Read Sony CFD-575 / CFD-577 Service Manual online
– 10 –
CD SECTION
Note on Adjustment
1. Perform adjustment in test mode.
After adjustment, be sure to release test mode.
2. Perform adjustments in the order given.
3. Use the disc (YEDS-18. Part No. 3-702-101-01) only when so
3. Use the disc (YEDS-18. Part No. 3-702-101-01) only when so
indicated.
Before adjustment
Put the set into test mode and perform the following checks.
Repair if there are any problems.
• Sled Motor Check
1. Press
Repair if there are any problems.
• Sled Motor Check
1. Press
^ button, then press OFF button.
2. Press
+, =buttons 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)
and back smoothly and with no catching or abnormal noises.
(Cancellation of BTL mute)
+ : Optical pick-up moves to the outer circumference
= : Optical pick-up moves to the inner circumference
= : Optical pick-up moves to the inner circumference
• Focus Search Check
1. Press
1. Press
^ button. (Focus search operation is performed continu-
ously.)
2. Look at the Optical pick-up objective lens and confirm that it
moves up and down smoothly, with no catching or abnormal
noises.
noises.
3. Press
p button.
Confirm that focus search operation stops. If it does not , press
p button again longer.
p button again longer.
Note :
When the malfunction is occurred by mis-passing
other buttons, turn off the power and check again
from making the test mode.
other buttons, turn off the power and check again
from making the test mode.
How to put the Set into Test Mode
1. Short-circuit between JW804 and JW812 on the switch board.
2. Turn the POWER ON.
3. Open the Short-circuit.
2. Turn the POWER ON.
3. Open the Short-circuit.
[SWITCH BOARD] (Conductor side)
How to Release Test Mode
1. Turn the POWER OFF.
E-F Balance Adjustment
This adjustment is to be done when the optical pick-up block is
replaced.
replaced.
Adjustment Procedure :
1. Connect the oscilloscope between TP (VC) and TP (TO) on CD
1. Connect the oscilloscope between TP (VC) and TP (TO) on CD
board.
2. Put the set into test mode.
3. optical pick-up setting to the center by
3. optical pick-up setting to the center by
+ or = button
pushing.
4. Insert disc (YEDS-18) and press
^ button.
5. Adjust RV703 so that the oscilloscope traveres waveform is sym-
metrical, as shown in the figure below.
6. Release test mode after adjustment is completed.
[CD BOARD] (Conductor side)
Adjustment Location : CD board (See page 12)
Focus Bias Adjustment
This adjustment is to be done when the optical pick-up block is
replaced.
replaced.
Adjustment procedure :
1. Connect the oscilloscope to test point TP (VC) and TP (RFO) on
1. Connect the oscilloscope to test point TP (VC) and TP (RFO) on
CD board.
2. Put the set into test mode.
3. Optical pick-up setting to the center by
3. Optical pick-up setting to the center by
+ or = button
pushing.
4. Insert disc (YEDS-18) and press
^ button.
5. Press the
^ button. (Tracking servo ON)
A
0V
B
C
VOLT / DIV : 1V
TIME / DIV :1ms
TIME / DIV :1ms
A = B
C = 350mV
±
120mV
IC701
TP (VC)
TP (TO)
+
-
TP (TO)
oscilloscope
(DC range)
TP (VC)
TP
(TEST 1)
JW804
JW812
JW812
TEST Portion
Short : Test mode
Open : Normal mode
Short : Test mode
Open : Normal mode
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