7-3. Base Unit Section (BU-5BD22).......................................... 35
8. ELECTRICAL PARTS LIST ........................................ 36
MODEL IDENTIFICATION
– BACK PANEL –
Parts No.
MODEL
AEP, EE, CIS
UK
• Abbreviation
EE: East European model
PARTS No.
4-987-946-0
4-987-946-1
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.
— 2 —
SECTION 1
SERVICING NOTE
HOW TO OPEN THE DISC TRAY WHEN POWER SWITCH
TURNS OFF
Insert a tapering driver into the aperture of the unit bottom, and turn
in the direction of arrow.
*
To close the disc table, turn the driver in the reverse direction.
Pull out disc table
CD-TEXT TEST DISC
This unit is able to display the text data (character information)
written in the CD on its fluorescent indicator tube.
The CD-TEXT TEST DISC (TGCS-313: J-2501-126-A) is used
for checking the display.
To check, perform the following procedure.
Procedure:
1. Turn ON the power and set the test 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. Rotate the ≠ AMS ± knob to switch the track. The text
data of each track will be displayed.
Restrictions in CD-TEXT Contents and Display
The micro processor’s RAM has limit of capacity in this unit, The
display may not show all the track titles in a disc when you play the
CD TEXT TEST DISC, but it is not unusual. In that case, “NOT
DISPLAY” appears in the display.
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 OPERATION
CHECK
Carry out the “S curve check” in “CD section adjustment” and
check that the S curve waveform is output two times.
— 3 —
LOCATION OF PARTS AND CONTROLS
Front Panel
SECTION 2
GENERAL
1
1 POWER switch
2 PLAY MODE button
3 REPEAT button
4 TIME button
5 Disc tray
6 § OPEN/CLOSE button
7 0/) buttons
8 CHECK button
9 CLEAR button
!º ENTER button
3425
!•
!ª
!¡ ≠ AMS* ± knob
!™ PHONES jack
!£ p (stop) button
!¢ P (pause) button
!∞ · (play) button
!§ Display window
!¶ MUSIC SCAN button
!• PEAK SEARCH button
!ª EDIT/TIME FADE button
* AMS is the abbreviation for Automatic Music Sensor.
6
7890
!¡
!™!£!¢!∞!§!¶
— 4 —
SECTION 3
DISASSEMBLY
Note : Follow the disassembly procedure in the numerical order given.
3-1. FRONT PANEL
• In order to remove the front panel block when the power supply
does not turn on, rotate the cam with tapering driver as the figure
shows, and the loading part will be moved.
Then pull out the loading part by your hand to remove the loading panel as the figure shows. After that take out the front panel
block.
Loading part
3-2. BASE UNIT (BU-5BD22)
Tapering driver
3
Y oke bracket
Loading panel
1
Turn the cam to the direction of arrow (counter clock wise)
by tapering driver.
2
Take off the disc table.
BU-5BD22
4
Remove the Base unit
(BU-5BD22) to the direction
of arrow.
— 5 —
SECTION 4
TEST MODE
4-1. AF MODE
The following checks can be performed in the AF mode, which is
set by connecting the TP2 (AFADJ) terminal on MAIN
board to the Ground and turning on the power.
• FL tube check
After all segments light up, when the · button is pressed, the
following will be displayed. (Partial lighting 1)
ABCDEF
(Partial lighting 1)
When the p button is pressed, the following will be displayed.
(partial lighting 2)
(Partial lighting 2)
The display will light up as follows (partial lighting 3) when the
≠ AMS ± knob is rotated to the right, and as follows (par-
tial lighting 4) when rotated to the left.
Button
CHECK
)
0
P
ENTER
CLEAR
MUSIC SCAN
PEAK SEARCH
EDIT/
TIME FADE
• Remote commander check
When buttons other than the · button are pressed when the
whole display is lit, the display will change to partial lighting 2.
When the “·” button is pressed, the display will light up as
follows.
Button No.
Displayed
0
1
2
4
6
7
9
10
11
Button
PLAY MODE
REPEAT
TIME
OPEN/
CLOSE §
PLAY ·
STOP p
Button No.
Displayed
12
13
14
All lit
Partial lighting 1
Partial lighting 2
REMOCON PLAY
(Partial lighting 5)
JOGRIGHT
(Partial lighting 3)
JOGLEFT
(Partial lighting 4)
When the OPEN/CLOSE § button is pressed, all will light up
again.
• 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 “15”. It will not count
for buttons already pressed once, but will display the button’s
number.
