Sony HCD-XG55 Service Manual

HCD-XG55

SERVICE MANUAL

Ver 1.0 2002. 08

HCD-XG55 is the amplifier, CD player,
tape deck and tuner section in LBT-XG55.

Dolby noise reduction manufactured under license
from Dolby Laboratories Licensing Corporation.
“DOLBY” and the double-D symbol ; are trade­marks of Dolby Laboratories Licensing Corporation.

CD
Section

Tape
Section

Mexican Model

Model Name Using Similar Mechanism HCD-XG60/XG500
CD Mechanism Type CDM37M-5BD32L
Base Unit Name BU-5BD32L
Optical Pick-up Name KSS-213DH
Model Name Using Similar Mechanism HCD-XG60/XG500
Tape T ransport Mechanism Type TCM-230PWR42

Amplifier section

Continuous RMS power output (reference)

Total harmonic distortion less than 0.07%
Inputs

PHONO IN:
(phono jacks) sensitivity 3 mV,

MIX MIC:
(phone jack) sensitivity 1 mV,

VIDEO IN:
(phono jacks) sensitivity 250 mV,

GAME IN:
(phono jacks) sensitivity 250 mV,

MD IN:
(phono jack) sensitivity 450 mV,

Outputs
PHONES:
(stereo phone jack) accepts headphones of 8

VIDEO OUT:
(phono jack) voltage 250 mV

MD OUT:
(phono jacks) voltage 250 mV

FRONT SPEAKER:

160 + 160 watts (6 ohms at
1 kHz, 10% THD)

(6 ohms at 1 kHz, 70 W)

impedance 47 kilohms

impedance 10 kilohms

impedance 47 kilohms

impedance 47 kilohms

impedance 47 kilohms

ohms or more

impedance 1 kilohm

impedance 1 kilohm
accepts impedance of 6 to
16 ohms

SPECIFICATIONS

CD player section

System Compact disc and digital
Laser Semiconductor laser

Wavelength 780 – 790 nm
Frequency response 2 Hz – 20 kHz (±0.5 dB)
Signal-to-noise ratio More than 90 dB
Dynamic range More than 90 dB

Tape player section

Recording system 4-track 2-channel stereo
Frequency response 40 – 13,000 Hz (±3 dB),
(DOLBY NR OFF)

Tuner section

FM stereo, FM/AM superheterodyne tuner

FM tuner section

Tuning range 87.5 – 108.0 MHz
Antenna FM lead antenna

Antenna terminals 75 ohm unbalanced
Intermediate frequency 10.7 MHz

audio system
(λ=780nm), Emission

duration: continuous

using Sony TYPE I cassette
40 – 14,000 Hz (±3 dB),
using Sony TYPE II cassette

(50 kHz step)

COMPACT DISC DECK RECEIVER

AM tuner section

Tuning range

Antenna AM loop antenna
Antenna terminals External antenna terminal
Intermediate frequency 450 kHz

General

Power requirements 120 V AC, 50/60 Hz
Power consumption 240 watts
Dimensions (w/h/d) Approx. 355 x 425 x 450

Mass : Approx. 13.5 kg
Supplied accessories: AM loop antenna (1)

Design and specifications are subject to change
without notice.

530 – 1,710 kHz
(with the interval set at 10
kHz)
531 – 1,710 kHz
(with the interval set at 9
kHz)

mm

FM lead antenna (1)
Speaker cords (2)
Speaker pads (8)
Remote commander (1)
Batteries (2)

9-874-114-01

2002H1600-1
© 2002.08

Sony Corporation

Home Audio Company
Published by Sony Engineering Corporation

HCD-XG55

TABLE OF CONTENTS

1. SERVICING NOTES······················································· 3

2. GENERAL

Location of Controls ······························································ 4
Setting the Time ····································································· 5

3. DISASSEMBLY

3-1. Case·················································································7
3-2. Front Panel Section ························································· 7
3-3. Tape Mechanism Deck (TCM-230PWR42),
Cover (TC) ······································································8
3-4. Holder Deck B Assy, Holder Deck A Assy,
Lid (TC) Assy·································································· 8
3-5. LEAF SW Board, AUDIO Board ··································· 9
3-6. TC (B) Board, TC (A) Board, PANEL FL Board ········· 10
3-7. PANEL VR Board·························································10
3-8. HEADPHONE Board, FRONT INPUT Board············· 11
3-9. CD-L Board, CD-R (1) Board, CD-R (2) Board ·········· 11
3-10. DC Fan (M901), MAIN Board, Tuner (FM/AM) ······· 12
3-11. PA Board ····································································· 12
3-12. SUB TRANS Board, TRANS Board ·························· 13
3-13. CD Mechanism Deck (CDM37M-5BD32L) ·············· 14
3-14. Base Unit (BU-5BD32L) ············································ 15
3-15. BD Board ···································································· 15
3-16. Optical Pick-up (KSS-213DH) ··································· 16
3-17. Disc Table ··································································· 16
3-18. LED Board, CD MOTOR Board,
TABLE SENSOR Board ·············································17

