Pioneer MJ-D707 Service Manual page 44

MJ-D707, MJ-17D
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 REC MODE key (until RST YOBI is displayed).
4 Press the PLAY key.
5 Press the REC MODE key several times and display
the GTG (GROOV TRACKING GAIN) value.
6 Use the TIME SKIP key (UP) and the A-B key (DOWN)
to adjust the value of
44
Ocsilloscope
100k
470p
470p
100k
CORE MAIN UNIT ASSY
FOUT
to 4 or more.
FL Display Status
EJECT Test mode
LOADING
GRT AJST Grating adjustment status
LON : Playback is started in tracking open
LAg : status. (The servo is closed only for
GEG : focus and spindle.)
GRT AJST Lissajous waveform a:b = Within 3:1
Adjustment end
b
Lissajous waveform
a:b = Within 3:1
SIDE A
Screw A
FL Display Status
EJECT Test mode
LOADING
GRT AJST
RST YOBI
Preliminary adjustment result display
mode
GTG :
GTG : 4
Remarks
a
Adjustment
Hole
Adjustment
Point
Remarks