88 TOTAL= 88
Â
Display of button number
Â
Display of counting
— 6 —
4-2. ADJ MODE
The following operations are performed in the ADJ mode, which
is set by connecting the TP1 (ADJ) terminal to the Ground and
turning on the power.
• During playback, there is no problem even if the GFS is continuously LOW.
• High speed search is prohibited during access.
• During playback, the gain of focus servo and spindle servo does
not decrease.
• Servo related manual operations and measurement can be
performed.
(For details of operations, refer to Table of Button Operrations in
ADJ Mode.)
Table of Button Operations in ADJ Mode
The jitter value display mode can be set after the all-music
remaining number mode using the TIME button.
The functions of the number buttons are shown in the following
table.
Function of Number Buttons
(With the Attached Remote Commander)
[ MAIN BOARD ] — Component Side —
IC631
CN621
R621
TP2 (AFADJ)
R622
TP1 (ADJ)
IC621
Button
1
2
3
4
5
6
7
8
10
Focus bias 8-step up
Middle of focus bias up/down turning point
Tracking servo, sled servo off
Auto gain initialization
Focus servo off
Focus bias 8-step down
Immediate readjustment of focus bias
Tracking servo, sled servo on
Auto focus bias start point
Function
4-3. CLV-S MODE
The spindle servo for playback sets into the CLV-S mode when
the TP2 (AFADJ) terminal is connected to Ground after turning on
the power.
— 7 —
SECTION 5
ELECTRICAL BLOCK CHECKING
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 10MΩ 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
oscilloscope
BD board
TP (FE)
TP (VC)
Procedure :
1. Connect oscilloscope to test point TP (FE) on BD board.
2. Connect between test point TP (FEI) and TP (VC) by lead wire.
3. Turn Power switch on.
4. Put disc (YEDS-18) in and turn Power switch on again and actuate the focus search. (actuate the focus search when disc table
is moving in and out.)
5. Check the oscilloscope waveform (S-curve) is symmetrical
between A and B. And confirm peak to peak level within 3±1
Vp-p.
S-curve waveform
symmetry
A
within 3 ± 1 Vp-p
B
Note:
A clear RF signal waveform means that the shape “◊” can be clearly
distinguished at the center of the waveform.
1. Connect oscilloscpe to test point TP (TE) on BD board.
2. Turn Power switch on.
3. Put disc (YEDS-18) in to play the number five track.
4. Press the “P (Pause)” button. (Becomes the 1 track jump mode)
5. Check the level B of the oscilliscope's wa veform and the A (DC
voltage) of the center of the Traverse waveform.
Confirm the following :
A/B x 100 = less than ± 22%
1 track jump waveform
Center of the waveform
6. After check, remove the lead wire connected in step 2.
Note :
• Try to measure several times to mak e 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
oscilloscope
BD board
TP (RF)
TP (VC)
Procedure :
1. Connect oscilloscope to test point TP (RF) on BD board.
2. Turn Power switch on.
3. Put disc (YEDS-18) in to play the number five track.
4. Confirm that oscilloscope waveform is clear and check RF sig-
nal level is correct or not.
B
0V
level : 1.3 ± 0.6 Vp-p
symmetry
A (DC voltage)
E-F Balance Check (With remote commander)
oscilloscope
BD board
TP (TE)
TP (VC)
Procedure :
1. Connect the test point TP1 (ADJ) on MAIN board to the ground
with a lead wire on main board.
2. Connect oscilloscpe to test point TP (TE) on BD board.
3. Turn the Power switch on to set the ADJ mode.
4. Put disc (YEDS-18) in to play the number five track.
5. Press the “3” button. (The tracking servo and the sledding servo
are turned OFF.)
— 8 —
6. Check the level B of the oscilliscope's waveform and the A (DC
voltage) of the center of the Traverse waveform.
Confirm the following :
A/B x 100 = less than ± 22%
Traverse waveform
Center of the waveform
B
RF PLL Free-run Frequency Check
Procedure :
1. Connect frequency counter to test point (PLCK) with lead wire.
BD board
TP (PLCK)
frequency counter
0V
A (DC voltage)
level : 1.3 ± 0.6 Vp-p
7. Press the “8” button. (The tracking servo and sledding servo are
turned ON.) Confirm the C (DC voltage) is almost equal to the
A (DC voltage) is step 6.
Traverse waveform
0V
Tracking servo
Sledding servo
OFF
Tracking servo
Sledding servo
ON
C (DC
voltage)
8. Disconnect the lead wire of TP1 (ADJ) connected in step 1.
2. Turn Power switch on.
3. Put the disc (YEDS-18) in to play the number five track.
Confirm that reading on frequency counter is 4.3218MHz.