4. TEST MODE···································································· 18

5. MECHANICAL ADJUSTMENTS ····························· 20

6. ELECTRICAL ADJUSTMENTS

Deck section ········································································· 20
CD Section ···········································································23

7. DIAGRAMS······································································ 24

7-1. Block Diagram
– CD SERVO Section –················································· 26
– TUNER/TAPE DECK Section – ································ 27
– MAIN Section – ························································· 28
–

DISPLAY/KEY CONTROL/POWER SUPPLY Section

– ····· 29

7-2. Printed Wiring Board – BD Board – ····························· 30
7-3. Schematic Diagram – BD Board – ······························· 31
7-4. Printed Wiring Boards – CD MOTOR Section –·········· 32
7-5. Schematic Diagram – CD MOTOR Section –··············33
7-6. Printed Wiring Board – AUDIO Board –······················ 34
7-7. Schematic Diagram – AUDIO Board –························· 35
7-8. Printed Wiring Board – LEAF SW Board – ················· 36
7-9. Schematic Diagram – LEAF SW Board – ···················· 36
7-10. Schematic Diagram – MAIN Board (1/3) –················ 37
7-11. Schematic Diagram – MAIN Board (2/3) –················ 38
7-12. Schematic Diagram – MAIN Board (3/3) –················ 39
7-13. Printed Wiring Board – MAIN Board – ······················ 40
7-14. Printed Wiring Board – PA Board –····························41
7-15. Schematic Diagram – PA Board – ······························42
7-16. Printed Wiring Boards
– FRONT INPUT/HEADPHONES Boards –·············43
7-17. Schematic Diagram
– FRONT INPUT/HEADPHONES Boards –·············44
7-18. Printed Wiring Board – PANEL FL Board – ·············· 45
7-19. Schematic Diagram – PANEL FL Board – ················· 46
7-20. Printed Wiring Board – PANEL VR Board – ············· 47
7-21. Schematic Diagram – PANEL VR Board – ················ 48
7-22. Printed Wiring Boards
– TC (A)/TC (B)/CD-L/CD-R (1)/CD-R (2) Boards – 49
7-23. Schematic Diagram
– TC (A)/TC (B)/CD-L/CD-R (1)/CD-R (2) Boards – 50
7-24. Printed Wiring Board
– TRANSFORMER Section– ·····································51
7-25. Schematic Diagram
– TRANSFORMER Section– ·····································51
7-26. IC Block Diagrams ·····················································52
7-27. IC Pin Function Description ······································· 54

8. EXPLODED VIEWS

8-1. Case, Back Panel Section·············································· 59
8-2. Front Panel Section-1···················································· 60
8-3. Front Panel Section-2···················································· 61
8-4. Chassis Section ·····························································62
8-5. Tape Mechanism Deck Section-1 (TCM-230PWR42) · 63
8-6. Tape Mechanism Deck Section-2 (TCM-230PWR42) · 64
8-7. CD Mechanism Deck Section (CDM37M-5BD32L) ··· 65
8-8. Base Unit Section (BU-5BD32L) ································· 66

9. ELECTRICAL PARTS LIST ······································· 67

2

SECTION 1

SERVICING NOTES

HCD-XG55

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 the 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.

CAUTION

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

This appliance is classified as
a CLASS 1 LASER product.
The CLASS 1 LASER
PRODUCT MARKING is
located on the rear exterior.

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, observe 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 waveforms is output three times.

The following caution label is located inside the unit.

SAFETY-RELATED COMPONENT WARNING!!

COMPONENTS IDENTIFIED BY MARK 0 OR DO TTED 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.

