Cd Section - Sony PMC-107 Service Manual

CD SECTION

Notes on Adjustment
1. Perform Traverse 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.
4. Short the both sides of R714 on the CD board for stop operation
of anti-shock circuit. (See page 19.)
• Switch position
FUNCTION switch : CD
• In case of Test Mode
1. Short the solder bridge the TP801 (TEST) on the key board.
2. Insert the AC power plug.
• Release the Test Mode
Release the shorted solder bridge the TP801 (TEST), the test mode
is release.
–key board (conductor side) –
TP801
(TEST)
– 16 –
Before Adjustment
Put the set into test mode and perform the following checks. Repair
if there are any problems.
• Sled Motor Check
Press the ± , ≠
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.
±
: Optical pick-up moves to the outer circumference
≠
: Optical pick-up moves to the inner circumference
• Focus Search Check
1. Push the fl button. (Focus search operation is performed
continuously.)
2. Look at the optical pick-up objective lens and confirm the it moves
up and down smoothly, with no catching or abnormal noises.
3. Push the π button.
Confirm that focus search operation stops. If it does not, push the
π button again longer.
Traverse Adjustment
This adjustment is to be done when the optical pick-up block is
replaced.
Procedure:
CD board
TP (TE)
TP (VC)
1. Connect the oscilloscope between TP (TE) and TP (VC).
2. Put the set into test mode.
3. Push the CD lid to open and insert disc (YEDS-18).
4. Close the CD lid.
5. Press the ± and ≠
buttons to move the optical pick-up to
the center.
6. Push the fl button.
7. Push the π button.
8. Push the fl button.
9. Adjust RV702 so that the oscilloscope traverse waveform is
symmetrical, as shown in the figure below.
10. Release test mode after adjustment is completed.
Adjustment Location : See page 19.
oscilloscope
(DC range)
A
0V A=B
B