Sony HCD-XB88AVK, HCD-XB88K Service Manual

MICROFILM

HCD-XB88AVK/XB88K

SERVICE MANUAL

HCD-XB88AVK/XB88K is the tuner, deck, CD and amplifier section in LBT -XB88A VK/XB88K.

Photo: HCD-XB88AVK

Model Name Using Similar Mechanism HCD-D670AV/N555AV CD Mechanism Type CDM37L-5BD29AL

SECTION

TAPE

DECK

SECTION

Base Unit Type BU-5BD29AL Optical Pick-up Type KSS-213D/Q-NP Model Name Using Similar Mechanism HCD-D670AV/N555AV Tape Transport Mechanism Type TCM-220WR2

E Model

CDM37LH-5BD29AL

SPECIFICATIONS

COMPACT DISC DECK RECEIVER

— Continued on next page —

– 1 –

CAUTION

Use of controls or adjustments or performance of procedures other than those specified herein may result in hazardous radiation exposure.

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 repain 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 pickup block. Therefore, when checking the laser diode emission, observe from more than 30 cm away from the objective lens.

LASER DIODE AND FOCUS SEARCH OPERATION CHECK

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.

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 PR ODUCT MARKING is located on the rear exterior.

The following caution label is located inside of the unit.

Carry out the “S curve check” in “CD section adjustment” and check that the S curve waveform is output three times.

MODEL IDENTIFICATION — BACK PANEL —

Parts No.

SAFETY-RELATED COMPONENT WARNING !!

COMPONENTS IDENTIFIED BY MARK ! OR DO TTED LINE WITH MARK ! 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 –

XR88AVK : SP, MY model XR88AVK : E, IA model XR88AVK : EA model XR88K : TH model

• Abbreviation EA : Saudi Arabia model SP : Singapore model MY : Malaysia model TH : Thai model IA : Indonesian model

PARTS No.MODEL

4-996-861-1π 4-996-861-6π 4-996-861-7π 4-996-861-9π

TABLE OF CONTENTS

1. GENERAL .......................................................................... 4

2. DISASSEMBLY

2-1. Front Panel ........................................................................... 6

2-2. Main Board ........................................................................... 6

2-3. Tape Mechanism Deck ..........................................................7

2-4. Cassette Lid Assembly.......................................................... 7

2-5. CD Lid Assembly.................................................................. 8

2-6. CD Mechanism Deck ............................................................ 8

2-7. Base Unit ..............................................................................8

2-8. Disc Table .............................................................................9

3. SERVICE MODE ............................................................10

4. MECHANICAL ADJUSTMENTS ..........................12

5. ELECTRICAL ADJUSTMENTS ............................... 12

6. DIAGRAMS

6-1. Circuit Boards Location ...................................................... 16

6-2. Block Diagrams

• CD Section ....................................................................... 17

• Deck Section .................................................................... 19

• Main Section .................................................................... 21

• Power Section ..................................................................23

• Key Con Section ..............................................................25

6-3. Schematic Diagram – Key Con Section –........................... 29

6-4. Printed Wiring Board – Key Con Section – ........................ 30

6-5. Printed Wiring Board – CD Section –................................. 31

6-6. Schematic Diagram – CD Section – ................................... 33

6-7. Printed Wiring Board – Main Section – .............................. 35

6-8. Schematic Diagram – Main (1/5) Section – ........................ 37

6-9. Schematic Diagram – Main (2/5) Section – ........................ 39

6-10. Schematic Diagram – Main (3/5) Section – ..................... 41

6-11. Schematic Diagram – Main (4/5) Section – ..................... 43

6-12. Schematic Diagram – Main (5/5) Section – ..................... 45

6-13. Printed Wiring Board – Deck Section – ........................... 47

6-14. Schematic Diagram – Deck Section – .............................. 49

6-15. Printed Wiring Board – Power Section – ......................... 51

6-16. Schematic Diagram – Power Section – ............................53

6-17. Schematic Diagram – Panel Section – ............................. 55

6-18. Printed Wiring Board – Panel Section –........................... 57

6-19. Printed Wiring Board – TC/CD Panel-1 Section –........... 59

6-20. Schematic Diagram – TC/CD Panel-1 Section – ............. 61

6-21. Schematic Diagram – HP/Mic Section – ..........................63

6-22. Printed Wiring Board – HP/Mic Section –....................... 65

6-23. Printed Wiring Board – CD Motor Section –...................67

6-24. Schematic Diagram – CD Motor Section – ......................69

6-25. Printed Wiring Board – Trans Section – ........................... 71

6-26. Schematic Diagram – Trans Section – ............................. 73

6-27. Printed Wiring Board – Surround Section –..................... 75

6-28. Schematic Diagram – Surround Section – ....................... 76

6-29. IC Block Diagrams ........................................................... 77