3

HCD-XG55

LOCATION OF CONTROLS
– Front Panel –

SECTION 2

GENERAL

234 5 6 789

1

This section is extracted from
instruction manual.

eh
eg
ef

ed

es

ea
e;

wh w;ql

wawswdwfwgwjwkwl

q;
qa

qs
qd

qf
qg
qh

qj
qk

A EJECT Z/Z B EJECT wg (15)
AUDIO L w; (22)
AUDIO R ql (22)
CD SYNC qg (16,17)
Control VOLUME qs (9,13,24)
Jog dial (AMS./>)

qj (9,15)

DIRECT EQUALIZER 5 (18)

SALSA
REGGAE
SAMBA
TANGO
MOVIE
GUITAR
ROCK
JAZZ
DANCE

GAME
DIRECTION es (15,16,17)
DISC SKIP qk (9,10,17)
DISC 1~5 wj (9)
DISPLAY 3 (8,11,13)
DOLBY NR es (15,16,26)
EDIT wl (17)

ENTER wh (12,14)
ENTER/NEXT qd (8,17,19,21,25)
FLASH e; (11)
FLAT qd (18)
FUNCTION q;
GAME qa (20,22)
GROOVE eg (18)
H SPEED DUB qg (16)
LOOP ea (7,11)
NON STOP wk (10)
P FILEqd (18,19)
PLAY MODE qk (9,10,17,25)
POWER SAVE/DEMO

(STANDBY) 2 (8)
PTY ws (14)
PUSH OPEN wf (9)
REPEAT qk (9)
SLEEP 7 (20)
SPECTRUM ANALYZER 4 (20)
STEREO/MONO ws (13,25)
SUPER WOOFER ef (18)
SUPER WOOFER MODE ed (18)
SURROUND eh (16,18)

(7,9,10,16,17,22)

TIMER SELECT 8 (17,21)
Toma PHONES qh
TUNER/BAND wd (12,13,16)
TUNER MEMORY wh (12)
TUNING MODE ws (12,13)
VIDEO wa (22)

BUTTON DESCRIPTION

@/1 1

c/CLOCK SET 6

v/V/b/B 9
z REC qf
X qf
m /M, AMS./> qfes
h,H qfes
x qfqkes
m /M qk
HX qk

+/– wd

4

Setting the time

1 Turn on the system.
2 Press c/CLOCK SET.

When you set the time for the first time,
skip to the step 5.

3 Press v/V repeatedly to select SET

CLOCK.

4 Press ENTER/NEXT.
5 Press v/V repeatedly to set the hour.
6 Press ENTER/NEXT.

The minute indication flashes.

7 Press v/V repeatedly to set the minute.
8 Press ENTER/NEXT.

The clock starts working.

Tip

If you’ve made a mistake or want to change the time,
start over from step 1.

Note

The clock settings are canceled when you disconnect
the power cord or if a power failure occurs.

Remote control

ws

HCD-XG55

123

wa

w;
ql
qk
qj
qh

qg
qf

AMS ./>, PRESET+/– 5

(9,13,15)
CD N wa (9)
CHECK 8 (10)
CLEAR 7 (10)
DECK A N ql
DECK B N qk
DISC SKIP 1 (9,10,17)
FILE SELECT ON/OFF qf (18)
FILE SELECT F/f qg (11)
FLASH qs (11)
FUNCTION qa
LOOP qh (7,11)
MD N qj
MD X 0
MD x 9
SLEEP 2 (20)
TUNER/BAND w; (12,13)
VOL +/– qd (9,13)

(7,9,10,16,17,22)

4
5
6

7
8

9
q;

qa

qs

qd

BUTTON DESCRIPTION

@/1 3
x 4
m/M 6
X ws

5

HCD-XG55

Note : Disassemble the unit in the order as shown below.

SET

CASE

SECTION 3

DISASSEMBLY

FRONT PANEL SECTION

TAPE MECHANISM DECK

(TCM-230PWR42), COVER (TC)

HOLDER DECK B ASSY,

HOLDER DECK A ASSY,

LID (TC) ASSY

CD MECHANISM DECK

(CDM37M-5BD32L)

DC FAN (M901),

MAIN BOARD, TUNER (FM/AM)

PA BOARD

LEAF SW BOARD,

AUDIO BOARD

SUB TRANS BOARD,

TRANS BOARD

TC (B) BOARD,

TC (A) BOARD,

PANEL FL BOARD

PANEL VR BOARD

HEADPHONE BOARD,

FRONT INPUT BOARD

CD-L BOARD,

CD-R (1) BOARD,

CD-R (2) BOARD

BASE UNIT

(BU-5BD32L)

BD BOARD

DISC TABLE

OPTICAL PICK-UP

(KSS-213DH)

LED BOARD,

CD MOTOR BOARD,

TABLE SENSOR BOARD

6

3-1. Case

)

)

1

three screws
(CASE 3 TP2)

5

6

case

4

2

five screws
(+BVTT 3

×

6)

3

two screws
(+BVTP 3

HCD-XG55

×

8

3-2. Front Panel Section

8

two screws
(+BVTP 3

×

8)

