MJ-D707, MJ-17D
44
Screw
A
Adjustment
Hole
Ocsilloscope
b
a
470p
470p
100k
Ω
100k
Ω
CORE MAIN UNIT ASSY
SIDE A
REFO
EOUT
FOUT
Lissajous waveform
a:b = Within 3:1
Step No.
Operation Keys and Operation Method
FL Display
Status
Remarks
1
Power ON while holding the ENTER key and the PLAY
EJECT
Test mode
key depressed.
2
Insert the test disc GGF1328 (MMD-212).
LOADING
GRT AJST
Grating adjustment status
3
Press the PLAY key.
LON :
Playback is started in tracking open
LAg :
status. (The servo is closed only for
GEG :
focus and spindle.)
4
Connect an oscilloscope according to the following
GRT AJST
Lissajous waveform a:b = Within 3:1
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.
Adjustment end
3
Grating Adjustment
Connection Diagram
Adjustment
Point
Step No.
Operation Keys and Operation Method
FL Display
Status
Remarks
1
Power ON while holding the ENTER key and the PLAY
EJECT
Test mode
key depressed.
2
Insert the test disc GGF1328 (MMD-212).
LOADING
GRT AJST
3
Press the REC MODE key (until RST YOBI is displayed).
RST YOBI
4
Press the PLAY key.
Preliminary adjustment result display
mode
5
Press the REC MODE key several times and display
GTG :
the GTG (GROOV TRACKING GAIN) value.
6
Use the TIME SKIP key (UP) and the A-B key (DOWN)
GTG : 4
to adjust the value of to 4 or more.
4
Preliminary Adjustment