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