JVC KD-AV7005 Service Manual page 37

4.1.5 Adjustment method for jitter
After replacing the pickup, set the unit in the service mode to display a jitter value on the LCD. Confirm that the jitter value measured
with a jitter meter is within 12.0% of the jitter value displayed on the LCD. If it is within 12.0%, then adjustment is not necessary.
If the measured jitter value is outside the 12.0% tolerance range, perform the following adjustments.
4.1.5.1 Adjustment procedure
(1) Connect each unit shown in Fig.1.
(2) Set the unit to the service mode and display a jitter value (hex data) on the LCD.
(3) Turn each of the screws a, b and c, by a half-turn per step, in the direction that reduces the jitter value in order to minimize it.
(Do not turn a screw more than a half turn at a time, but adjust the screws in the cycle of a → b → c → a.)
(4) After completing the adjustment, secure the screws with screw lock paint.
b
Jitter value adjustment procedure (Pickup horizontal level adjustment relative to the DVD recording surface)(For the adjustment tool
use a 3 mm wrench and not a screwdriver, this procedure will make the adjustment easier.)
c
a
3 mm wrench
(No.MA101)1-37