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4-3.
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 > button, then press Hi button.
2.
Press PPI, 44 buttons and confirm that the FOP moves
smoothly from the innermost to outermost circumference
and back smoothly and with no catching or abnormal
noises.
>i: FOP moves to the outer circumference
Kd: FOP moves to the inner circumference
e Focus Search Check
1.
Press > button.
(Focus search operation is performed
continuously.)
2.
Look at the FOP objective lens and confirm the it moves
up and down smoothly, with no catching or abnormal
noises.
3.
Press if button.
Confirm that focus search operation stops. If it does not,
press I button again longer.
How to Put the Set into Test Mode
1.
Short the following portion on the CD CONTROL board.
2.
Turn the FUNCTION
selector to CD position.
{CD CONTROL BOARD]
04
Traverse Adjustment
This adjustment is to be done when the optical pick-up block
is replaced.
Procedure:
oscilloscope
(DC range)
T(E)
OO
CD main board es (VREF)
| es
1.
Put the set into test mode.
2.
Connect
the oscilloscope
between
TP
(TE) and
TP
(VREF).
3.
Press the »Pl and K€ buttons to move the FOP to the
center.
4.
Insert disc (YEDS-18) and press > button.
Adjust RV701 so that the oscilloscope traverse waveform
is symmetrical, as shown in the figure below.
6.
Release test mode after adjustment is completed.
VOLT/DIV: 1V
TIME/DIV: 1mS
Adjustment value: 1.7+0.8Vp-p (A+B)
Adjustment Location : CD main board (See page 11.)
Short the jumper wire.
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