JVC HR-XVC30US Service Manual page 24

4.4.7.2 Preparation for adjustment
(1) Remove the DVD unit.(Refer to the SECTION 3 Removing the major parts)
(2) Connect a extention cord between
Fig.4-4a)
(3) Connect a extention cord between
Fig.4-4a)
(4) Remove the DVD servo control board assembly attached the DVD unit.
(5) Three stud is attached in a DVD unit. (See Fig.4-4b)
NOTE:
The connector of an extended code (right or reverse) since direction of which is also connectable, be careful of the direction which a
relay wire inserts enough It will become the cause of failure if especially a Regulator board side is mistaken.
CN502
Main board
assembly
CN7301
Fig.4-4a
4.4.7.3 Adjustment
(1) Set the main body at test mode.
(2) Press the "SET UP MENU" key of the remote controller three times, and the FDP is displayed "CHECK".
(3) Insert a test disc (VT-501), and press the "PLAY" button of the front panel.
(4) After a few seconds, press the numeric key "6" of the remote controller. Then, the FDP is displays a jitter value.
(5) Turn the adjustment screws on the underside of the traverse mechanism with screw driver until the maximum jitter value is dis-
played on the FDP. (In this model, a bigger jitter value means a better result.)
NOTE:
• Reference values to judge whether the jitter is allowable or not are displayed, instead of actual jitter values.
• Please be sure to perform "all-initialization" and "optimization adjustment of front end parameter" after adjusting.
Screw a
Screw b
FDP (Example)
1-24 (No.YD001)
CN502 of DVD servo control board assembly and
CN501 of DVD servo control board assembly and
DVD unit
DVD servo
control board
CN501
assembly
Regulator board
CN7302
assembly
1241
Remote controller "6" key-Jitter value
****
CN7301
CN5302
Stud
Loading mechanism assembly
Traverse mechanism assembly
POINT:
Turn the adjustment screws a and b
to the same angle in the right direction.
And turn the adjustment screws a and b
Screw c
to the same angle in the left direction.
Then, turn the screws a and b in either
the right or the left direction to increase
the number of jitter.
Don't turn the adjustment screw c.
of Main board assembly. (See
of Regulator board assembly. (See
Fig.4-4b