Sony CSDXD-55 Service manual

CSD-XD55

SERVICE MANUAL

Ver. 1.4 2005.12

Section

Section

US Model

Canadian Model

AEP Model

UK Model

Model Name Using Similar Mechanisma CFD-S250

CD

CD Mechanism Type KSM-213RDP

Optical Pick-up Name KSS-213R

Model Name Using Similar Mechanism NEW

TC

Tape Transport Mechanism Type MF-XD55

E Model

AUDIO POWER SPECIFICATIONS

POWER OUTPUT AND TOTAL
HARMONIC DISTORTION
With 3.2-ohm loads, both channels driven
from 150 - 6,300 Hz; rated 3.0 W per
channel-minimum RMS power, with no
more than 10 % total harmonic distortion
in AC operation.

Other specifications
CD player section

System

Compact disc digital audio system

Laser diode properties

Material: GaAlAs
Wave length: 780 nm
Emission duration: Continuous
Laser output: Less than 44.6 µW
(This output is the value measured at a distance
of about 200 mm from the objective lens surface
on the optical pick-up block with 7 mm aperture.)

Spindle speed

200 r/min (rpm) to 500 r/min (rpm)
(CLV)

Number of channels

2

Frequency response

20 - 20 000 Hz +1/–2 dB

Wow and flutter

Below measurable limit

SPECIFICATIONS

Radio section

Frequency range

US, CND model

FM 87.5 - 108 MHz
AM 530 - 1 710 kHz

E, SP models

FM 87.5 - 108 MHz
AM 530 - 1 710 kHz (10 kHz step)

531 - 1 611 kHz (9 kHz step)

AEP, UK model

FM 87.5 - 108 MHz
MW 530 - 1611 kHz(9kHz step)

530 - 1610 kHz(10kHz step)

LW 153 - 279 kHz
Antennas

FM: Telescopic antenna
AM: Built-in ferrite bar antenna

Cassette recorder section

Recording system

4-track 2 channel stereo

Fast winding time

Approx. 120 s (sec.) with Sony cassette C-60

Frequency response

TYPE I (normal): 80 - 10 000 Hz

– Continued on next page –

CD STEREO RADIO CASSETTE RECORDER

9-877-717-05

2005L02-1
© 2005.12

Sony Corporation

Personal Audio Division
Published by Sony Engineering Corporation

CSD-XD55

Ver 1.1

Ver 1.1

General

Speaker

Full range: 10 cm dia., 3.2 ohms, cone type (4)
Tweeter: 2.0 cm (2)

Outputs

Headphones jack (stereo minijack)
For 16 - 68 ohms impedance headphones

Power output

4.5 W + 4.5 W (at 3.2 ohms, 10% harmonic
distortion (DC))

Power requirements

For CD stereo radio cassette recorder:
US, CND model

120V AC, 60 Hz
Central American model and South American
model:

110 - 127V, 220 - 240V AC selectable,

50/60 Hz
Other models:

230 V AC, 50 Hz
9 V DC, 6 size D (R20) batteries
For remote control
3 V DC, 2 size AA (R6) batteries

Power consumption

US model, Canadian model, Central American
model and Soy∫h American model :

AC 17 W
Other models:

AC 16 W

Battery life

For CD stereo radio cassette recorder:

FM recording

Sony R20P: approx. 12 h
Sony alkaline LR20: approx. 34 h

Tape playback

Sony R20P: approx. 5.5 Ah
Sony alkaline LR20: approx. 15.5 h

CD playback

Sony R20P: approx. 2.5 h
Sony alkaline LR20: approx. 12 h

Dimensions

Approx. 552 x 271 x 318 mm (w/h/d)

(21 3⁄4 x 10 5⁄8 x12 1⁄2 inches) (incl. projecting parts)

Mass

Approx. 5.4 kg (11 lb. 14 oz) (incl. batteries)

Supplied accessory

AC power cord (1)

Remote control (1)

Design and specifications are subject to changewithout notice.

• Abbreviation
CND : Canadian model
SP : Singapore model

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.

NOTES ON HANDLING THE OPTICAL PICK-UP BLOCK
OR BASE UNIT

The laser diode in the optical pick-up block may suffer electrostatic
breakdown because of the potential difference generated by the
charged electrostatic load, etc. on clothing and the human body.
During repair, pay attention to electrostatic breakdown 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 pick­up block. Therefore, when checking the laser diode emission,
observe from more than 30 cm away from the objective lens.

