Pioneer DRM-6NX Service Manual page 39

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6.2.3 CHECK AND ADJUSTMENT
1. Focus Offset Check
PLAY MODE
TEST DISC
START
TE
L 13942296513
MAIN BOARD ASSY
2. Tracking Error Barance Check
Test mode 1
SPDL servo
FOCUS servo = CLOSE
TRKG servo
TEST DISC
START
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MAIN BOARD ASSY
.
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Focus Error Offset
Tracking Error Offset
Auto Adjustment
PLAY
VREF
FE
GND
= CLOSE
= OPEN
R=35mm
PLAY
CD-ROM Player
TE
VREF
x ao
y
i
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8
and
CD-ROM Player
Prove(10:1)
GND
Prove(10:1)
GND
Q Q
3 6 7 1 3
A
C
B
Check
When there is a DC
component
Prove(10:1)
u163
GND
.
2 9 9 4 2 8
VREF
(CH1)
GND
FCS.ERR
(CH2)
GND
Oscilloscope
DC Mode
V: 1 V/div
H: 10 mSec/div
1 5 0 5 8 2 9 9 4
A=B
A≠B
A
VREF
B
When there is no DC
component
Oscilloscope
DC Mode
V: 500 mV/div
H: 5 mSec/div
m
co
DRM-6NX
9 9
6.2 ADJUSTMENT
A
B
2 8 9 9
VREF
39