SONY HCDLX7 - Service Manual Immediate Download

HCD-LX7/LX8

AEP Model

UK Model

HCD-LX7

E Model

Australian Model

HCD-LX8

SPECIFICATIONS

Photo: HCD-LX8

COMPACT HiFi STEREO SYSTEM

-- Continued on next page --

Model Name Using Similar Mechanism

HCD-DR4/XB500

CD Mechanism Type

CDM37M-5BD32L

Base Unit Type

BU-5BD32L

Optical Pick-up Type

KSS-213D/Q-NP

Model Name Using Similar Mechanism

HCD-GRX10AV/RX110AV

Tape Transport Mechanism Type

TCM-230PWR1

SECTION

TAPE DECK

SECTION

SERVICE MANUAL

HCD-LX7/LX8 is the tuner, deck, CD and

amplifier section in LBT-LX7/LX8.

CAUTION

Use of controls or adjustments or performance of procedures

other than those specified herein may result in hazardous ra-

diation exposure.

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.

Flexible Circuit Board Repairing

· Keep the temperature of soldering iron around 270°C

during repairing.

· Do not touch the soldering iron on the same conductor of the

circuit board (within 3 times).

· Be careful not to apply force on the conductor when soldering

or unsoldering.

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.

Laser component in this product is capable of emitting radiation

exceeding the limit for Class 1.

This appliance is classified as

a CLASS 1 LASER product.

The CLASS 1 LASER PROD-

UCT MARKING is located on

the rear exterior.

This caution

label is located

inside the unit.

MODEL

PARTS No.

LX7: AEP, UK, CIS model

4-225-529-1s

LX8: E, AR model

4-225-529-2s

LX8: SP, MY model

4-225-529-3s

LX8: MX model

4-225-529-4s

LX8: AUS model

4-225-529-5s

LX8: EA model

4-225-529-6s

NOTES ON HANDLING THE OPTICAL PICK-UP BLOCK

OR BASE UNIT

The laser diode in the optical pick-up block may suffer electrostatic

break-down because of the potential difference generated by the

charged electrostatic load, etc. on clothing and the human body.

During repair, pay attention to electrostatic break-down and also

use the procedure in the printed matter which is included in the

repair parts.

The flexible board is easily damaged and should be handled with

care.

NOTES ON LASER DIODE EMISSION CHECK

The laser beam on this model is concentrated so as to be focused on

the disc reflective surface by the objective lens in the optical pick-

up block. Therefore, when checking the laser diode emission, ob-

serve from more than 30 cm away from the objective lens.

LASER DIODE AND FOCUS SEARCH OPERATION

CHECK

Carry out the "S curve check" in "CD section adjustment" and check

that the S curve waveform is output four times.

MODEL IDENTIFICATION

-- BACK PANEL --

· Abbreviation

: Singapore model

: Mexican model

AUS : Australian model

: Saudi Arabia model

: Argentine model

: Malaysia model

Parts No.

7. EXPLODED VIEWS

7-1. Case and Back Panel Section .............................................. 53

7-2. Front Panel Section 1 .......................................................... 54

7-3. Front Panel Section 2 .......................................................... 55

7-4. Chassis Section ................................................................... 56

7-5. TC Mechanism Section 1 (TCM230PWR1) ....................... 57

7-6. TC Mechanism Section 2 (TCM230PWR1) ....................... 58

7-7. CD Mechanism Section (CDM37M-5BD32L) ................... 59

7-8. Base Unit Section (BU-5BD32L) ....................................... 60

8. ELECTRICAL PARTS LIST ........................................ 61

1. SERVICING NOTE .......................................................... 5

2. GENERAL .................................................................... 9

3. DISASSEMBLY

3-1. Front Panel .......................................................................... 11

3-2. Main Board ......................................................................... 11

3-3. Sub Panel ............................................................................ 12

3-4. CD LID Assembly .............................................................. 12

3-5. Tape Mechanism Deck and Cassette LID ........................... 12

3-6. CD Mechanism Deck .......................................................... 13

3-7. Base Unit ............................................................................. 13

3-8. Disc Table ........................................................................... 13

4. MECHANICAL ADJUSTMENTS .......................... 14

5. ELECTRICAL ADJUSTMENTS ............................... 14

6. DIAGRAMS

6-1. Circuit Boards Location ...................................................... 17

6-2. Block Diagrams

· BD (CD) Section .............................................................. 18

· Deck Section .................................................................... 19

· Main (1/2) Section ........................................................... 20

· Main (2/2) Section ........................................................... 21

· Power Section (LX8 model) ............................................ 22

· Power Section (LX7 model) ............................................ 23

· Display Section ................................................................ 24

