Pioneer XC-IS21MD Service Manual page 60

XC-IS21MD
3 Grating Adjustment
Step No. Operation Keys and Operation Method
1 Short circuit MECH TEST MODE during the power
ON.
(Fig.6-1)
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
EOUT
REFO
4 Preliminary Adjustment
Step No. Operation Keys and Operation Method
1 Short circuit MECH TEST MODE during the power
ON.
(Fig.6-1)
2 Insert the test disc GGF1328 (MMD-212).
60
FL Display
EJECT
LOADING
GRT AJST
LON :
LAg :
GEG :
GRT AJST
Ocsilloscope
100kΩ
470p
470p
100kΩ
MD CORE MAIN UNIT
FOUT
FL Display
EJECT
LOADING
GRT AJST
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
Remarks
Adjustment
Hole
Adjustment
Point
Remarks