Pioneer MJ-D508 Service Manual page 44

MJ-D508
3
Grating Adjustment
Step No. Operation Keys and Operation Method
1 Power ON while holding the ENTER key and the PLAY
key depressed.
2 Insert the test disc GGF1328 (MMD-212).
3 Press the PLAY key.
4 Connect an oscilloscope according to the following
connection diagram and loosen the screw A at the side
of the adjustment hole. Turn the hole with a screwdriver
until the Lissajous waveform becomes as shown in the
figure, and then tighten the screw A.
5 Press the STOP key.
Connection Diagram
EOUT
REFO
4
Preliminary Adjustment
Step No. Operation Keys and Operation Method
1 Power ON while holding the ENTER key and the PLAY
key depressed.
2 Insert the test disc GGF1328 (MMD-212).
3 Press the A-B key (until AUT YOBI is displayed).
4 Preliminary adjustment starts when the PLAY key is
pressed.
44
FL Display
EJECT
LOADING
GRT AJST
LON :
LAg :
GEG :
GRT AJST
Ocsilloscope
100kΩ
470p
470p
100kΩ
CORE MAIN UNIT ASSY
FOUT
FL Display
EJECT
LOADING
GRT AJST
AUT YOBI
HAo :
RFg :
PTG :
Can't ADJ.
COMPLETE
Status
Test mode
Grating adjustment status
Playback is started in tracking open
status. (The servo is closed only for
focus and spindle.)
Lissajous waveform a:b = Within 3:1
Adjustment end
a
b
Lissajous waveform
a:b = Within 3:1
SIDE A
Screw A
Status
Test mode
Preliminary adjustment mode
|
Defective adjustment
(problem with the servo system)
Adjustment end
Remarks
Adjustment
Hole
Adjustment
Point
Remarks