1

2

wire (flat type)
(17 core) (CN304)

3

wire (flat type)
(13 core) (CN431)

wire (flat type)
(15 core) (CN303)

5

4

1

three screws
(CASE 3 TP2)

4

connector
(CN702)

6

screw
(BVTP 3

7

two lugs

×

8

9

lug

qd

front panel section

qa

four screws
(+BVTP 3

5

connector

×

(CN806)

8)

q;

screw
(+BVTP 3

qs

claw

×

8)

7

HCD-XG55

3-3. Tape Mechanism Deck (TCM-230PWR42), Cover (TC)

7

cover (TC)

6

seven claws

4

wire (flat type) (17 core)
(CN1001)

1

two screws
(+BVTP 3 × 8)

5

tape mechanism deck
(TCM-230PWR42)

3-4. Holder Deck B Assy, Holder Deck A Assy, Lid (TC) Assy

9

lid (TC) assy

front panel assy

5

(deck-B) assy

2

spring

(TC-lid)

holder

2

two screws
(+BVTP 3 × 8)

7

(deck-A) assy

4

spring

(TC-B)

3

wire (flat type) (15 core)
(CN601)

holder

6

spring

(TC-A)

1

spring (TC-lid)

3

four screws

8

bracket (TC)

(+BVTP 2.6

×

8)

8

3-5. LEAF SW Board, AUDIO Board

d

5

five claws

4

Remove the

two solderings.

1

screw (+PTT 2

×

4)

3

Remove the

two solderings.

6

LEAF

HCD-XG55

SW boar

7

Remove the

four solderings.

9

two push rivet

8

Remove the

eight solderings.

q;

two

screws (+PTT 2

2

Remove the

four solderings.

qa

AUDIO board

×

6)

9

HCD-XG55

)

)

)

3-6. TC (B) Board, TC (A) Board, PANEL FL Board

9

two claws

8

three claws

qa

PANEL FL board

7

six screws
(+BVTP 2.6 × 8

6

TC (A) board

5

five screws
(+BVTP 2.6 × 8

3-7. P ANEL VR Board

1

knob (vol)

6

claw

1

connector
(CN703)

q;

wire (flat type)
(13 core) (CN601)

3

TC (B) board

2

four screws
(+BVTP 2.6 × 8)

7

wire (flat type) (21 core)
(CN701)

4

connector
(CN704)

8

PANEL VR board

10

3

eject lever assy

2

two screws
(+BVTP 2.6 × 8)

4

eleven screws
(+BVTP 2.6 × 8)

5

seven screws
(+BVTP 2.6 × 8

3-8. HEADPHONE Board, FRONT INPUT Board

qa

CD-L board

(

*

1) CD-L board, CD-R (1) and CD-R (2) board are connected to panel (cd) assy
by means of hot-melting the plastics.
For service must use screws to replace hot-melted pins.

(

*

1)

(

*

1)

qd

CD-R (1) board

qf

CD-R (2) board

3

five screws
(+BVTP 2.6

×

10)

5

lid (cd) assy

8

panel (cd) assy

9

knob (cd)

7

spring (cd)

6

2

reinforcement (1)

4

four screws
(+BVTP 2.6

×

10)

q;

five screws
(+BVTP 2.6

×

8)

qs

six screws
(+BVTP 2.6

×

8)

1

two screws
(+BVTP 2.6

×

8)

3

HEADPHONE board

2

BRACKET (PHONES) board

HCD-XG55

6

FRONT INPUT board

3-9. CD-L Board, CD-R (1) Board, CD-R (2) Board

5

bracket (input)

1

two screws
(+BVTP 2.6

4

two screws
(+BVTP 2.6

×

8)

×

8)

11

HCD-XG55

)

3-10. DC Fan (M901), MAIN Board, Tuner (FM/AM)

qj

wire (flat type)
(13 core) (CN1)

q;

back panel

9

qa

wire (flat type) (19 core)
(CN411)

DC fan
(M901)

6

qk

tuner (FM/AM)

qh

two screws
(+BVTP 3

×

8)

2

six screws
(+BVTP 3

1

wire (flat type)
(13 core) (CN441)

3

three screws
(+BVTP 3

8

two screws
(+BVTP 3

4

screw
(+BVTP 3

5

three screws
(+BVTP 3

connector (CN903

7

qg

MAIN board

×

8)

×

8)

×

8)

×

8)

×

8)

3-11. PA Board

6

1

screw
(+BVTP 3

7

PA board

two screws
(+BVTP 3

×

×

8)

16)

4

connector
(CN904)

qs

connector

(CN412)

