7-1. Case and Back Panel Section ............................................... 27
7-2. Front Panel Section .............................................................. 28
7-3. CD Mechanism Section (CDM37-5BD19).......................... 29
7-4. Base Unit Section (BU-5BD19)........................................... 30
8. ELECTRICAL PARTS LIST ......................................... 31
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 P AR UNE MARQUE ! SUR
LES DIAGRAMMES SCHÉMATIQUES ET LA LISTE DES
PIÈCES SONT CRITIQUES POUR LA SÉCURITÉ DE
FONCTIONNEMENT. NE REMPLACER CES COMPOSANTS
QUE P AR DES PIÈCES SONY DONT LES NUMÉROS SONT
DONNÉS DANS CE MANUEL OU DANS LES
SUPPLÉMENTS PUBLIÉS PAR SONY.
— 2 —
MODEL IDENTIFICATION
123
123
123
— BACK PANEL —
4-982-187-
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.
0π: US model
1π: Canadian model
2π: Australian model
3π: AEP, German model
5π: UK model
7π: E model
8π: Singapore model
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 v oltage drop across a resistor by means of a V OM
or battery-operated AC voltmeter. T he “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
0.15µF
1.5k
Ω
AC
voltmeter
(0.75V)
Earth Ground
Fig. A. Using an AC voltmeter to check AC leakage.
— 3 —
SECTION 1
SERVICING NOTE
How to take out a compact disc when the power is turn OFF.
Compact disc
Rotate the table motor into the
direction of arrow, lef the spindle
motor down and take out the
compact disc.
Compact disc
Spindle motor
Table motor
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 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 OPERA TION CHECK
Carry out the “S curve check” in “CD section adjustment” and
check that the S curve waveform is output.
— 4 —
LOCATION OF CONTROLS
SECTION 2
GENERAL
1
1 POWER switch
2 Front cover
3 OPEN switch
4 Display window
5 CONTINUE button
6 SHUFFLE button
7 PROGRAM button
* AMS is the abbreviation for Automatic Music Sensor.
— 5 —
SECTION 3
DISASSEMBLY
Note: Follow the disassembly procedure in the numerical order given.
3-1. FRONT PANEL BLOCK
1
Remove the case.
Claw
4
Two screws (BVTT 3x8)
2
Flat type wire (19 core)
(Main board, CN302)
Claw
3-2. CD MECHANISM DECK
5
4
Three screws (BVTT 3x6)
CD mechanism deck
3
Screw (BVTT 3x8)
3
Two screws (BVTT3x6)
2
Connector 9P
(Main board, CN303)
1
Flat type wire (20 core)
(Main board, CN304)
— 6 —
3-3. BU BRACKET ASSEMBLY
2
BU bracket assembly
1
Yoke bracket
3-4. 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.
A
3
Bracket (BU)
1
Screw (BVTP 3x8)
2
Screw (BVTP 3x8)
4
Step screw
5
Disc table
— 7 —
A
SECTION 4
TEST MODE
4-1. AF MODE
The following checks can be performed in the AF mode, which is
set by connecting the test point (AFJ) terminal on DISPLAY
board to the Ground and turning on the power.
• FL tube check
After all segments light up, when the ≠0 button is pressed,
the following will be displayed. (Partial lighting 1)
(Partial lighting 1)
When the )± button is pressed, the following will be displayed. (partial lighting 2)
(Partial lighting 2)
When the p button is pressed, all will light up again.
4-2. ADJ MODE
The following operations are performed in the ADJ mode, which
is set by connecting the test point (ADJ) terminal to the Ground and
turning on the power.
• Servo related manual operations and measurement can be
performed.
(For details of operations, refer to Table of Key Operations in ADJ
Mode.)
TABLE OF BUTTON OPERATIONS IN ADJ MODE
The functions of the number buttons are shown in the following
table.
FUNCTIONS OF NUMBER BUTTONS
(Use the widely use remote commander with 20 keys.)
Button
15
16
17
18
19
20
S curve check (in stop mode)
Tracking servo, sled servo off
Tracking servo, sled servo on
E-F balance indication
E-F balance indicati down
E-F balance indication up
Function
• Key check
All buttons have corresponding button numbers. When a button
is pressed, the counter will count up and display the button’ s number. How ever , the counter will only count to “14”. It will not count
for buttons already pressed once, but will display the button’ s number.
Â
Display of counting
ButtonButton
· P
p
≠ 0
) ±
DISC 1
DISC 2
DISC 3
Button No.
Displayed
07
All lit
Partial lighting 1
Partial lighting 2
08
09
10
DISC 4
DISC 5
CONTINUE
SHUFFLE
PROGRAM
REPEAT
DISC SKIP
Â
Display of button
number
Button No.
Displayed
18
17
13
12
11
19
20
[ DISPLAY BOARD ] — Conductor Side —
IC401
R404
TP
ADJ
R405
TP
AFJ
— 8 —
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