output levels. If these levels do not match, turn the adjustment screw until both of output levels match together within 1 dB.

3.Playback Mode

4.Change the playback mode and repeat the steps 1 to 3.

5.After the adjustment, lock the adjustment screw with suitable locking compound.

Adjustment Location:

— Record/playback head (Deck A and B) —

Tape Speed Adjustment DECK A DECK B

Note: Start the Tape Speed adjustment as below after setting to the test mode.

Set to test mode. (Press key switch same time CD STOP DECK A STOP and DECK B STOP button.)

Test mode off. (Power off.)

Procedure:

• Perform high speed adjustment before normal speed adjustment. Mode: Playback

	Speed Deck		Adjustment	Frequency counter
	*High	A	RV652	5,910 to 6,090 Hz
		B	RV652
	Normal	A	RV651	2,910 to 3,090 Hz

BRV651

*Continue to press HIGH SPEED DUBBING switch (S259) in playback mode : High speed playback.

Frequency difference between the beginning and the end of the tape should be within ± 3%.

Frequency difference between deck A and deck B the beginning of the tape should be within 1.5 %.

Adjustment Location: AUDIO board (See page 8)

Sample Value of Wow and flutter

W.RMS (JIS) within 0.3% (test tape: WS-48B)

Playback level Adjustment DECK A DECK B

Procedure:

— FWD playback Mode —

	test tape
	P-4-L300	VTVM
	(315 Hz, 0 dB)
	set	+
		–

Output level measurement point (See page 6)

Deck A is RV311 (L-CH) and RV411 (R-CH), Deck B is RV301 (L-CH) and RV401 (R-CH) so that adjustment within adjustment level as follows.

Adjustment Level:

LINE OUT level : –8.2 to –7.2 dB (301.5 to 338.3 mV) Level Difference between Channels : within 0.5 dB

Confirm the OUTPUT level does not change in playback mode while changing the mode from playback to stop several times.

Adjustment Location: AUDIO board (See page 8)

— 7 —

Record Bias Adjustment DECK B

Procedure:

1.Record mode

1)315 Hz üý69.0mV (–23.8dB) : STR-W550/W770AV

2)10 kHz þ38.8mV (–26dB) : jig (PFJ-1)

AF OSC	blank tape
	CS-123
	attenuator
	set

Input point (See page 6)

2.Mode: Playback

Adjustment Level:

OUTPUT level: –23.8 dB ± 1.0 dB (56.1 to 44.6 mV)

Adjustment Location: MAIN board

Adjustment Location :

[AUDIO BOARD] — Component Side —

RV301 : Playback Level (Deck B L-CH)

RV401 : Palyback Level RV651 : Tape Speed (Normal)

(Deck B R-CH)

	RV652 : Tape Speed
	(Hight)
RV341 : Record Bias (L-CH)	RV311 : Playback Level
	(Deck A L-CH)
RV441 : Record Bias (R-CH)
RV411 : Playback Level (Deck A R-CH)

3.Confirm playback the signal recorded in step 1 become adjustment level as follows.

4.If these levels do not adjustment level, adjustment the RV341 (L-CH) and RV441 (R-CH) to repeat steps 1 and 4.

Adjustment level: Playback output of 315 Hz to playback output of 10 kHz: 0 ± 1.0 dB (0 ± 4.5mV).

Adjustment Location: AUDIO board

Record Level Adjustment DECK B

Procedure:

1.Record mode

2.Playback mode

3.Confirm playback the signal recorded in step 1 become adjustment level as follows.

4.If these levels do not adjustment level, adjustment the RV401 (L-CH) and RV451 (R-CH) to repeat steps 1 and 4.

[MAIN BOARD] — Component Side —

RV451 Record Level (R)

CNB108

RV401 Record Level (L)

— 8 —

CD SECTION

Note :

1.CD Block is basically designed to operate without adjustment. Therefore, check each item in order given.

2.Use YEDS-18 disc (3-702-101-01) unless otherwise indicated.

3.Use an oscilloscope with more than 10M impedance.

4.Clean the object lens by an applicator with neutral detergent when the signal level is low than specified value with the following checks.

Focus Bias check

Procedure:

1.Connect oscilloscope to test point TP (RF). (GND terminal : VC)

2.Turned Power switch on.

3.Put disc (YEDS-18) in and playback.

4.Confirm that the shape “ ” can be clearly distinguished at the center of the waveform and check the RF signal level.

• RF signal

S Curve Check

Procedure:

1.Connect oscilloscope to test point TP (FEO).

2.Connect between test point TP (FOK) and GND by lead wire.

3.Turn Power switch on.

4.Put disc (YEDS-18) in and turned Power switch on again and actuate the focus search. (actuate the focus search when disc table is moving in and out.)

5.Check the oscilloscope waveform (S-curve) is symmetrical between A and B. And confirm peak to peak level within 3±1 Vp-p.

S-curve waveform

6.After check, remove the lead wire connected in step 2.

Note: • Try to measure several times to make sure than the ratio of A : B or B : A is more than 10 : 7.

• Take sweep time as long as possible and light up the brightness to obtain best waveform.

RF Level Check

Procedure:

1.Connect oscilloscope to test point TP (RF) on BD board.

2.Turned Power switch on.

3.Put disc (YEDS-18) in and playback.

4.Confirm that oscilloscope waveform is clear and check RF signal level is correct or not.

Note:

Clear RF signal waveform means that the shape “ ” can be clearly distinguished at the center of the waveform.

• RF signal

— 9 —

E-F Balance (1 Track Jump) check (Without remote commander)

Procedure:

1.Connect oscilloscope to test point TP (TEO) on BD board.

2.Turned Power switch on.

3.Put disc (YEDS-18) in to play the number five track.

4.Press the “P (Pause)” button. (Becomes the 1 track jump mode)

5.Check the level B of the oscilloscope's waveform and the A (DC voltage) of the center of the Traverse waveform. Confirm the following:

A – B × 100 = ±7 (%) 2 (A + B)

1 track jump waveform

Center of the waveform

B

A (DC voltage)

0V

symmetry level : 500 mV ± 100 mVp-p

Adjustment Location:

[BD BOARD] (Conductor Side)

CNU101

TEO

GND

RF

VC

		FOK
	IC101	IC
		I02

FEO

IC103

CNU102

— 10 —