Sony CFD-21 - VCO Adjustment; Notes on Adjustment; Before Adjustment

5-3. CD SECTION
Notes 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
indicated.
Before Adjustment
Put the set into test mode and perform the following checks.
Repair if there are any problems.
e@ Sled Motor Check
1. Press } Key, then press I key.
2. Press PPI, Kd keys and comfirm that the FOP moves smoothly
from the innermost to outermost circumference and back smoothly
and with no catching or abnormal noises. (Cancellation of BTL mute.)
>|: FOP moves to the outer circumference
kK: FOP moves to the inner ciecumference
e@ Focus Search Check
1. Press > key. (Focus search operation is performed continuously.)
2. Look at the FOP objective lens and confirm that it moves up and
down smoothly, with no catching or abnormal noises.
3. Press Ml key.
Confirm that focus search operation stops. If it does not, press ill key
again longer.
Note : When the malfunction is occured by mis-passing other keys, turn
off the power and check again from making the test mode.
How to Put the Set into Test Mode
1. Short-circuit follwing portion(TP706)on the CD MAIN board.
2. Turn the POWER on.
3. Release the short.
[CD MAIN BOARD] (conductor side)
short
(TP706)
VCO Adjustment
1. Short-circuit the TP704 (ASY) and GND on the CD MAIN board.
2. Connect the frequency counter to the TP705 (PLCK).
3. Adjust with RV704 so that the reading on the frequency
counter becomes 4.3218 MHz.
4. Release the short.
Adjustment Location: CD MAIN board (See page 15)
[CD MAIN BOARD]
(conductor side)
Short-circuit for
VCO Adjustment
VCO Adjustment
Frequency Counter