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4. PICKUP INCLINATION ADJUSTMENT/FCS
ERROR BALANCE ADJUSTMENT
[Mechanical Adjustment]
® Purpose:
Adjustment of the pickup inclination to direct the laser beam vertically with respect to the disc.
@ Symptom when incorrectly adjusted : There is crosstalk.
Measurement equipment
Measurement equipment
& jigs
connecting points
®@ Test disc (GGV1003)
® Oscilloscope
@ TV monitor
® Oscilloscope
CN301-2 (RF)
@ TV monitor
Player's
video
output
terminal.
Player condition
Adjusting points
®@ Test mode
+ #2701 still
(Black screen)
« TRK servo closed
* Tilt servo OFF
@ Pickup Ass'y
TRK/Tangential
direc-
tion
Inclination
adjust-
ment screw
@ VR605 (TE BEST)
@ VR606 (CT BEST)
Adjusting procedure
1. Connect CN301-2 to the oscilloscope.
2. Search for #2701 and look at the RF waveform.
3. Adjust
the
pickup's
TRK/tangential
direction
inclination
adjustment
screw
to maximize
the wave-
form's amplitude.
4, Look
at the TV
screen
and make
sure
there is no
crosstalk.
Note:
If there is crosstalk on the TV screen even when the
RF level is at the maximum, do next steps as follows.
5. Connect CN301-9 to the oscilloscope.
6. Open
the
TRK
servo
loop
and
adjust
VR605
to
maximize the TRK waveform's amplitude.
Note:
With the TRK servo closed, set it to still. Then adjust
the jump pulse to the maximum level.
: 7. Close the TRK servo loop.
: 8. Connect CN301-2 to the oscilloscope.
: 9. Adjust
VR606
to
maximize
the
RF
waveform's
amplitude.
10. Watch #115 on the TV monitor and make sure there
is no crosstalk.
Note:
If there is noticeable crosstalk, watch
#115 on the
TV monitor and adjust VR606 until the crosstalk is
eliminated.
Adjustment diagram
Inclination adjustment screw
oq
Dcn301
Oscilloscope
13
for the TRK direction.
Inclination adjustment screw for
the tangential direction.
#115 Crosstalk minimum
®
|
—$so0mv
+50mVv
Set to maximum RF amplitude at #2701.
5. TILT SENSOR INCLINATION/TILT BALANCE ADJUSTMENT
[Mechanical Adjustment]
@ Symptom when incorrectly adjusted:
There is crosstalk.
Measurement equipment
Measurement equipment
& jigs
connecting points
Player condition
Adjusting points
@ TV monitor
Player's video output
@TV monitor
@ Test disc (GGV1003)
® Small Phillips screwdriver
terminal
@ Test mode
- #16200 still
* TRK servo closed
: Tilt servo OFF
® Tilt sensor inclination
adjustment screw
© VR607 (TILT BAL)
Adjusting procedure
1. Search for frame #16200 on the test disc.
2. Set VR607 to the mechanical center.
3. Adjust the tilt sensor inclination adjustment screw so
that the tilt error display code is 6, 7, or 8 on the TV
monitor or FL tube.
Note:
Turn
the tilt sensor
inclination
adjustment
screw
clockwise more than 1/4 turn from the best point. Then turn
the
screw
counterclockwise
1/4
turn
to
complete
the
adjustment.
4. Search for frame #115.
5. Adjust VR607 so that the tilt error display becomes 7.
Note: Regarding the test mode, see page 4.
Adjustment diagram
MOTHER BOARD ASSEMBLY
Tilt sensor inclination
adjustment screw
14
Tilt error indication
PDBOI2
TV screen display
Note:
This display indicates the tilt error
display's location.
Other displays may
differ slightly from the actual.
RANDOM
aU
COV
PROGRAM
rx]
REMAIN
TL PAUSE
i/o
P PLAY
ara
DIGITAL
SOUND
REPEAT
Tilt error display
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