Pioneer MJ-L5 Service Manual page 53

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3 Grating Adjustment
Step No. Operation Keys and Operation Method
1 Short circuit MECH TEST MODE during the power
ON, or press the ESC key.
(Service remote control unit)(Fig.1)
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
TE
L 13942296513
REFO
4 Preliminary Adjustment
Step No. Operation Keys and Operation Method
1 Short circuit MECH TEST MODE during the power
ON, or press the ESC key.
(Service remote control unit)(Fig.1)
2 Insert the test disc GGF1328 (MMD-212).
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3 Press the ASES key (until RST YOBI is displayed).
4 Press the PLAY key.
.
5 Press the ASES key several times and display
the GTG (GROOV TRACKING GAIN) value.
6 Use the F.SKIP key (UP) and the R.SKIP key (DOWN)
to adjust the value of
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Ocsilloscope
100kΩ
470p
470p
100kΩ
EOUT
FOUT
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2 9
8
FL Display
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
SIDE A
MD CORE MAIN UNIT Q Q
3 6 7 1 3 1 5
FL Display
EJECT Test mode
LOADING
GRT AJST
RST YOBI
Preliminary adjustment result display co
mode
.
GTG :
GTG : 4
MJ-L5, SP-L5
9 4 2 8
Status
a
b
Lissajous waveform
a:b = Within 3:1
0 5 8 2 9 9 4 2 8
Adjustment
Screw A
Adjustment
Point
Status
m
9 9
Remarks
9 9
Hole
Remarks
53