6-30. IC Pin Functions ............................................................... 82

7. EXPLODED VIEWS

7-1. Case and Back Panel Section.............................................. 90

7-2. Front Panel Section 1 .......................................................... 91

7-3. Front Panel Section 2 .......................................................... 92

7-4. Chassis Section ................................................................... 93

7-5. TC Mechanism Section-1 (TCM-220WR2) ....................... 94

7-6. TC Mechanism Section-2 (TCM-220WR2) ....................... 95

7-7. TC Mechanism Section-3 (TCM-220WR2) ....................... 96

7-8. CD Mechanism Section

(CDM37L-5BD29AL/CMD37LH-5BD29AL) .................. 97

7-9. Base Unit Section (BU-5BD29AL) .................................... 98

8. ELECTRICAL PARTS LIST ........................................ 99

– 3 –

Front Panel

SECTION 1

GENERAL

3 4

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– 4 –

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LOCATION OF PARTS AND CONTROLS

1 1/u button 2 REC button 3 t/CLOCK SET button 4 DAILY 1 button 5 DAILY 2 button 6 SLEEP button 7 DISPLAY/DEMO button 8 SPECTRUM ANAL YZER button 9 Display Window !º ENTER/NEXT button !¡ TUNER MEMORY button !™ TUNING MODE button !£ TUNER/BAND button !¢ TUNING (+/–) button !∞ STEREO/MONO button !§ Equalizer indicators !¶ MIC LEVEL knob !• MIC 1, MIC 2 jack !ª ECHO LEVEL knob @º DSP button @¡ WAVE button @™ PROLOGIC button @£ KARAOKE PON/MPX button @¢ P FILE MEMORY button @∞ PHONES jack @§ EFFECT button @¶ FUNCTION button @• GROOVE button @ª VOLUME control #º SUPER WOOFER button #¡ GEQ control buttons #™ GEQ CONTROL button #£ SUPER W MODE button #¢ ENTER button #∞ Deck A ª, · button #§ Deck A p button #¶ DIRECTION button #• DOLBY NR button #ª Deck A 0, ) button $º Deck A 6 EJECT button $¡ Deck B p button $™ Deck B ª, · button $£ Deck B 0, ) button $¢ Deck B r REC button $∞ Deck B P button $§ CD SYNC button $¶ H SPEED DUB button $• Deck B 6 EJECT button $ª 6 OPEN button %º CD · button %¡ CD p button %™ CD P button %£ DISC SKIP button %¢ DISC1-DISC5 buttons %∞ NON-STOP button %§ LOOP button %¶ FLASH button %• 1/ALL DISCS button %ª PLAY MODE button ^º CD 0, ) button ^¡ REPEAT button ^™ EDIT button ^£ ≠ AMS ± dial

– 5 –

SECTION 2

)

DISASSEMBLY

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

2-1. FRONT PANEL

Three flat type wiers

(CN401,CN402,CN701)

Front panel

2-2. MAIN BOARD

Power cord

Four screws (BVTP3x8)

Back panel

Thirteen screws (BVTP3x8)

Flat type wire (CN1)

Main board

!º

Connector (CN961

Flat type wire (CN801)

– 6 –

Connector (CN901)

Two screws (BVTP3x8)

Connector (CN830)

2-3. TAPE MECHANISM DECK

Three screws (BVTP2.6x8)

Remove the tape mechanism deck

section to direction of arrow

Open the cassette lid.

2-4. CASSETTE LID ASSEMBLY

Two springs.

Push the two buttons.

Two brackets.

Two screws (BVTP2.6x8)

Cassette lid assembly

– 7 –

2-5. CD LID ASSEMBLY

)

Connector (CN671)

Four screws (BVTP2.6x8)

CD lid assembly

Connector (CN661

2-6. CD MECHANISM DECK

Five screws (BVTP3x8)

CD mechanism

deck

2-7. BASE UNIT

Boss

Base unit

Yoke bracke

– 8 –

2-8. DISC TABLE

NOTE:

When the disc table is installed, adjust the positions of roller cam and mark ” as shown in the figure, then set to

the groove of disc table.

Screw (BVTP3X8)

Bracket (BU)

Screw (BVTP3X8)

Stop screw

Disc tabl

– 9 –

SECTION 3

SERVICE MODE

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 SPECTRUM ANALYZER , ENTER , and DISC 1 simultaneously.

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

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/u button to turn the set ON.

2. Press PLAY MODE button and 1/u 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 po wer cord is plugged in and out.

Procedure:

1. Press three buttons SPECTRUM ANALYZER , ENTER , and DISC 2 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. Select the function “CD”.

2. Press three buttons SPECTRUM ANALYZER , ENTER , and FUNCTION simultaneously.

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

4. With the CD in stop status, press ) button in CD section to move the pick-up to outside track, or 0 button to inside track.