2

two screws
(+BVTP 3

3

qf

×

8)

heat sink

qd

two screws
(+BVTP 3

two connectors
(CN803, 804)

×

8)

12

8

dust cover

5

connector
(CN952)

3-12. SUB TRANS Board, TRANS Board

r

7

four screws

8

TRANS board

6

connector
(CN952)

(+BVTT 4

×

8)

T951

4

two screws
(+BVTT 3

HCD-XG55

5

×

8)

SUB TRANS board

3

2

connector
(CN901)

1

connector
(CN904)

connecto
(CN902)

13

HCD-XG55

3-13. CD Mechanism Deck (CDM37M-5BD32L)

wire (flat type)

1

(19 core) (CN411)

4

three screws
(+BVTP 3

×

8)

6

7

3

three screws
(+BVTP 3

8

×

Open the cable clamp.

8)

2

q;

CD mechanism deck

(CDM37M-5BD32L)

connector
(CN412)

9

five screws
(+BVTP3

6

5

two screws
(+BVTP 3

×

8)

×

8)

14

3-14. Base Unit (BU-5BD32L)

w

)

3

base unit
(BU-5BD32L)

HCD-XG55

3-15. BD Board

1

four screws
(+PTPWHM 2.6)

4

Remove solders.

(two places)

2

boss

1

BU fitting scre

5

Remove solders.

(two places)

7

BD board

3

2

holder (BU-5)

screw
(BVTP 2.6

×

8)

6

wire (flat type)
(19 core) (CN101

15

HCD-XG55

e

3-16. Optical Pick-up (KSS-213DH)

two screws

1

(slider),step

2

slider (37)

6

spring tension

5

sled shaft

7

lens cover

9

optical pick-up

(KSS-213DH)

8

wire (flat type)
(16 core)

4

3

3-17. Disc T able

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.

A

1

screw
(+BVTP 3

3

step screw

×

8)

2

bracket (BU)

4

disc tabl

16

A

3-18. LED Board, CD MOTOR Board, TABLE SENSOR Board

d

5

three screws
(+BVTP3

1

screw
(+BVTP3

3

LED board

4

7

connector

×

8)

(CN201)

Remove the

two solderings.

HCD-XG55

×

8)

9

screw
(+BVTP3

q;

×

8)

TABLE SENSOR boar

8

CD MOTOR board

2

two claws

6

three claws

17

HCD-XG55

SECTION 4

TEST 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. Turn the power ON or set to the DEMO mode.

2. Press three buttons of [ /CLOCK SET], [ENTER/NEXT], and

?/1 simultaneously.

3. The set is reset, and displays “COLD RESET”, then becomes

DEMO mode.

[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. Turn the power ON or set to the DEMO mode.

2. Press three buttons of [ /CLOCK SET], [ENTER/NEXT],

and [DISC 1] simultaneously.

3. The set is reset, and becomes standby state.

[Change-over the AM Tuning Interval]

•The AM tuning interval can be changed over 9 kHz or 10 kHz.

Procedure:

1. Press the ?/1 button to turn the power ON.

2. Select the function “TUNER”, and press the [TUNER/BAND]

button to select the BAND “AM”.

3. Press the ?/1 button to turn the power OFF.

4. Press the [ENTER/NEXT] and ?/1 buttons simultaneously,

and the display on the fluorescent indicator tube changes to
“AM 9 K STEP” or “AM 10 K STEP”, and thus the tuning
interval is changed over.

c

c

[CD Delivery Mode]

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

Procedure:

1. Press the ?/1 button to turn the power ON.

2. Press the [LOOP] and ?/1 buttons simultaneously.

3. A message “LOCK” is displayed on the fluorescent indicator

tube, and the CD delivery mode is set.

[LED and Fluorescent Indicator Tube All Lit, Key Check
Mode]

Procedure:

1. Press three buttons of [ /CLOCK SET], [ENTER/NEXT],

and [DISC 2] simultaneously.

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

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

3. In the key check mode, the fluorescent indicator tube displays

“K 0 J0 V0”. Each time a button is pressed, “K” value in­creases. However , once a button is pressed, it is no longer tak en
into account.
“J” value increases like 1, 2, 3 ... if turn the JOG dial clock­wise, or it decreases like 0, 9, 8 ... if turn the JOG dial counter­clockwise.
“V” value increases like 1, 2, 3 ... if turn the [VOLUME] dial
clockwise, or it decreases like 0, 9, 8 ... if turn the JOG dial
counterclockwise.

