Sony CDP-CX255 / CDP-CX70ES / CDP-CX88ES Service Manual ▷ View online
— 1 —
SPECIFICATIONS
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
SERVICE MANUAL
MICROFILM
Photo : CDP-CX255
COMPACT DISC PLAYER
CDP-CX70ES/CX255
US Model
Canadian Model
— 2 —
4-982-813-7
4-982-813-8
4-983-366-5
4-983-366-6
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. Table Assembly ................................................................... 15
3-4. Mechanism Deck ................................................................ 16
3-5. Base Unit ............................................................................. 16
3-2. Back Panel .......................................................................... 14
3-3. Table 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
7-2. IC Pin Functions ................................................................. 31
7-3. Block Diagrams
• BD Section ....................................................................... 33
• Main Section .................................................................... 35
• 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
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
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
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
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
MODEL IDENTIFICATION
— BACK PANEL —
— BACK PANEL —
CX255
: US model
CX255
: Canadian model
CX70ES : US model
CX70ES : Canadian model
PARTS No.
MODEL
CAUTION
Use of controls or adjustments or performance of procedures
other than those specified herein may result in hazardous ra-
diation exposure.
other than those specified herein may result in hazardous ra-
diation exposure.
— 3 —
SAFETY CHECK-OUT
After correcting the original service problem, perform the follow-
ing 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.
ing 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 microampers). Leak-
age current can be measured by any one of three methods.
1. A commercial leakage tester, such as the Simpson 229 or RCA
from all exposed metal parts to any exposed metal part having a
return to chassis, must not exceed 0.5 mA (500 microampers). Leak-
age 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.
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 pas-
sive VOM that is suitable. Nearly all battery operated digital
multimeters that have a 2V AC range are suitable. (See Fig. A)
V, so analog meters must have an accurate low-voltage scale.
The Simpson 250 and Sanwa SH-63Trd are examples of a pas-
sive VOM that is suitable. Nearly all battery operated digital
multimeters that have a 2V AC range are suitable. (See Fig. A)
Fig. A. Using an AC voltmeter to check AC leakage.
To Exposed Metal
Parts on Set
Parts on Set
0.15
µ
F
1.5k
Ω
AC
voltmeter
(0.75V)
voltmeter
(0.75V)
Earth Ground
NOTES ON HANDLING THE OPTICAL PICK-UP BLOCK
OR BASE UNIT
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.
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 pick-
up block. Therefore, when checking the laser diode emission, ob-
serve from more than 30 cm away from the objective lens.
the disc reflective surface by the objective lens in the optical pick-
up block. Therefore, when checking the laser diode emission, ob-
serve from more than 30 cm away from the objective lens.
LASER DIODE AND FOCUS SEARCH OPERATION
CHECK
CHECK
Carry out the “S curve check” in “CD section adjustment” and check
that the S curve waveform is output repeatedly.
that the S curve waveform is output repeatedly.
SECTION 1
SERVICING NOTE
SAFETY-RELATED COMPONENT WARNING !!
COMPONENTS IDENTIFIED BY MARK
!
OR DOTTED 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 PAR UNE MARQUE
!
SUR
LES DIAGRAMMES SCHÉMATIQUES ET LA LISTE DES
PIÈCES SONT CRITIQUES POUR LA SÉCURITÉ DE
FONCTIONNEMENT. NE REMPLACER CES COMPOSANTS
QUE PAR DES PIÈCES SONY DONT LES NUMÉROS
SONT DONNÉS DANS CE MANUEL OU DANS LES
SUPPLÉMENTS PUBLIÉS PAR SONY.
— 4 —
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.
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 cover, 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 : CD-
TEXT TEST DISC Recorded Contents and Display”.
TEXT 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”.
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)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
TRACK
No.
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
NOTE : The contents of Track No. 1 to 41 are the same as those of the current TEST DISC-their titles are displayed.
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
TRACK
No.
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
Displayed Contents