SAFETY CHECK-OUT

After correcting the original service problem, perform the following
safety checks before releasing the set to the customer:
Check the antenna terminals, metal trim, “metallized” knobs, screws,
and all other exposed metal parts for AC leakage. Check leakage as
described below.

LEAKAGE

The AC leakage from any exposed metal part to earth ground and
from all exposed metal parts to any exposed metal part having a
return to chassis, must not exceed 0.5 mA (500 microamperes).
Leakage current can be measured by any one of three methods.

1. A commercial leakage tester, such as the Simpson 229 or RCA
WT-540A. Follow the manufacturers’ instructions to use these
instruments.

2. A battery-operated AC milliammeter. The Data Precision 245
digital multimeter is suitable for this job.

3. Measuring the voltage drop across a resistor by means of a
VOM or battery-operated AC voltmeter. The “limit” indication
is 0.75 V, so analog meters must have an accurate low-voltage
scale. The Simpson 250 and Sanwa SH-63Trd are examples
of a passive VOM that is suitable. Nearly all battery operated
digital multimeters that have a 2V AC range are suitable. (See
Fig. A)

CAUTION

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

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.

2

To Exposed Metal

Par ts on Set

AC

0.15 µF

Fig. A. Using an AC voltmeter to check AC leakage.

1.5 kΩ

Earth Ground

Voltmeter
(0.75 V)

CSD-XD55

Ver 1.2

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.

ATTENTION AU COMPOSANT AYANT RAPPORT

À LA SÉCURITÉ!
LES COMPOSANTS IDENTIFÉS PAR UNE MARQUE 0 SUR LES
DIAGRAMMES SCHÉMATIQUES ET LA LISTE DES PIÈCES SONT
CRITIQUES POUR LA SÉCURITÉ DE FONCTIONNEMENT. NE
REMPLACER CES COMPOSANTS QUE PAR DES PIÈSES SONY
DONT LES NUMÉROS SONT DONNÉS DANS CE MANUEL OU
DANS LES SUPPÉMENTS PUBLIÉS PAR SONY.

• UNLEADED SOLDER

Boards requiring use of unleaded solder are printed with the lead­free mark (LF) indicating the solder contains no lead.
(Caution: Some printed circuit boards may not come printed with
the lead free mark due to their particular size.)

: LEAD FREE MARK

Unleaded solder has the following characteristics.

•Unleaded solder melts at a temperature about 40°C higher than

ordinary solder.
Ordinary soldering irons can be used but the iron tip has to be
applied to the solder joint for a slightly longer time.
Soldering irons using a temperature regulator should be set to
about 350°C.
Caution: The printed pattern (copper foil) may peel away if
the heated tip is applied for too long, so be careful!

• Strong viscosity
Unleaded solder is more viscous (sticky, less prone to flow)
than ordinary solder so use caution not to let solder bridges
occur such as on IC pins, etc.

• Usable with ordinary solder
It is best to use only unleaded solder but unleaded solder may
also be added to ordinary solder.

TABLE OF CONTENTS

1. SERVICING NOTES ................................................ 4

2. GENERAL ................................................................... 5

3. DISASSEMBLY

3-1. Disassembly Flow ............................................................ 6

3-2. Cabinet (Top) Assy........................................................... 6

3-3. Cabinet (Front Assy), Cabinet (Bottom) Assy ................. 7

3-4. Wires ................................................................................ 8

3-5. MD Block ......................................................................... 9

3-6. Cassette Holder ................................................................ 9

3-7. Main Board ...................................................................... 10

3-8. Tuner Board...................................................................... 10

3-9. Power Board ..................................................................... 11

3-10. CD Lid.............................................................................. 11

3-11. CD Block Assy ................................................................. 12

3-12. Optical Pick-up ................................................................ 12

3-13. R/P Head (HRP301), TC Board ....................................... 13

3-14. Main Belt, RF Belt, Motor Assy (M301) .........................13

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

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

6. DIAGRAMS

6-1. IC Pin Description ............................................................ 17

6-2. Circuit Boards Location ................................................... 17