4. To release from this mode, press three buttons in the same

manner as step 1, or disconnect the power cord.

c

18

HCD-XG55

[Aging Mode]

This mode can be used for operation check of tape deck section.
Tape deck section work in parallel.

• If an error occurred:
The aging operation stops and display then status.

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

Procedure:

1. Load the tapes into the decks A and B respectively.

2. Press the [FUNCTION] button to select the function “CD”.

3. Press the [PLAY MODE] button to set the “ALL DISCS” mode,

and press the [REPEAT] button to “REPEAT” off.

4. Press three buttons of [ /CLOCK SET], [ENTER/NEXT],

c

and [DISC 4] simultaneously.

5. The aging mode is activated, if the indicator of disc tray num-

ber on the fluorescent indicator tube is blinking.

6. To release from the aging mode, press the ?/1 button to turn

the power OFF and operate the cold reset. (Refer to the “MC
Cold Reset”)

1. Display at the Aging Mode

• Display operating state of tape deck section alternately.

• If an error occurred, stop display.

2. Tape Deck Section

•The sequence during the aging mode is following as below.

• If an error occurred, stop display that step.

Aging mode sequence (Tape deck section) :

Rewind the tape A and B

“TAPE A AG-1”

Shut off

FWD play the tape A

“TAPE A AG-2”

2 minutes

Fast forward the tape A

“TAPE A AG-3”

Shut off or 20 seconds

REV play the tape A

“TAPE A AG-4”

2 minutes

Rewind the tape A

“TAPE A AG-5”

Shut off

FWD play the tape B

“TAPE B AG-2”

2 minutes

Fast forward the tape B

“TAPE B AG-3”

Shut off or 20 seconds

REV play the tape B

“TAPE B AG-4”

2 minutes

Rewind the tape B

“TAPE B AG-5”

Shut off

Note: “TAPE * AG-*” is display of each step.

19

HCD-XG55

SECTION 5

MECHANICAL ADJUSTMENTS

SECTION 6

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 Torque Meter Meter Reading

FWD CQ-102C (31 to 71 g•cm)

FWD
back tension

REV CQ-102RC (31 to 71 g•cm)

REV
back tension

FF/REW CQ-201B (71 to 143 g•cm)

FWD tension CQ-403A (100 g or more)

REV tension CQ-403A (100 g or more)

CQ-102C (2 to 6 g•cm)

CQ-102RC (2 to 6 g•cm)

3.1~6.96 mN•m

(0.43 – 0.98 oz•inch)

0.20~0.58 mN•m

(0.03 – 0.08 oz•inch)

3.1~6.96 mN•m

(0.43 – 0.98 oz • inch)

0.20~0.58 mN•m

(0.03 – 0.08 oz • inch)

6.97~14.02 mN•m

(0.99 – 1.99 oz • inch)

9.80 mN•m

(3.53 oz or more)

9.80 mN•m

(3.53 oz or more)

DECK SECTION

0 dB = 0.775 V

Precaution

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

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

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

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 R­CH.

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

8. Set to the DOLBY NR OFF.

9. Set to the test mode.
(1) Press the ?/1 button to turn the power ON.
(2) Select the function “TAPE A or B”.
(3) Press the button of [ /CLOCK SET], [ENTER/NEXT],

c

and [DISC 3] simultaneously , to set the tape deck test mode
and displays “TEST MODE” on the fluorescent indicator
tube.

(4) To release from the test mode, press the ?/1 button.

•Test Tape

Tape Signal Used for

P-4-A100 10 kHz, – 10 dB Azimuth Adjustment

WS-48B 3 kHz, 0 dB Tape Speed Adjustment

P-4-L300 315 Hz, 0 dB Playback Level Adjustment

20

HCD-XG55

e

r

r

Record/Playback Head Azimuth Adjustment

DECK A DECK B

Note: Perform this adjustments for both decks

Procedure:

1. Mode: Playback (FWD)

test tape
P-4-A100
(10 kHz, – 10 dB)

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
so that outputs match within 1dB of peak.

L-CH
peak

Output
level

R-CH

Screw
position

peak

3. Mode: Playback

test tape
P-4-A100
(10 kHz, – 10 dB)

L-CH

set

R-CH

waveform of oscilloscope

in phase 45° 90° 135° 180°

MAIN board
MD OUT jack (J701)
L-CH, R-CH

set

within
1dB

L-CH
peak

MAIN board
MD OUT jack (J701)
L-CH

R-CH

good

R-CH
peak

level mete

oscilloscop

V

wrong

+
–

within
1dB

H

Screw
position

Adjustment Location:Playback Head (Deck A).