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

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

2) Press three buttons in the same manner as step 2.

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 FUNCTION Name

• The FUNCTION name of external input terminal can be changed over to VIDEO or MD. With the FUNCTION selected to “MD”, about 5dB mute is applied to the input gain.

Procedure:

1. Press 1/u button to turn the set OFF.

2. Press 1/u button together with FUNCTION button, and the power is turned on, the display of fluorescent indicator tube changes to

“MD” or “VIDEO” instantaneously, and thus the FUNCTION is changed over.

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/u button to turn the set ON.

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

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

4. Press ENTER/NEXT and 1/u buttons simultaneously , and the displa y 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 SPECTRUM ANALYZER , ENTER , and DISC 3 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 1 V0 J0”. Each time a button is pressed, “K”v alue increases. Howe ver ,

once a button is pressed, it is no longer taken into account. “J” Value increases like 1, 2, 3 ... if rotating JOG 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.

– 10 –

Aging Mode

This mode can be used for operation check of CD section and tape deck section.

• If an error occurred: The aging operation stops.

• If no error occurs: The aging operation continues repeatedly.

1. Aging Mode in CD Section

1-1. Operating procedure of Aging Mode

1. Set discs in DISC 1 and DISC 3 trays.

2. Select the function “CD”.

3. Press three buttons SPECTRUM ANALYZER , ENTER , and KARAOKE PON/MPX simultaneously.

4. The aging mode is activated, if a roulette mark on the fluorescent indicator tube is blinking.

5. In the aging mode, the aging is executed in a sequence given in “1-2. Operation during Aging Mode”.

The aging continues unless an alarm occurred.

6. To exit from the aging mode, press 1/u button to turn the set OFF.

• If a button other than buttons In CD section is pressed during aging, the aging in the CD section is finished.

• To execute aging to the tape deck section successively, press · button in the deck A.

“AGING” is displayed on the fluorescent indicator tube. (For the aging in tape deck, see “2. Aging Mode in Tape Deck Section”.

1-2. Operation during aging Mode In the aging mode, the program is executed in the following sequence.

1. The disc tray turns to select a disc. (For a disc selection sequence, see Section 1-3.)

2. TOC of disc is read.

3. The pick-up accesses to the last track.

4. Steps 1 through 3 are repeated.

1-3. Disc Selection Sequence

• During the aging mode, discs are selected in the following sequence:

Disc 1 → Disc 3

↑↓

Disc 3 ← Disc 1

2. Aging Mode in Tape Deck Section

2-1. Operating procedure of Aging Mode

1. Load a commercially available 10-minute tape into the decks A and B respectively.

(If a 10-minute tape is not available, another tape may be used but a cycle time will be longer.)

2. Select the function “TAPE”.

3. Rewind tapes in advance by pressing 0 button respectively on decks A and B.

4. Press three buttons SPECTRUM ANALYZER , ENTER , and KARAOKE PON/MPX simultaneously.

5. Press · button on deck A. (This button triggers the aging mode.)

6. The aging mode is activated if “AGING A” is displayed on the fluorescent indicator tube.

7. In the aging mode, the aging is executed in a sequence given in “2-2. Operation during Aging Mode”.

The aging continues unless an alarm occurred.

8. To exit from the aging mode, press 1/u button to turn the set OFF.

2-2. Operation during Aging Mode In the aging mode, the program is executed in the following sequence.

1. A tape on FWD side is played for one minute.

2. PAUSE STOP is made.

3. Recording is made for 3 minutes. (For the deck not having the record function, the play is executed.)

4. FF is executed up to the end of tape.

5. A tape is reversed, and the tape on REV side is played for one minute.

6. PAUSE STOP is made.

7. Recording is made for 3 minutes. (For the deck not having the record function, the play is executed.)

8. FF is executed up to the end of tape.

9. Steps 1 through 8 are executed for the other deck.

10. Steps 1 through 9 are repeated unless an alarm occurred.

2-3. Deck Selection Sequence

• During the aging mode, decks are selected in the following sequence:

Deck A (FWD) → Deck A (REV)

↑↓

Deck B (REV) ← Deck B (FWD)

– 11 –

SECTION 4

MECHANICAL ADJUSTMENTS

SECTION 5

ELECTRICAL ADJUSTMENTS

Precaution

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

record/playback heads pinch rollers 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

FWD

FWD back tension

REV

REV back tension

FF/REW

FWD tension

REV tension

Torque meter

CQ-102C

CQ-102RC

CQ-201B

CQ-403A

CQ-403R

Meter reading

36 to 61 g • cm

(0.5 - 0.84 oz • inch)

2 to 6 g • cm

(0.02 - 0.08 oz • inch)

36 to 61 g • cm

(0.5 - 0.84 oz • inch)

2 to 6 g • cm

(0.02 - 0.08 oz • inch)

61 to 143 g • cm

(0.85 - 1.99 oz • inch)

100 g or more

(3.53 oz or more)

100 g or more

(3.53 oz or more)

DECK SECTION 0 dB=0.775V

1.Demagnetize the record/playback head with a head damagnetizer.

