Adjustment - Yamaha DVD-C996 Service Manual

DVD-C996/DV-C6280

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
Main unit display
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.
STEP6
Check condition
NG
after adjustment
OK
STEP7
23
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
there is no picture
degradation in the inner,
middle and outer
peripheries, and no audio
skipping.
Mode
DVDT-S15 (AAX07320)
T1 (inner periphery) play
or
T2 (outer periphery) play
DVDT-S01 (TX946080)
Adjustment value
Adjust to the minimum jitter value.
(070 = 7% and 090 = 9% jitter.)
Tilt adjustment screw 1
Change in
jitter value
B A
• Jitter value depends on the model:
(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.
Disc
Tilt adjustment screw 2
Tangential adjustment screw
Optimum
point
Adjustment angle