SONY cdp-cx70 Service Manual

CDP-CX70ES/CX255

SERVICE MANUAL

Photo : CDP-CX255

Model Name Using Similar Mechanism CDP-CX250
CD Mechanism Type CDM-40
Base Unit Type KSM-213BKN/M-N
Optical Pick-up Type KSS-213B/S-N

SPECIFICATIONS

US Model

Canadian Model

MICROFILM

COMPACT DISC PLAYER

— 1 —

TABLE OF CONTENTS

1. SERVICING NOTE

.......................................................... 3

2. GENERAL .......................................................................... 6

3. DISASSEMBLY

3-1. Front Panel Assembly ......................................................... 14

3-2. Back Panel .......................................................................... 14

3-3. T able Assembly...................................................................15

3-4. Mechanism Deck ................................................................ 16

3-5. Base Unit.............................................................................16

4. TEST MODE ..................................................................... 17

5. MESHANICAL ADJUSTMENTS .............................. 20

6. ELECTRICAL ADJUSTMENTS ............................... 26

7. DIAGRAMS

7-1. Circuit Boards Location ...................................................... 29

7-2. IC Pin Functions ................................................................. 31

7-3. Block Diagrams

• BD Section....................................................................... 33

• Main Section .................................................................... 35

7-4. Printed Wiring Board — BD Section —............................. 37

7-5. Schematic Diagram — BD Section — ............................... 39

7-6. Schematic Diagram — Main Section (1/2) —.................... 41

Schematic Diagram — Main Section (2/2) —.................... 43

7-7. Printed Wiring Board — Main Section — .......................... 45

7-8. Printed Wiring Board — Sensor Section — ....................... 47

7-9. Schematic Diagram — Sensor Section — .......................... 48

7-10. Printed Wiring Board — Jack Section — ......................... 49

7-11. Schematic Diagram — Jack Section — ............................ 51

7-12. Printed Wiring Board — Display Section —.................... 53

7-13. Schematic Diagram — Display Section —....................... 55

7-14. IC Block Diagrams............................................................ 57

MODEL IDENTIFICATION
— BACK PANEL —

PARTS No.

4-982-813-7
4-982-813-8
4-983-366-5
4-983-366-6

CAUTION

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

CX255 : US model
CX255 : Canadian model
CX70ES : US model
CX70ES : Canadian model

MODEL

8. EXPLODED VIEWS

8-1. Case Section........................................................................ 62

8-2. Disc table Section ............................................................... 63

8-3. Front panel Section ............................................................. 64

8-4. Mechanism Section-1 (CDM-40) ....................................... 65

8-5. Mechanism Section-2 (CDM-40) ....................................... 66

8-6. Base Unit Section-1 (KSM-213BKN/M-N) ....................... 67

8-7. Base Unit Section-2 (KSM-213BKN/M-N) ....................... 68

9. ELECTRICAL PARTS LIST ........................................ 69

— 2 —

SECTION 1

SERVICING NOTE

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 A C 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 microampers). 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 A C v oltmeter. 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)

To Exposed Metal
Parts on Set

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.

LASER DIODE AND FOCUS SEARCH OPERATION
CHECK

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

0.15

Ω

µ

F

1.5k

Earth Ground

AC
voltmeter
(0.75V)

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

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.

ATTENTION AU COMPOSANT AYANT RAPPORT

À LA SÉCURITÉ!!
LES COMPOSANTS IDENTIFIÉS P AR UNE MARQUE ! SUR
LES DIAGRAMMES SCHÉMATIQUES ET LA LISTE DES
PIÈCES SONT CRITIQUES POUR LA SÉCURITÉ DE
FONCTIONNEMENT . NE REMPLA CER CES COMPOSANTS
QUE PAR DES PIÈCES SONY DONT LES NUMÉROS
SONT DONNÉS DANS CE MANUEL OU DANS LES
SUPPLÉMENTS PUBLIÉS PAR SONY.

— 3 —

CD-TEXT TEST DISC

This unit is able to display the test data (character information) written in the CD on its fluorescent indicator tube.
The CD-TEXT TEST DISC (TGCS-313:4-989-366-01) is used for checking the display.
To check, perform the following procedure.

Checking Method:

1. Turn ON the power, set the disc on the disc table with the side labeled as ‘’test disc” as the right side, close the front cov er , and chuck the
disc.

2. Press the · button and play back the disc.

3. The following will be displayed on the fluorescent indicator tube.

Display : 1kHz/0 dB/ L&R

4. Press the ≠ and ± buttons to switch the track. The text data of each track will be displayed.
For details of the displayed contents for each track, refer to “Table 1 : CD-TEXT TEST DISC TEXT Data Contents” and “Table 2 : CD­TEXT TEST DISC Recorded Contents and Display”.

Restrictions in CD-TEXT Display

In this unit, some special characters will not be displayed properly. These will be displayed as a space or a character resembling it. For details,
refer to “Table 2 : CD-TEXT DISC Recorded Contents and Display”.

Table 1 : CD-TEXT TEST DISC TEXT Data Contents (TRACKS No. 1 to 41:Normal Characters)

TRACK

No.

1
2
3
4
5
6
7
8

9
10
11
12
13
14
15
16
17
18
19
20
21

Displayed Contents

1kHz/0dB/L&R
20Hz/0dB/L&R
40Hz/0dB/L&R
100Hz/0dB/L&R
200Hz/0dB/L&R
500Hz/0dB/L&R
1kHz/0dB/L&R
5kHz/0dB/L&R
7kHz/0dB/L&R
10kHz/0dB/L&R
16kHz/0dB/L&R
18kHz/0dB/L&R
20kHz/0dB/L&R
1kHz/0dB/L&R
1kHz/-1dB/L&R
1kHz/-3dB/L&R
1kHz/-6dB/L&R
1kHz/-10dB/L&R
1kHz/-20dB/L&R
1kHz/-60dB/L&R
1kHz/-80dB/L&R

TRACK

No.