6-3. Block Diagram – CD Section – ........................................ 18

6-4. Block Diagram – Main Section – ..................................... 19

6-5. Printed Wiring Board – CD Section –.............................. 20

6-6. Schematic Diagram – CD Section –................................. 21

6-7. Printed Wiring Board

– Tuner Section(US, CND, E, SP model) – ..................... 22

6-8. Printed Wiring Board

– Tuner Section (AEP, UK model)– ................................23

6-9. Schematic Diagram – Tuner Section –............................. 24

6-10. Printed Wiring Boards – Main Section – ......................... 25

6-11. Schematic Diagram – Main Section (1/2) – ..................... 26

6-12. Schematic Diagram – Main Section (2/2) – .....................27

6-13. Printed Wiring Board – TC Section – .............................. 28

6-14. Schematic Diagram – TC Section – ................................. 29

6-15. Printed Wiring Boards – Control Section –...................... 30

6-16. Schematic Diagram – Control Section – .......................... 31

6-17. Printed Wiring Boards – Power Supply Section – ........... 32

6-18. Schematic Diagram – Power Supply Section –................ 33

6-19. IC Block Diagrams ........................................................... 34

7. EXPLODED VIEWS

7-1. Cabinet Section ................................................................ 37

7-2. Cabinet (Front) Section-1................................................. 38

7-3. Cabinet (Front) Section-2................................................. 39

7-4. Cabinet (Top) Section ...................................................... 40

7-5. Cabinet (Bottom) Section................................................. 41

7-6. Tape Mechanism Section ................................................. 42

7-7. CD Mechanism Section-1 ................................................ 43

8. ELECTRICAL PARTS LIST ..................................44

3

CSD-XD55

SECTION 1

SERVICING NOTES

CHUCK PLATE JIG ON REPAIRING

On repairing CD section, playing a disc without the lid (CD), use
Chuck Plate Jig.

• Code number of Chuck Plate Jig: X-4918-255-1

LASER DIODE AND FOCUS SEARCH OPERATION
CHECK

1. Turn ON the[OPERATE]button and press[CD] button to CD
position.

2. Open the CD lid.

3. Turn on S801 with screwdriver , etc. as following figure.

4. Press the N X (CD) button.

5. Confirm the laser diode emission while observing the objecting
lens. When there is no emission, Auto Power Control circuit
or Optical Pick-up is broken.
Objective lens moves up and down three times for focus search.

S801

4

Location of controls

Inserting a cassette

With the side you want
to play facing you

CD, RADIO BAND/
AUTO PRESET, TAPE

OPR/BATT

MODE

LINE IN
(AEP, UK model only)

OPERATE

u

Loading a CD

ZPUSH

OPEN/CLOSE

PAUSE

STOP/EJECT

FF

i

SECTION 2

GENERAL

With the labeled side up

REC

PLAY

REW

Display

ZPUSH OPEN/CLOSE

Remote sensor

S-BASS

x

CSD-XD55

This section is extracted from
instruction manual.

Remote Control

SLEEP

FUNCTION POWER

Number buttons

MODE

.,>

N

X

BAND

SURROUND

POWER

SLEEPFUNCTION

(AC ONL

CD/RADIO

123

45

78

MODE

0/10

CD

RADIO TUNE

BAND

SURROUND

S-BASS

Y)

6

9

10

VOL

Ver 1.2

VOL +*,–

x

TUNE –,+

S-BASS

*The button has a tactile dot.

VOLUME –,+*

LINE

DISPLAY/ENTER/MEMORY

.,>

SURROUND

SLEEP

PRESET –,+

TUNE –,+

Display

EF

Total track number

Total playing time

Programmed track Playing order

5

CSD-XD55

SECTION 3

DISASSEMBLY

• The equipment can be removed using the following procedure.

3-1. DISASSEMBLY FLOW

SET

3-2 CABINET (TOP) ASSY

(Page 6)

3-3. CABINET (FRONT) ASSY,

CABINET (BOTTOM) ASSY

3-10. CD LID

(Page 11)

(Page 7)

3-4. WIRES

(Page 8)

3-5. MD BLOCK

(Page 9)

3-6. CASSETTE HOLDER

(Page 9)

3-7. MAIN BOARD

(Page 10)

3-13. R/P HEAD (HRP301),

3-8. TUNER BOARD

TC BOARD
(Page 13)

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

3-2. CABINET (TOP) ASSY

3

two

(+BV (B3

1

two

screws

)

(+BV (B3

)

(Page 10)

screws

)

)

3-11. CD BLOCK ASSY

(Page 12)

3-12. OPTICAL PICK-UP

(Page 12)

3-9. POWER BOARD

(Page 11)

3-14. MAIN BELT (B),

SUB BELT (B)
MOTOR ASSY (M301),
(Page 13)

8

connector

(CNP302)

7

connector

(CNP809)

6

CNP702

4

5

connector

(CNJ807)