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

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

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

5.The adjustments should be performed in the order given in this service manual. (As a general rule, playback circuit adjustment should be completed before performing recording circuit adjustment.)

6.The adjustments should be performed for both L-CH and R-CH.

7.Switches and controls should be set as follows unless otherwise specified.

Signal

P-4-A100

WS-48B

P-4-L300

10 kHz, –10 dB

3 kHz, 0 dB

315 Hz, 0 dB

Record/Playback Head Azimuth Adjustment (Deck A, Deck B)

Note: Perform this adjustments for both decks.

Procedure:

1.Mode : Playback

test tape P-4-A100 (10kHz, –10dB)

main board CN403 Pin

(L-CH)

(R-CH)

Used forTape

Azimuth Adjustment

Tape Speed Adjustment

Level Adjustment

level meter

set

main board CN403 Pin

(GND)

– 12 –

2. Turn the adjustment screw and check output peaks. If the peaks do not match for L-CH and R-CH, turn the adjustment screw

that outputs match within 1 dB of peak.

L-CH peak

output level

within 1 dB

within 1dB

Tape Speed Adjustment (Deck A)

Note: Set the test mode using the following method and begin tape

speed adjustment. In the test mode, the tape will move at double speed or normal speed each time the H SPEED DUB. button is pressed.

Procedure :

With the power turned ON, press the SPECTRUM ANALYZER button, ENTER button, and EFFECT button simultaneously. (The “VOLUME” on the fluorescent display tube will blink while in the test mode.) To exit the test mode, press the 1/u button.

R-CH

screw position

peak

L-CH peak

R-CH peak

screw position

3. Mode: Playback

test tape P-4-A100 (10kHz, –10dB)

in phase 45

main board CN403 Pin

(L-CH)

Pin 2 (GND)

set

(R-CH)

Waveform of oscilloscope

good

135

oscilloscope

wrong

180

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

Adjustment Location: Playback Head (Deck A)

Record/Playback/Erase Head (Deck B)

1. Load WS-48B into deck B.

2. Play deck B.

3. Press the H SPEED DUB. button and play the tape at double speed.

4. Adjust RV652 of the AUDIO boar d so that the reading of the frequency counter becomes 6000 ± 180 Hz.

5. Press the H SPEED DUB. button and play the tape at normal speed.

6. Adjust RV651 of the AUDIO boar d so that the reading of the frequency counter becomes 3000 ± 90 Hz.

Adjustment Location: A UDIO board

Sample Value of Wow and flutter

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

Playback Level Adjustment (Deck A, Deck B)

Procedure:

Mode: Playback

test tape P-4-L300 (315Hz, 0dB)

set

main board CN403 Pin

3 1

level meter

(L-CH) (R-CH)

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

forward

Adjustment level:

CN403 playback level: 301.5 to 338.3 mV (–8.2 to –7.2 dB) level difference between the channels: within ± 0.5 dB Adjustment Location: A UDIO board

reverse

– 13 –

Record Bias Adjustment (Deck B)

Record Level Adjustment (Deck B)

Procedure:

INTRODUCTION

When set to the test mode performed in Tape Speed Adjustment, when the tape is rewound after r ecording, the “REC memory

mode” which rewinds only the recorded portion and playback is set. This “REC memory mode” is convenient for performing this adjustment. During recording, the input signal FUNCTION will automatically switch to VIDEO.

1. Press FUNCTION button to select VIDEO. (This step is not necessary if the above test mode has already been set.)

2. Load a tape into deck B, and press the r REC button.

3. Mode: Record

VIDEO/MD (AUDIO) IN

1) 315 Hz

2) 10 kHz

AF OSC

attenuator

} 50 mV (–23.8 dB)

600

Ω

blank tape CS-123

set

4. Mode: Playback

recorded position

level meter

Procedure:

INTRODUCTION

When set to the test mode performed in Tape Speed Adjustment, when the tape is rewound after recording, the “REC memory

1. Press FUNCTION button to select VIDEO. (This step is not necessary if the above test mode has already been set.)

2. Load a tape into deck B, and press the r REC button.

3. Mode: Record

VIDEO/MD (AUDIO) IN

1) 315 Hz

2) 10 kHz

AF OSC

attenuator

600

Ω

} 50 mV (–23.8 dB)

blank tape CS-123

set

4. Mode: Playback

recorded position

level meter

set

main board CN403 Pin

(L-CH)

(R-CH)

5. Confirm playback the signal recorded in step 2 become adjustment level as follows. If these levels do not adjustment le vel, adjust the R V341 (L-CH) and R V441 (R-CH) on the A UDIO board to repeat steps 3 and 4.

