Read Sony CFD-S27 (serv.man2) Service Manual online
– 9 –
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.
Repair if there are any problems.
• Sled Motor Check
1. Press
1. Press
fl 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
fl 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
π button.
Confirm that focus search operation stops. If it does not , press
π button again longer.
π 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.
from making the test mode.
How to put the Set into Test Mode
1. Make sure the POWER switch (S801) is off and then turn on the
power. (The LCD801 all light up.)
2. Set Test Mode by momentarily shorting both of the test mode
terminals with a jumper. (Shorting the terminals momentarily is
sufficient).
sufficient).
[SW BOARD]
How to Release Test Mode
1. Press the FUNCTION switch (S809).
2. Turn the POWER OFF.
2. 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 to test point TP (VC) and TP (TO) on
1. Connect the oscilloscope to test point TP (VC) and TP (TO) on
MAIN 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
fl 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.
[MAIN BOARD]
Adjustment Location : Main board (See page 12)
A
0V
B
C
VOLT / DIV : 1V
TIME / DIV :1ms
TIME / DIV :1ms
A = B
C = 180 – 420mV
TEST mode
Open : Normal mode
Short : Test mode
Short : Test mode
Jamper wire
TP (TO)
oscilloscope
(DC range)
TP (VC)
Click on the first or last page to see other CFD-S27 (serv.man2) service manuals if exist.