Vco Adjustment - Sony CFD-50 Service Manual

5-3. CD SECTION
How to Put the Set into Service Mode
Notes on Adjustment
1. Perform adjustment in service mode.
After adjustment, be sure to release service mode.
2. Perform adjustments in the order given.
3. Use the disc (YEDS-18, Part No. 3-702-101-01) only when so
indicated.
1. Short-circuit following portions on the CD main board.
2. Tune the POWER on.
CD main board (conductor side)
: short-circuit
Before Adjustment
Put the set into service mode and perform the following checks. Repair if
there are any problems.
Le eS [ee |
e Sled Motor Check
1. Press ® key, then press I key.
Press PPI, Kd keys and confirm that the FOP moves smoothly
from the innermost to outermost circumference and back smoothly
and with no catching or abnormal noises.
pb] : FOP moves to the outer circumference
K4q : FOP moves to the inner circumference
@ Focus Search Check
Press > key. (Focus search operation is performed continuously.)
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 Il key
again longer.
N=
VCO Adjustment
Adjustment Procedure:
1.. Short-circuit @ portion CD main board.
2. Adjust with RV703 so that the reading on frequency counter
becomes 4.3218 MHz.
3. Release the short-circuit @ portion.
Adjustment Location: CD main board (conductor side)
frequency counter