Adjustment level: The playback output of 10 kHz le vel difference

against 315 Hz reference should be ± 1.0 dB.

Adjustment Location: A UDIO board

Adjustment Location [AUDIO BOARD] (Conductor Side)

RV341(Lch),RV441(Rch) Record Bias

RV301 RV401

RV301(Lch),RV401(Rch) Playback Level (Deck B)

RV441

RV341

RV651 (Normal Speed) RV652 (High Speed) Tape Speed

RV311(Lch),RV411(Rch) Playback Level (Deck A)

RV651

RV311 RV411

RV652

set

main board CN403 Pin

(L-CH)

(R-CH)

5. Confirm playback the signal recorded in step 2 become adjustment level as follows. If these levels do not adjustment level, adjust the R V301 (L-CH) and RV351 (R-CH) on the MAIN board to repeat steps 3 and 4.

Adjustment level:

CN403 playback level: 47.2 to 53.0 mV (–24.3 to –23.3 dB)

Adjustment Location: MAIN board

[MAIN BOARD] (Component Side)

RV301 Record Level (L CH)

1 CN403

IC401

RV351 Record Level (R CH)

– 14 –

CD SECTION

Note:

1. CD Block is basically constructed 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 10MΩ 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.

S Curve Check

oscilloscope

BD board

TP (FEO) TP (VC)

Procedure :

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

2. Connect between test point TP (FOK) and Ground 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 conf irm peak to peak level within 3 ± 1Vp-p.

E-F Balance (1 Track Jump) check

oscilloscope

BD board

TP (TEO) TP (VC)

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.

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 x 100 = less then ± 7 (%)

• B = 500 ± 100 mVp-p

1 track jump waveform

Center of the waveform

A (DC voitage)

S-curve waveform

symmetry

Within 3

1 Vp-p

6. After check, remove the lead wire connected in step 2. Note: • Try to measure several times to make sur e than the ratio of

A : B or B : A is more than 10 : 7.

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

RF Level Check

oscilloscope

BD board

TP (RF) TP (VC)

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.

level : 500 mV

100 mVp-p

Adjustment Location:

[BD BOARD] (Conductor Side)

TP (RF)

IC101

CN101

(TEO)

TP (FEO)

TP (GND)

IC103

IC102

(VC)

TP (FOK)

IC102

Symmetry

RF signal waveform

VOLT/DIV : 200mV TIME/DIV : 500ns

level : 1.3

0.3 Vp-p

– 15 –

6-1. CIRCUIT BOARDS LOCATION

SECTION 6

DIAGRAMS

TRANS board

HP/MIC board

TC-A SW board

CD-LED board

CD-A SW board

DOOR SW board

PANEL board

TC-B SW board

CD-B2 SW board

ENCAPSULATED COMPONENT

SURROUND board

MAIN board

KYECON board

POWER board

CD-B1 SW board

Note: pA is including in AUDIO board.

AUDIO board

(including

TABLE SENSOR board

CD MOTOR board

MOTOR board

LEAF SWITCH boar

BD board

– 16 –

LED board

6-2. BLOCK DIAGRAMS – CD SECTION –

OPTICAL PICK-UP BLOCK

B+

LASER

DIODE

DETECTOR

HCD-XB88AVK/XB88K

IC841

D.OUT

FOCUS/TRACKING SERVO.

RF AMP

IC101 (1/2)

1 4 2 5

LD DRIVE

Q101

38 39

41 42

3637LD

PD2

F E

TEO

TEI

PD1

FEI

FEO

SENS1

SENS2

XRST

RF O

LOCK

C.OUT

FE O

FE M

TA M

TA O

DATA

XLT CLK

FOK

19 24 25

12 13

22 21 20

LOCK

CNIN

SEIN

DATAO

XLTO

15 16 17

CLKO

DOUT

MDP

FOK

SPOD

CD DIGITAL

OUT

OPTICAL

DIGITAL SIGNAL PROCESSOR

S101

LIMIT

IC103

DATA

10 11 12 75

XLAT

CLOK

SQCK

SENS

SCOR

SQSO

79 100

XRST

89 • 90

XTAI

LOUT1

LOUT2

16.9344MHz

• XTAO

X101

L-CH

R-CH

CD CLK

CD DATA

SENS2

SCOR SQ DATA

SQ CLK

SENS

M102

SLED MOTOR

M101

SPINDLE

MOTOR

XRST

TRACKING

FOCUS

COIL

•

COIL

2-AXIS

DEVICE

SLED/SPINDLE MOTOR DRIVE

IC102 (2/2)

