Ece6 - JVC KD-ADV6270J Service Manual

4.4 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% of the jitter value displayed on the LCD.
If it is within 12%, then adjustment is not necessary.
If the measured jitter value is outside the 12% tolerance range, perform the following adjustments.
4.4.1 Adjustment procedure
(1) Set the unit to the service mode and display a jitter value (hex data) on the LCD.
(2) 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 the same level is turned in the pair of
b+c and the same level is turned in the pair of a+b.)
(3) 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.)
(1) Set the unit to the service mode and display a jitter value (hex data) on the LCD.
(2) 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 screw in the cycle of same level turn by pair of b+c→ pair of
a+b.)
(3) After completing the adjustment, secure the screws with screw lock paint.
c
a
3 mm wrench
(No.MA250)1-25