Adjustment - Yamaha DVD-C996 Service Manual

DVD-C996/DV-C6280
QQ
3 7 63 1515 0

ADJUSTMENT

Optical Pickup Tilt Adjustment
Measurement point
Main unit
service display
Measuring equipment, tools
Hex wrench (part number: TX946380), 1.2mm
Screw lock (part number: TX946400)
START
STEP1
Start with Power ON and in play.
" PAUSE" button: main unit
"PLAYXCHANGE" button: main unit
"5" button: remote control unit
STEP2
TE
Main unit display
L 13942296513
Check to see that "JIT xxx" is displayed.
Present jitter value.
STEP3
Play test disc title 1
(inner periphery)
Tangential adjustment screw
Adjust to the minimum jitter value.
STEP4
Play test disc title 43
(outer periphery)
Tilt adjustment screw 1
Adjust to the minimum jitter value.
STEP5
Play test disc title 43
(outer periphery)
Tilt adjustment screw 2
Adjust to the minimum jitter value.
www
STEP6
Check condition
NG
after adjustment
.
OK
STEP7
23
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Adjustment point
Tangential adjustment screw
Tilt adjustment screw
• Replaced the optical pickup.
• Replaced the spindle motor.
• Replaced the peripheral parts
of the optical pickup, etc.
Press
simultaneously
Do steps 3-5
from the bottom
of the main unit
using a hex wrench.
Repeat adjusting tilt
adjustment screws
1 and 2 alternately,
two or three times.
Play the disc to make sure
x ao
there is no picture
y
degradation in the inner,
middle and outer
i
peripheries, and no audio
skipping.
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8
Mode
T1 (inner periphery) play
T2 (outer periphery) play
Adjustment value
Adjust to the minimum jitter value.
(070 = 7% and 090 = 9% jitter.)
Tilt adjustment screw 1
Q Q
3 6 7 1 3
Change in
jitter value
B A
• Jitter value depends on the model:
u163
(1) If the jitter value changes like A,
the optimum point is easy to find
(2) If the jitter value changes like B,
.
set the optimum point near the middle.
2 9 9 4 2 8
Disc
DVDT-S15 (AAX07320)
or
DVDT-S01 (TX946080)
Tilt adjustment screw 2
Tangential adjustment screw
1 5 0 5 8 2 9 9 4
Optimum
point
Adjustment angle
m
co
9 9
2 8 9 9