SLED MOTOR

DRIVE

SPINDLE MOTOR

DRIVE

T+

–

F F+

15 16

18 17

MUTE

TRACKING

COIL DRIVE

FOCUS/TRACKING

COIL DRIVE IC102 (1/2)

FOCUS

COIL DRIVE

SLED

SERVO

IC101 (2/2)

SL P

SL O

S801

DET

TABLE

SENSOR

IC702

DISC

SENSOR

IC703

ROTARY

ENCODER

S811

Q701

TURN

MOTOR DRIVER

IC701

M701

1416

TURN

MOTOR

M801

SLIDE

MOTOR

OUT1

OUT2

4 7

MOTOR DRIVER

OUT2 OUT1

SLIDE

IC801

IN1 IN2

RIN

FIN

OPEN/CLOSE

3 6

XLAT

T. SENS

DISC SENS

ENC 1 ENC 2

ENC 3

OPEN

TBL.L TBL.R

LOAD IN

LOAD OUT

MAIN

SECTION

(Page 21)

• R CH: Same as L ch

• SIGNAL PATH : CD : Digital out

– 17 – – 18 –

HCD-XB88AVK/XB88K

– DECK SECTION –

HP101 PB HEAD (DECK A)

REC/PB HEAD

(DECK B)

HRPE101

ERASE HEAD

PB A/B

PB L

LM ON/OFF

NORM/HIGH

NR ON/OFF

REC/PB/PASS

REC L

BIAS ON/OFF

RM ON/OFF

RELAY REC/PB

CAP M ON/OFF

CAP M H / L

A SHUT

MAIN

SECTION

(Page 21)

DOLBY NR

RECOUT

NORM

24 25

S1008 B CrO

B 120/70

BIAS SW

CROM

PAS

DOL

DOLBY TYPE B

CAPSTAN

MOTOR

CN403

R CH

PB OUT

LM ON/

OFF

NORM/

HIGH

NR ON/

OFF

RIN

BIAS ON/OFF

RM ON/OFF

CAP M SWITCH

Q405, 407

SPEED

CONTROL

RV651

NORMAL

SPEED

Q651

16 17

RV652

HIGH

SPEED

SWITCH

Q406

REEL

DETECT

Q1001

S1004

A CrO

RV311

PLAYBACK

LEVEL

DECK A

RV301

PLAYBACK

LEVEL

DECK B

RV341

REC

BIAS

REC BIAS

BIAS OSC

T621, Q621, 622

IC611

R CH

ERASE BIAS

IC601

IC602

REC/PB

PB-A/B

A IN

B IN

RV301

REC LEVEL

+7.5V

EQIN

Q623, 901

EQOUT

A 120/70

120

DECK PROCESS

IC401

REEL

DETECT

Q1002

S1001 (A PLAY)

• R CH : Same as L ch

• SIGNAL PATH

+5V

S1002 (B PLAY)

: PB (DECK A) : PB (DECK B) : REC (DECK B)

OUT1

OUT2

TRIGGER

MOTOR

DRIVE IC402

TRIGGER

MOTOR

S1003

(A HALF)

S1005

(REC A)

S1006

(B HALF)

S1009

(REC B)

IN2

IN1

+5V

SWITCH

Q408, 409

B SHUT

A PLAY

B PLAY

A HALF

BHALF

TRIG H / L

B TRIG

A TRIG

– 19 – – 20 –

HCD-XB88AVK/XB88K

– MAIN SECTION –

KEY CON SECTION

(Page 25)

J101

PHONO

J101 VIDE/MD (AUDIO)

RELAY REC/PB

DECK

SECTION

(Page 20)

CAP M ON/OFF

FM/AM TUNER

TUNER UNIT IS

SUPPLIED AS

THE ASSEMBLED

BLOCK

SECTION

(Page 18)

L IN

DATA

CLK

LATCH

K CON

L OUT

PB L

REC L

A SHUT B SHUT B HALF A HALF A PLAY B PLAY

PB A / B

NORM/HIGH

BIAS ON/OFF

RM ON/OFF NR ON/OFF

REC/PB PASS

LM ON/OFF

CAP M H/L

A TRG B TRG

TRIG H/L

ST L

COM DIN

COM DATA

STEREO

TUNED

ST CE

MUTE

L CH

TBL. L TBL. R

SCOR

T. SENS

SENS 2

SENS

X RST

CD CLK

CD DATA

UP SW

SQ CLK

SQ DATA

X LAT

PHONO EQ AMP

IC101

MUTE

Q121

DOLBY PRO LOGIC

IC601

3 4 5 6

1 2 3 4

5 6

Q201

INPUT SELECT

RELAY

A SHUT

B SHUT

B HALF

A HALF

A PLAY SW

B PLAY SW

PB A/B

EQ H//N

BIAS

REC MUTE

NR ON/OFF R/P PASS

TC MUTE

93 82

CAP H/N

A TRG

B TRG

TRG LOW

CAP M ON/OFF

VOL LAT

PL LAT

COM DOUT

COM CLK

ST DIN

STEREO

TUNED

69 68

ST CE

ST MUTE

ST DOUT

K CON LAT K CON ON

TBL L

TBL R

SCOR

18 76

T SENS

SENS 2

SENS

XRST

CD CLK

CD DATA

UP SW

SQ CLK

SQ DATA IN

XLT

TRAY LED

IC103

INPUT SELECT

IC102

1 2 4 5

MUTE

CONTROL

Q123,124

INH

D+5V

D201

(DISC No.)

