Pioneer XR-A550MD Service Manual page 89

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6.4.2.3 Mechanism Adjustment
1. Detecting the Optical Pickup Grating
IC1101 Pin 42
GND (TP1131)
100kΩ
IC1101 Pin 26
EOUT (TP1133)
470p
470p
IC1101 Pin 25
FOUT (TP1132)
100kΩ
Fig.4 Measuring the Optical Pickup Grating Deviation
Using a high reflective MD disc, perform automatic adjustment in
the AUTO test mode (COMPLETE is displayed), and adjust the
EOUT: FOUT resurge waveform (x-y).
(1) Desolder the two points of the disc motor board, solder the lead
wire to the motor terminal and board temporarily as shown in
the figure, loosen the three screws of the motor slightly, and
while looking at the resurge waveform, adjust it.
(2) After adjusting, tighten the screws in the order of 1, 2, and 3.
2. Checking Jitter
TE
L 13942296513
After automatic adjustment in the AUTO Mode of Test Mode for
low-reflectance MD is completed, check the jitter with the pit
Continuous Play Mode and groove Continuous Play Mode.
5P Flat Cable
(GGD1182)
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.
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Oscilloscope
GND CH1 CH2
b
X Y
Resurge waveform
a : b = Within 3 : 1
CNP1252
CNP1601(Rear)
CNP1602
CNP1603
CNP1101
CNP1604(Rear)
x ao
MD MAIN ASSY
y
i
6P-2P Extension Connector
(GGD1181)
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8
Spindle Motor
a
Adjusting Hole
1
Q Q
IC1201 Pin1 (TP1274)
3 6 7 1 3
EFMMON
IC1201 Pin88 (TP1275)
2P Extension Connector
(GGD1108)
From Motor
To
MD MECHA
SWITCH ASSY
28P Flat Cable
(GGD1180)
Service Extension Board
u163
(GGF1320)
.
Fig.7 Connection
XR-A550MD
2 9 9 4 2 8
1
3
2
3
Spindle Motor
While changing the attaching
position by inserting a screw-
driver into the adjusting hole
of the disc motor, check the
resurge waveform.
Adjusting
2
Hole
Fig.5
Jitter Meter
1 5 0 5 8 2 9 9 4
GND
Fig.6
From Magnet Head
From
Optical Pickup
m
co
9 9
2 8 9 9
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