2

screw

(+BV (B3

1

(+BV (B3

9

cabinet (top) assy

two

)

)

screws

)

)

6

3-3. CABINET(FRONT)ASSY, CABINET(BOTTOM)ASSY

y

6

two

screws

)

7

three

(+BV (B3

screws

(+BV (B3

)

)

)

qa

connector

(CNP810)

0

connector

(CNP305)

9

CNP805

5

(+BV (B3

screw

)

)

4

screw

(+BV (B3

CSD-XD55

)

)

qs

connector

(CNP806)

qd

CNP808

qg

cabinet (front) assy

qf

CNP801

8

three

(+BV (B3))

screws

1

battery lid

3

two

screws

(+BV (B3))

cabinet (bottom) ass

2

three

(+BV (B3))

screws

7

CSD-XD55

3-4. WIRES

Put flat cable and wires between the cabinets and push them in the
grooves located at A to I in the figure to prevent disconnection before
assembling the set.

from MAIN board

cabinet front

A

B

CD

E

F

G

cabinet bottom

H

I

8

)

3-5. MD BLOCK

2

two

(+BV (B3

4

MD block

3

two

(+BV (B3

screws

)

screws

CSD-XD55

)

)

)

cassette holder

3-6. CASSETTE HOLDER

1

2

damper

1

screw

(+BV (B3

)

4

cassette spring

3

cassette holder

9

CSD-XD55

)

3-7. MAIN BOARD

2

connector

(CNP304)

4

screw

(+BV (B3

1

(CNP811)

)

)

connector

3

two

screws

(+BV (B3

5

MAIN board

)

)

3-8. TUNER BO ARD

3

screws

(+BV (B3))

5

2

telescopic antenna

1

screws

(+P (M3

)

10

4

two claws

6

TUNER board

n

3-9. SELECT BOARD, POWER BOARD

1

connector

(CNP906)

4

two

screws

(+BV (B3))

5

two

screws

(+BV (B3))

6

screw

(+BV (B3))

7

POWER board

3

2

screw

(+BV (B3))

CSD-XD55

SELECT board

3-10. CD LID

2

projection

3

CD lid

1

projectio

CD spring

11

CSD-XD55

3-11. CD BLOCK ASSY

3

CD cover

3-12. OPTICAL PICK-UP

5

sled shaft

two claws

2

two

screws

(+PWH 2.6

4

x

10)

6

optical pick-up

two claws

4

CD block assy

1

two

screws

(+PWH 2.6

claw

1

gear (A)

2

(

x

10)

screw

PWB tapping (M2)

)

12

3

screw

(

PWB tapping (M2)

)

)

)

3-13. R/P HEAD(HRP301),TC BOARD

1

two claws

Remove the four solderings.

6

5

3

(+BVTT 2

4

lug

7

TC board

screw

CSD-XD55

x

4

2

R/P head (HRP301)

3-14. MAIN BELT, RF BELT, MOTER ASSY(M301)

main belt

4

7

8

motor bracket

3

2

screw

(

bind DT M2 x 6

1

(

motor assy (M301

screw

bind DT M2 x 6

)

)

5

RF belt

6

two

screws

(

pan M2.6 x 4.5

)

13

CSD-XD55

SECTION 4

MECHANICAL ADJUSTMENTS

SECTION 5

ELECTRICAL ADJUSTMENTS

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. (Do not bring the head magnetizer close to the
erase head.)

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

4. The adjustments should be performed with the rated power

supply voltage (9V) unless otherwise noted.

Torque Measurement

Mode Torque meter Meter reading

2.95 – 6.86 mN • m

FWD CQ-102C (30 – 70 g • cm)

(0.42 – 0.97 oz • inch)

FWD

Back Tension

FF CQ-201B (more than 60 g • cm)

REW CQ-201B (more than 60 g • cm)

CQ-102C (1.5 – 5.5 g • cm)

0.15 – 0.53 mN • m

(0.021 – 0.076 oz • inch)

more than 5.88 mN • m

(more than 0.83 oz • inch)

more than 5.88 mN • m

(more than 0.83 oz • inch)

Tape Tension Measurement

Mode Tension meter Meter Reading

FWD CQ-403A

more than 100 g

(more than 3.53 oz)

TAPE SECTION 0 dB = 0.775 V

• Standard Output Level

Output terminal HP OUT

load impedance 32 Ω

output signal level 0.25 V (–10 dB)

• Test T ape

Type Signal Used for

WS-48A 3 kHz, 0 dB tape speed adjustment

Tape Speed Adjustment

Procedure:

Mode: playback
Adjust so that the value on the digital frequency counter is
3,000 Hz.