9 6

3 4

INPUT CHANGE

C-OUT

LIN

S-OUT

L-OUT

DATA

CLK

69 71

28 29 30

MASTER CONTROL

IC701

REAR 35 37

FRONT

MICON

INTERFACE

32 33

LATCH

427 LAT SW F CON

CENTER

65 64

3 4

S-IN

L-IN

DATA

CLK

DBFB H/L TA MUTE R RELAY

IIC DATA

CD POWER

STK MUTE

DELAY IC602

POWER

IIC CLK

RESET

AC CUT

XT1

XT2

S-OUT

FRONT

L-MIX

OUT

XTAL

REC 2A

2 1 7

55 56

100

D951

5MHz

FRONT

X601 8MHz

RESET

SWITCH

Q951

RESET

IC951

+5V

X701

X702

32.768KHz

MUTE

SWITCH

Q912

X601

8MHz

45 44 43 42

EQUALIZER / VOLUME

IC201

DATA

CLOCK

RESET

XOUT

XIN

SEG1-35 67 - 100 • 1

FLUORESCENT INDICATOR TUBE

J101

VIDEO/MD

(AUDIO)

OUT

+ +

S.WOOFER

MODE

SWITCH

Q206

DISPLAY CONTROL

IC601

GR1-16

51 - 66

FL601

REAR

CENTER

6 5

LED18

LED SELECT

SIRCS SPEANA 1 SPEANA 2 SPEANA 3 SPEANA 4

DOOR SW

AMP

IC861

BB22

DBFB

SWITCH

Q201

LED1

L+R JOG A JOG B

KEY 5

KEY 1

VOL A VOL B

IC603

3 5

BB12

AMP

FRONT

DBFB

SWITCH

Q202

•

LED

• SWITCH

18 23

•

39 42 43 44 45 46 26 41

24 40

D/A

S701

VOLUME

ROTARY

ENCODER

4 3 1

VOLUME

CLK

DATA

PANEL LED

LED

CONTROL

Q601

REMOTE

CONTROL

RECEIVER

IC602

S711

= AMS +

ROTARY

ENCODER

KEY

MATRIX

S681

OPEN

IC604

MUTE

Q254

MUTE

SWITCH

Q120

OUT

OUTLATCH

Q602

MUTE

Q601

Q602,603

MUTE

• R CH: Same as L ch

• SIGNAL PATH : FM : CD : PB : REC : VIDEO

REAR

CENTER

FRONT

DBFB

POWER ON/OFF

R RELAY

D+5V

CD POWER

STK MUTE

REAR

CENTER

POWER

SECTION

(Page 23)

– 21 – – 22 –

HCD-XB88AVK/XB88K

– POWER SECTION –

REAR

POWER AMP IC601

RY401

TM402

SURROUND

–1

REAR

SPEAKER

REAR

MAIN

SECTION

(Page 22)

CENTER

FRONT

DBFB

STK MUTE

R RELAY

CD POWER

POWER ON/OFF

FRONT

POWER AMP

IC201

1 10

AU/D5V SW

CENTER

FAN MOTOR

DRIVER

Q961, 962

RECT

D104,105

FRONT

Rch

UNREG –12V

SPEAKER

XB88K

T501

POWER

TRANSFORMER

TM401 FRONT

J760

PHONES

TRANSFORMER

CENTER

M901

FAN

MOTOR

XB88AVK

T901

POWER

XB88AVK

VOLTAGE

SELECTOR

S901

AC IN

D5V

CENTER

Rch

CD REG

+5V REG

THERMAL

DET

Q670,671

THP670

OVER LOAD

DET

Q201

D5V

SWITCHED

Q904

Q905

Q906

Q907

OVER LOAD

MUTE

SWITCH

Q331

DET

Q601,651

1318

Rch

+5V

D905

D7V

A+7.5V

A–7.5V

+12V

ST10V

PRO-LOG 10V

Q323

Rch

+7.5

–7.5 EN

+5V REG

IC902

3 1

+7V REG

IC903

3 1

+7V, –7V REG

IC901

+12V REG

IC904

3 1

+10V REG

IC905

–2

RELAY

DRIVE Q404

Rch

RY402

–1

RELAY

DRIVE Q403

RELAY

RECT D901

RECT D101

RECT D102

CONTROL

Q402

RECT

D110,111

VFDP

HP / SP

SWITCHING

Q401,405

RECT

D302,303

VF REG

Q941

PROTECTOR

Q901

VCC

VEE

IC301

PROTECT

SWITCH

Q301

UNREG

–12V

POWER B+ POWER B–

SURR B+

SURR B–

– 23 – – 24 –

• R CH : Same as L ch

• SIGNAL PATH : FM

– KEY CON SECTION –

HCD-XB88AVK/XB88K

J761

MIC 1

J762

MIC 2

MIC AMP

IC760 (1/2)