Record/Playback/Erase Head (Deck B).

forward

reverse

Tape Speed Adjustment DECK B

Mode: Playback

test tape
WS-48B
(3 kHz, 0 dB)

set

MAIN board
MD OUT jack (J701)
L-CH, R-CH

frequency counter

+
–

1. Insert the WS-48B into the deck B.

2. Press the H button on the deck B.

3. Press the [H SPEED DUB] button in playback mode.
Then at HIGH speed mode.

4. Adjust RV1001 on the LEAF SW board do that frequency
counter reads 6,000 ± 180 Hz.

5. Press the [H SPEED DUB] button.
Then back to NORMAL speed mode.

6. Adjust RV1002 on the LEAF SW board so that frequency
counter reads 3,000 ± 90 Hz.

Adjustment Location: LEAF SW board
Sample value of Wow and Flutter: 0.3% or less W.RMS (JIS)

(WS-48B)

Playback Level Adjustment DECK A DECK B

Procedure:

Mode: Playback

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

level mete

4. Repeat step 1 to 3 in playback (REV) mode.

5. After the adjustments, apply suitable locking compound to the
pats adjusted.

set

MAIN board
MD OUT jack (J701)
L-CH

+
–

Deck A is RV311 (L-CH), Deck B is RV301 (L-CH) so that ad­justment within specification values as follows.

Specification Values:

J101 PB level: 301.5 to 338.3 mV (– 8.2 to – 7.2 dB) level
difference between the channels: within ± 0.5 dB

Adjustment Location: AUDIO board

21

HCD-XG55

e

r

r

REC Bias Adjustment DECK B

Procedure:

1. Mode: Record
FUNCTION: VIDEO

MAIN board
VIDEO AUDIO IN jack (J701)
L-CH, R-CH



50 mV (– 23.8 dB)




600 Ω

set

blank tap
CN-123

AF OSC

1) 315 Hz

2) 10 kHz

attenuator

2. Mode: Playback

recorded
portion

set

MAIN board
MD OUT jack (J701)
L-CH, R-CH

level mete

+
–

3. Confirm playback the signal recorded in step 1 become speci­fication values as follows.
If these values are out of specification v alues, adjust the R V341
(L-CH) and RV441 (R-CH) on the AUDIO board to repeat
steps 1and 2.

Specification values: Playback output of 315 Hz to playback

output of 10 kHz: ± 0.5 dB

Adjustment Location: AUDIO board

Specification values:

J101 PB level: 47.2 to 53.0 mV (– 24.3 to – 23.3 dB)

Adjustment Location: MAIN board

– MAIN BOARD (Conductor Side) –

VIDEO

AUDIO IN

L/R

J701

REC LEVEL



IC301

RV351

R-CH

MD OUT

RV301

L-CH

L/R











– AUDIO BOARD (Component Side) –

RV441

RV301

PB LEVEL
(L)

– DECK B –

IC602

RV341

RL



REC BIAS

CN601

RV311

PB LEVEL (L)

– DECK A –

REC Level Adjustment DECK B

Procedure:

1. Mode: Record
FUNCTION: VIDEO

MAIN board
VIDEO AUDIO IN jack (J701)
L-CH, R-CH

AF OSC

315 Hz, 50 mV (– 23.8 dB)

600 Ω

attenuator

blank tape
CS-123

set

2. Mode: Playback

recorded
portion

set

MAIN board
MD OUT jack (J701)
L-CH, R-CH

level mete

+
–

3. Confirm playback the signal recorded in step 1 become speci­fication values as follows.
If these values are out of specification v alues, adjust the R V301
(L-CH) and R V351 (R-CH) on the MAIN board to repeat steps
1 and 2.

– LEAF SW BOARD (Component Side) –

TAPE SPEED



(NORMAL) (HIGH)

RV1002



RV1001

CN1001

22

HCD-XG55

e

p

e

+
–

BD board

TP (TE)
TP (VC)

oscilloscope

(DC range)

)

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 10 MΩ 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

oscilloscop

BD board

TP (FE)
TP (VC)

Procedure:

1. Connect oscilloscope to TP (FE) and TP (VC).

2. Connect between TP (FE1) and TP (VC) by lead wire.

3. Connect between TP (AGCCON) and TP (GND) by lead wire.

4. Turn the power ON.

5. Load a disc (YEDS-18) and actuate the focus search. (In con-

sequence of open and close the disc tray, actuate the focus
search)

6. Cofirm that the oscilloscope waveform (S-curv e) is symmetri-

cal between A and B. And confirm peak to peak level within
4 ± 1 Vp-p.