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

set

i

jack (J321)

Specification Value:

Digital frequency counter

2,940 to 3,060 Hz

Adjust so that the frequency at the beginning and that at the end of
tape winding are between 2,970 to 3,030 Hz.

digital frequency
counter

Ω

32

Adjustment Location:

Tape speed adjustment
control inside motor

14

)

no mark : US, CND, E, SP < > : AEP, UK

TUNER SECTION 0 dB = 1 µV

• AM Section

Setting:

RADIO BAND•AUTO PRESET button: AM <MW and LW>

AM RF signal
generator

30% amplitude
modulation by
400 Hz signal

• FM Section

Setting:

RADIO BAND•AUTO PRESET button: FM

FM RF signal
generator

75 kHz frequency
deviation by 1 kHz signal
output level : as low as possible

• Connecting Level Meter (FM, AM<MW and LW>)

Put the lead-wire
antenna close to
the set.

TP (FM IN)

0.01

µ

F

set

CSD-XD55

Ver 1.2

• AEP, UK model

MW IF ADJUSTMENT

Adjust for a maximum reading on level meter.

T1

450 kHz

MW FREQUENCY COVERAGE

CHECK

Frequency Display 531 kHz 1,611 kHz
Reading on Digital voltmeter
Adjustment Part <confirmation> <confirmation>

MW TRACKING ADJUSTMENT

Adjust for a maximum reading on level meter.

L3-1 CT3

621 kHz 1,404 kHz

LW FREQUENCY COVERAGE

Frequency Display 153 kHz 279 kHz
Reading on Digital voltmeter 0.6 ± 0.3 V 5.0 ± 0.1 V
Adjustment Part <confirmation> L4

LW TRACKING ADJUSTMENT

Adjust for a maximum reading on level meter.

L3-2 CT5

162 kHz 261 kHz

• US, CND, E, SP model

AM IF ADJUSTMENT

Adjust for a maximum reading on level meter.

1.0 ± 0.5 V 5.2 ± 0.6 V

ADJUSTMENT

T1

450 kHz

level meter
(range: 0.5–5 V ac

32 Ω

set

i jack (J321)

• Connecting Digital Voltmeter (FM, AM <MW and LW>)

digital
voltmeter

100 kΩ

TP (VT)

• Repeat the procedures in each adjustment several times, and the
frequency coverage and tracking adjustments should be finally
done by the trimmer capacitors.

• Abbreviation

CND : Canadian model
SP : Singapore model

AM FREQUENCY COVERAGE

ADJUSTMENT

Frequency Display 530 kHz 1,710 kHz
Reading on Digital voltmeter 1.0 ± 0.05 V 5.3 ± 0.7 V
Adjustment Part L4 <confirmation>

AM TRACKING ADJUSTMENT

Adjust for a maximum reading on level meter.

L3-2 CT3

620 kHz 1,400 kHz

FM IF ADJUSTMENT

Adjust for a maximum reading on level meter.

T2

10.7 MHz

FM FREQUENCY COVERAGE

ADJUSTMENT

Frequency Display 87.5 MHz 108 MHz
Reading on Digital voltmeter 1.3 ± 0.3 V 3.0 ± 0.2 V
Adjustment Part <confirmation> L2

FM TRACKING ADJUSTMENT

Adjust for a maximum reading on level meter.

L1 CT1

87.5 MHz 108 MHz

Adjustment Location: See page 16.

15

CSD-XD55

Adjustment Location:

– MAIN board (component side) –

TP (FM IN)

(CONDUCTOR SIDE)

T1

AM<MW>

IF

ADJUSTMENT

ADJUSTMENT

T2
FM

IF

T1

T2

CT3,L3-2

AM

TRACKING

ADJUSTMENT

L3-2 L3-1

L1

CT1

IC1

CT1, L1

FM

TRACKING

ADJUSTMENT

L2

L2

FM

FREQUENCY

COVERAGE

ADJUSTMENT

CT5, L3-2

LW

TRACKING

ADJUSTMENT

CT3

L4

CT5

L4

AM<LW>

FREQUENCY

COVERAGE

ADJUSTMENT

TP (VT)

(CONDUCTOR SIDE)

CT3, L3-1

MW

TRACKING

ADJUSTMENT

IC2

CD SECTION

CD section adjustments are done automatically in this set.
In case of operation check, confirm that focus bias.