RV760

MIC LEVEL

LPF1

ECHO AMP IC760 (2/2)

ECHO IC761

SWITCH

IC1403

5 3

LPF2

RV761

ECHO LEVEL

L IN

Q1401

91011

K CON

KEY CONTROL

IC1401

LPF1

MIX OUT

Rch

DATA

CLOCK

STORBE

LATCH

CLK

DATA

L OUT

• R CH : Same as Lch

• Signal path : FM : MIC

MAIN

SECTION

(Page 21)

– 25 –

THIS NOTE IS COMMON FOR PRINTED WIRING

BOARDS AND SCHEMATIC DIAGRAMS. (In addition to this, the necessary note is printed in each block.)

For schematic diagrams.

Note:

• All capacitors are in µF unless otherwise noted. pF: µµF 50 WV or less are not indicated except for electrolytics and tantalums.

• All resistors are in Ω and

/4 W or less unless otherwise

specified.

•

: internal component.

• 2 : nonflammable resistor.

• 5 : fusible resistor.

• C : panel designation.

Note: The components identified by mark ! or dotted

line with mark ! are critical for safety. Replace only with part number specified.

• U : B+ Line.

• V : B– Line.

• H : adjustment for repair.

• Voltages and waveforms are dc with respect to ground under no-signal (detuned) conditions.

• Voltages are taken with a V OM (Input impedance 10 MΩ). Voltage variations may be noted due to normal production tolerances.

• Waveforms are taken with a oscilloscope. Voltage variations may be noted due to normal production tolerances.

• Circled numbers refer to waveforms.

• Signal path.

F : FM f : AM E : PB (DECK A) d : PB (DECK B) G : REC (DECK B) J : CD c : digital out I : PHONO

For printed wiring boards.

Note:

• X : parts extracted from the component side.

•

p : parts mounted on the conductor side.

•

• b : Pattern from the side which enables seeing.

(The other layers' patterns are not indicated.)

: Through hole.

: internal component.

WAVEFORMS – CD SECTION –

500mV/DIV, 500nsec/DIV

IC101 #£ RFO

200mV/DIV, 1µsec/DIV

IC101 2 FEI

50mV/DIV, 1msec/DIV

IC101 $¶ TEI

7.8µsec

IC103 @¶ MDP

230µsec

IC103 ^º XPCK

IC103 ^™ RFCK

135µsec

1.3Vp-p

0.5Vp-p

0.2Vp-p

5Vp-p

2.5Vp-p

5Vp-p

– MAIN SECTION (1/5) –

4.8Vp-p

8MHz

IC602 @¢ XTAL

– MAIN SECTION (2/5) –

5.5Vp-p

8MHz

IC701 0 X2

5.2Vp-p

32.768kHz

IC701 !£ XT2

– DISPLAY SECTION –

4Vp-p

8MHz

IC601 !™ X-OUT

• Indication of transistor

These are omitted

These are omitte

– 27 –

IC103 &¢ WFCK

2.6Vp-p

16.9344MHz

IC103 *ª XTAI

– 28 –

HCD-XB88AVK/XB88K

• Semiconductor Location

Ref. No. Location IC101 C-5

IC102 B-5 IC103 C-6

Q101 C-3

6-5. PRINTED WIRING BOARD – CD SECTION –

• See page 16 for Circuit Boards Location.

(Page 36)

–

29 –

–

30 –

6-6. SCHEMATIC DIAGRAM – CD SECTION –

• See page 28 for Waveforms.

• See page 77 for IC Block Diagrams.

• See page 82 for IC Pin Functions.

HCD-XB88AVK/XB88K

(Page 40)

–

31 –

–

32 –

HCD-XB88AVK/XB88K

6-23. PRINTED WIRING BOARD – CD MOTOR SECTION –

• See page 16 for Circuit Boards Location.

–

33 –

(Page 35)

–

34 –

6-24. SCHEMATIC DIAGRAM – CD MOTOR SECTION –

• See page 81 for IC Block Diagrams.

HCD-XB88AVK/XB88K

(Page 40)

–

35 –

–

36 –

+ 60 hidden pages