22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41

Displayed Contents

1kHz/-90dB/L&R
Infinity Zero w/o emphasis//L&R
Infinity Zero with emphasis//L&R
400Hz+7kHz(4:1)/0dB/L&R
400Hz+7kHz(4:1)/-10dB/L&R
19kHz+20kHz(1:1)/0dB/L&R
19kHz+20kHz(1:1)/-10dB/L&R
100Hz/0dB/L*
1kHz/0dB/L*
10kHz/0dB/L*
20kHz/0dB/L*
100Hz/0dB/R*
1kHz/0dB/R*
10kHz/0dB/R*
20kHz/0dB/R*
100Hz Squer Wave//L&R
1kHz Squer Wave//L&R
1kHz w/emphasis/-0.37dB/L&R
5kHz w/emphasis/-4.53dB/L&R
16kHz w/emphasis/-9.04dB/L&R

NOTE : The contents of Track No. 1 to 41 are the same as those of the current TEST DISC-their titles are displayed.

— 4 —

Table 2: CD-TEXT TEST DISC Recorded Contents and Display

(In this unit, some special characters cannot be displayed. This is no a fault.)

TRACK

No.

42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67

to

99

Recorded contents

! ” # $ % & ´ (21h to 27h)1kHz 0dB L&R
( ) + , – . / (28h to 2Fh)

*

01234567 (30h to 37Fh)

8 9 : ; < = > ? (38h to 3Fh)
@A B CD E F G (40h to 47Fh)
H I J K L MN O (48h to 4Fh)

P Q R S T U VW (50h to 57Fh)

X Y Z [ ¥ ] ^ _ (58h to 5Fh)

a b c d e f g (60h to 57Fh)

′

h i j k l mn o (68h to 6Fh)

p q r s t u v w (70h to 77Fh)

xyz{I }

~

(78h to 7Fh)

i¢£¤¥ § (A0h to A7h) 8859-1

¬

–

≥ C ª

•±23

1

†

PR

µ¶ • (B0h to B7h)

′

1

1

º ¿ (B8h to BFh)

4

2

3
4

(A8h to AFh)

АБВГДЕЖЗ (C0h to C7Fh)
ИЙКЛМНОП (C8h to CFh)
D СТУФХЦ
ШЩЪЫЬY

˙

(C0h to C7Fh)

Я (D8h to DFh)
абвгдежз (E0h to E7Fh)
ийклмноп (E8h to FFh)
∂ стуфхц÷ (F0h to F7Fh)
шщъыьy

ÿ (F8h to FFFh)

´

No.66
No.67
to
No.99

Display

N All the same
N All the same
N All the same
N All the same
N All the same
N All the same
N All the same

X Y Z [ ] ^ _ (58····

/

N All the same
N All the same
N All the same

x y z { I } (78····

~

is not displayed

(A0···· All not displayed

(A8···· All not displayed

(B0···· All not displayed

(B8···· All not displayed
AAAAAA C (C0···· Æ is not displayed
EEEEIIII (C8
D NOOOOO (D0····
O UU UU Y (D8····

is not displayed

ß are not displayed
a a a a a a c (E0···· æ is not displayed
e e e e i i i i (E8····
dnooooo (F0···· ÷ is not displayed
o u u u u y y (F8····

is not displayed

N All the same
N All the same

to

N All the same

— 5 —

Location of Parts and Controls

SECTION 2

GENERAL

1

1 POWER switch
2 CONTINUE button
3 SHUFFLE button
4 Display window
5 PROGRAM button
6 REPEAT button
7 TIME/TEXT button
8 Front cover

9 MEMO SEARCH button
10 INPUT button
11 Remote sensor

2 3 8 9 10 12 13 14 15

20

12 JOG dial
13 ENTER button
14 CHECK button
15 CLEAR button
16 p button
17 P button
18 · button
19 OPEN button
20 ≠/± button
21 GROUP 1-8 button
22 TIMER switch

192122

114567

161718

— 6 —

— 7 —

This section is extracted from

instruction manual.

— 8 —

— 9 —

— 10 —

— 11 —

— 12 —

— 13 —

3-1. FRONT PANEL ASSEMBLY

1

Two screws
(BVTP 3x8)

2

8

Front panel assembly

Two screws
(BVTP 3x8)

SECTION 3

DISASSEMBLY

7

Remove the claw

5

Flat type wire (19 core)
(Main board, CN403)

6

Remove the claw

4

Two screws (BVTT 3x6)

3-2. BACK PANEL

7

Remove the PC board holder

4

Screw (BVTT 3x6)

3

Three screws (BVTT3x6)

1

Connector (CN905)

2

Four screws
(BVTT 3x6)

5

Two screws
(BVTT 3x6)

6

Screw
(BVTT 3x6)

3

Four screws
(BVTT 3x6)

— 14 —

8

Back panel

3-3. T ABLE ASSEMBLY

3

Screw (PSW 3x6)

2

Three screws (BVTT 3x6)

Main board

4

Connector (CN309)

5

Guide assembly

1

Screw (BVTT 3x6)

!™

!¡

Washer

Table assembly

6

Stop ring (E type)

7

Screw (BVTT 3x6)

8

Holder assembly

9

Screw
(BVTT 3x6)

0

Holder assembly

— 15 —