E-F Balance Check
CD SECTION
Adjustment Location : MAIN board (See page 23)
Notes on Check
This check is to be done when the optical pick-up block is replaced.
1. Perform the traverse check in the CD test mode.
After check, be sure to exit the test mode.
Check Procedure:
2. Perform check in the order given.
1. Connect the oscilloscope to test point TP (VC) and TP (TE) on
3. Use the disc (YEDS-18, Parts No. 3-702-101-01) only when
MAIN board.
so indicated.
2. Put the set into test mode.
3. Optical pick-up setting to the center by + or = button
Before Check
pushing.
Put the set into test mode and perform the following checks.
4. Insert disk (YEDS-18) and press ^ button.
Repair if there are any problems.
5. Check that the oscilloscope traverse waveform is symmetrical,
as shown in the figure below.
Y Sled Motor Check
6. Release test mode after adjustment is completed.
Press + , = keys and confirm that the Optical pick-up moves
smoothly from the innermost to outermost circumference and back
smoothly and with no catching or abnormal noises.
(Cancellation of BTL mute)A
+ : Optical pick-up moves to the outer circumference.VOLT/DIV : 0.1V
0V
TIME/DIV : 1ms
= : Optical pick-up moves to the inner circumference.
B
YFocus Search CheckC
A = B C = 500mV ? 100mV
1. Press the CD ^ key. (Focus search operation is performed
continuously.)
2. Look at the Optical pick-up objective lens and confirm that it
[MAIN BOARD]
moves up and down smoothly, with no catching or abnormal
noises.
3. Press p button.
Confirm that focus search operation stops. If it does not, press
p button again longer.
How to Enter the Set into Test Mode
1. Turn the AC CORD IN (Adaptor).
(LCD 501 indicator blinks the test mode pattern.)
2. Short-circuit between the lands as shown on the control (1)TP(FE)
board.TP(VC)
How to Exit the Test Mode
Turn the POWER OFF.
TP(TE)
[CONTROL (1) BOARD]
TP(RF)
Osilloscope
(DC range)
TP(TE)
+
�
TP(VC)
Jumper wire
Test portion
Short : Test mode
Open : Normal mode
N 14 N |
ACEC
SONY