S-curve wavefor m

+
–

symmetry

E-F Balance (1 Track Jump) Check

Procedure :

1. Connect oscilloscpe to TP (TE) and TP (VC).

2. Turn the power ON.

3. Load a disc (YEDS-18) and playback the number five track.

4. Press the H X button. (Becomes the 1 track jump mode)

5. Confirm that the level B and A (DC voltage) on the oscillo­scope waveform.

1 track jump waveform

B

0V

level = 1.3 ± 0.6 Vp-p symmetry

Specified level: × 100 = less than ± 22%

A
B

center of
waveform

A (DC voltage

6. After check, remove the lead wire connected in step 1.

A

within 4 ± 1 Vp-

B

7. After check, remove the lead wire connected in step 2 and 3.

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

oscilloscop

(AC range)

BD board

TP (RF)
TP (VC)

+
–

Procedure:

1. Connect oscilloscope to TP (RF) and TP (VC).

2. Connect between TP (AGCCON) and TP (GND) by lead wire.

3. Turn the power ON.

4. Load a disc (YEDS-18) and press the H X button to play.

5. Confirm that the oscilloscope wav eform is clear and check RF
signal level is correct or not.

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

Note: Clear RF signal waveform means that the shape “ ” can be clearly

distinguished at the center of the waveform.

VOLT/DIV: 200 mV
TIME/DIV: 500 ns
(with the 10: 1 probe
in use)

level:

1.45 ± 0.3 Vp-p

Checking Location:

– BD BOARD (Side B) –

TP (VC)

IC102

TP (RF)

IC103

TP (TE)

TP (AGCCON)
TP (FE)

TP (FE1)

TP (GND)

23

HCD-XG55

SECTION 7

DIAGRAMS

NOTE FOR PRINTED WIRING BOARDS AND SCHEMATIC DIAGRAMS

Note on Printed Wiring Board:

• X : parts extracted from the component side.

• Y : parts extracted from the conductor side.

• : Pattern from the side which enables seeing.
(The other layers' patterns are not indicated.)

Caution:
Pattern face side: Parts on the pattern face side seen from
(Side B) the pattern face are indicated.
Parts face side: Parts on the parts face side seen from
(Side A) the parts face are indicated.

• Indication of transistor.

Q

B

CE

These are omitted.

Q

B

CE

These are omitted.

C
Q

B

E

These are omitted.

Note on Schematic Diagram:

• 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 1/
specified.

• 2 : nonflammable resistor.

• 5 : fusible resistor.

• C : panel designation.

f

•

Note: The components identified by mark 0 or dotted line

• A : B+ Line.

• B : B– Line.

• H : adjustment for repair.

•Voltages are taken with a V OM (Input impedance 10 MΩ).

•Waveforms are taken with a oscilloscope.

• Circled numbers refer to waveforms.

• Signal path.

: internal component.

with mark 0 are critical for safety.
Replace only with part number specified.

Voltage variations may be noted due to normal produc­tion tolerances.

Voltage variations may be noted due to normal produc­tion tolerances.

F : TUNER (FM/AM)
E : TAPE PLAY (DECK A)
d : TAPE PLAY (DECK B)
G : RECORD
J : CD PLAY (ANALOG OUT)
c : CD PLAY (DEGITAL OUT)
N : MIC INPUT

4

W or less unless otherwise

24

• Circuit Boards Location •Waveforms

d

TRANS board SUB TRANS board

HCD-XG55

PANEL VR board

TC (A) board

CD-L board

TC (B) board

PANEL FL board

CD-R (1) board

FRONT INPUT board

TUNER (FM/AM )

HEADPHONE board

CD-R (2) board

MAIN boar

PA board

– BD Board –

1

IC101 yj (XTAO)

59 ns

4

IC101 el (FE)

(CD Play Mode)

0.5 Vp-p

2

(CD Play Mode)

3.1 Vp-p

5

(CD Play Mode)

IC101 ta (RFAC)

IC101 wh (MDP)

7.8

µ

s

0.5 Vp-p0.5 Vp-p

1.2 Vp-p

2.5 Vp-p

3

IC101 ra (TE)

(CD Play Mode)

6

IC103 qh (RFO)

(CD Play Mode)

0.2 Vp-p

1.3 Vp-p

– MAIN Board – – PANEL FL Board –

1

IC501 q; (XC-IN)

µ

s

30.5

1.8 Vp-p

2

IC501 qg (X-IN)

62.5 ns

1.8 Vp-p

1

IC601 u; (XIN)

80 ns

3.7 Vp-p

TABLE SENSOR board

CD MOTOR board

LEAF SW board

BD board

AUDIO board

LED board

2525