FOCUS BIAS CHECK

1. Connect the oscilloscope between TP (RF) and TP (VREF).

2. Insert the disc (YEDS-18). (Part No. : 3-702-101-01)

3. Press the N X (CD) button.

4. Confirm that the oscilloscope waveform is as shown in the
figure below. (eye pattern)
A good eye pattern means that the diamond shape ( ) in
the center of the waveform can be clearly distinguished.

• RF signal reference waveform (eye pattern)

VOLT/DIV : 50 mV (10 : 1 probe in use)
TIME/DIV : 500 nS

RF level :

0.85 ± 0.2 Vp-p

When observing the eye pattern, set the oscilloscope for AC range
and raise vertical sensitivity.

Test Point:

– CD board (conductor side) –

TP

(VREF)

C739

32

oscilloscope

R736

R706

R701

C707

JW709

R734

TP(VREF)

R710

R733

R735

JW708

R709

C736

JC703

TP(RF)

R711

C705

C708

JW707

R713

TP

(RF)

C734

C742

C704

R708

JW726

C731

C743

JW725

R729

C703

IC701

16

JW706

R723

C709

C711

HP board

CONTROL board

TC board

TUNER board

SELECT board

BATTERY (1) board

BATTERY (2) board

MAIN board

CD board

POWER board

SECTION 6

DIAGRAMS

6-1. IC PIN DESCRIPTION

• IC802 uPD789477GC-A42-8BT (SYSTEM CONTROLLER)

Pin No. Pin Name I/O Pin Description

1, 2 NC — Not used. (Open)
3 to 5 VLC2 to 0 I LCD drive bias voltage input
6 to 9 COM0 to 3 O LCD drive common output

10 to 26 S0 to 16 O LCD drive segment output

27 REC I Tape record signal input H: REC
28 AC-CHK I AC power supply detection signal input L: AC in
29 CD-DOOR I CD door open/close switch input L: Close
30 HP DET – Not used.
31 B/LIGHT CONT O Back light ON/OFF control output.
32 SURROUND CONT O Sorround ON/OFF control output.
33 NC – Not used. (Open)
34 LINE IN O LINE IN signal output
35 A-MUTE O Audio mute output H: Mute
36 CD O CD function output H: CD
37 TAPE O Tape function output H: Tape
38 AVDD — Analog power supply pin for A/D converter (+3.3 V)
39 BTT-CHK-H I Battery check input for Hi-voltage
40 BTT-CHK-M I Battery check input for Mid-voltage

41, 42 V CHECK I Not used. (Open)

43 to 45 KEY3 to 1 I Key input

46 MODE CHK I Destination setting input
47 AGND — Analog ground for A/D converter
48 RMC IN I Sircs receiver data input
49 TC-PLAY I Tape play switch input L: Play
50 W-UP/INI O Wake-up/Initial setting read signal output
51 3.3V MONITOR I 3.3V MONITOR signal input
52 C-WRQ I CD write request data input
53 C-DOUT I CD digital signal processor data input
54 C-DIN O CD digital signal processor data output
55 C-CLK I CD serial data transfer clock signal input
56 R-COUNT I Tuner PLL IF count input
57 R-DATA O Tuner PLL data output
58 R-CLK O Tuner PLL clock output
59 R-LAT O Tuner PLL latch output
60 B-MUTE O Tuner mute signal output H: Mute
61 C-DRF I CD DRF signal input
62 C-CE O CD chip enable output
63 C-FSEQ I CD frame SYNC input
64 C-XRST O CD system reset output
65 P-CON O System power control output H: PCON
66 ISS1 O ISS1 output
67 ISS2 O ISS2 output
68 DBB O MEGA BASS control output H: MEGA BASS off, L: MEGA BASS on
69 ICO I Connected to VSS.
70 XT1 I Sub system oscillation input (32.768 kHz)
71 XT2 O Sub system oscillation output (32.768 kHz)

CSD-XD55

Pin No. Pin Name I/O Pin Description

72 VDD — Main power supply pin for A/D converter (+3.3 V)
73 VSS — Main ground
74 X1 I Main system oscillation input (4.19 MHz)
75 X2 O Main system oscillation output (4.19 MHz)
76 RST I System reset input
77 V-CLK O Volume clock output
78 V -DATA O Volume data output
79 SCL O EEPROM clock output
80 SDA I/O EEPROM input/output

6-2. CIRCUIT BOARDS LOCATION

17 17