6-3. Printed Wiring Board BD (CD) Section ....................... 26

6-4. Schematic Diagram BD (CD) Section .......................... 27

6-5. Printed Wiring Board Main Section .............................. 28

6-6. Schematic Diagram Main (1/3) Section ........................ 29

6-7. Schematic Diagram Main (2/3) Section ........................ 30

6-8. Schematic Diagram Main (3/3) Section ........................ 31

6-9. Schematic Diagram Deck Section ................................. 32

6-10. Printed Wiring Board Deck Section ........................... 33

6-11. Schematic Diagram Power Section ............................ 34

6-12. Printed Wiring Board Power Section ......................... 35

6-13. Schematic Diagram Panel FL Section ........................ 36

6-14. Printed Wiring Board Panel FL Section ..................... 37

6-15. Schematic Diagram Panel VR Section ....................... 38

6-16. Printed Wiring Board Panel VR Section .................... 39

6-17. Schematic Diagram TC Panel Section ....................... 40

6-18. Printed Wiring Board TC Panel Section ..................... 41

6-19. Schematic Diagram CD Panel Section ....................... 42

6-20. Printed Wiring Board CD Panel Section .................... 43

6-21. Schematic Diagram CD Motor Section ...................... 44

6-22. Printed Wiring Board CD Motor Section ................... 45

6-23. Schematic Diagram Trans Section (LX7 model) ....... 46

6-24. Printed Wiring Board Trans Section (LX7 model) ..... 47

6-25. Schematic Diagram Trans Section (LX8 model) ....... 48

6-26. Printed Wiring Board Trans Section (LX8 model) ..... 49

6-27. Schematic Diagram Leaf SW Section ........................ 49

6-28. Printed Wiring Board Leaf SW Section ..................... 49

6-29. IC Block Diagrams ........................................................... 50

6-30. IC Pin Functions ............................................................... 50

TABLE OF CONTENTS

SECTION 1

SERVICING NOTE

About CD-TEXT display

This unit is provided with a simple CD-TEXT display function.

The CD-TEXT contents of 20 tracks are displayed on the fluorescent display tube.

Since the function is simple, some special characters may not be displayed, or may be displayed as other characters.

MC Cold Reset

· The cold reset clears all data including preset data stored in the RAM to initial conditions. Execute this mode when returning the set to the

customer.

Procedure:

1. Press three buttons c/CLOCK SET , ENTER , and "/1 simultaneously.

2. "COLD RESET" is displayed on the fluorescent display tube and reset is executed.

CD Delivery Mode

· This mode moves the pick-up to the position durable to vibration. Use this mode when returning the set to the customer after repair.

Procedure:

1. Press "/1 button to turn the set ON.

2. Press LOOP button and "/1 button simultaneously.

3. A message "LOCK" is displayed on the fluorescent indicator tube, and the CD delivery mode is set.

MC Hot Reset

· This mode resets the set with the preset data kept stored in the memory. The hot reset mode functions same as if the power cord is plugged

in and out.

Procedure:

1. Press three buttons c/CLOCK SET , ENTER , and DISC 1 simultaneously.

2. The fluorescent indicator tube becomes blank instantaneously, and the set is reset.

Sled Servo Mode

· This mode can run the CD sled motor freely. Use this mode, for instance, when cleaning the pick-up.

Procedure:

1. Press "/1 button to turn the set ON.

2. Press three buttons c/CLOCK SET , ENTER , and DISC 5 simultaneously.

3. The Sled Servo mode is selected, if "CD" is blanking on the fluorescent indicator tube.

4. With the CD in stop status, When the . AMS > knob is rotated in the clockwise direction, the pick-up moves outside. When

rotated counterclockwise, it moves inside.

5. To exit from this mode, perform as follows:

1) Move the pick-up to the most inside track.

2) Execute MC cold reset. (Press the three buttons c/CLOCK SET , ENTER , and "/1 button simultaneously.)

Note:

· Always move the pick-up to most inside track when exiting from this mode. Otherwise, a disc will not be unloaded.

· Do not run the sled motor excessively, otherwise the gear can be chipped.

Change-over of AM Tuner Step between 9kHz and 10kHz

· A step of AM channels can be changed over between 9kHz and 10kHz.

Procedure:

1. Press "/1 button to turn the set ON.

2. Select the function "TUNER", and press TUNER/BAND button to select the BAND "AM".

3. Press "/1 button to turn the set OFF.

4. Press ENTER and "/1 buttons simultaneously, and the display of fluorescent indicator tube changes to "AM 9k STEP" or "AM 10k

STEP", and thus the channel step is changed over.

LED and Fluorescent Indicator Tube All Lit, Key Check Mode

Procedure:

1. Press three buttons c/CLOCK SET , ENTER , and DISC 2 simultaneously.

2. LEDs and fluorescent indicator tube are all turned on.

Press DISC 2 button, and the key check mode is activated.

3. In the key check mode, the fluorescent indicator tube displays "K @ V0 J0". Each time a button is pressed, "K"value increases. However,

once a button is pressed, it is no longer taken into account.

"J" Value increases like 1, 2, 3 ... if rotating . AMS > knob in "+" direction, or it decreases like 0, 9, 8 ... if rotating in "-"

direction.

"V" Value increases like 1, 2, 3 ... if rotating VOLUME knob in "+" direction, or it decreases like 0, 9, 8 ... if rotating in "-" direction.

4. To exit from this mode, press three buttons in the same manner as step 1, or disconnect the power cord.