Advertisement
6. ADJUSTMENTS
@ Adjustment Methods
@ Adjustment Items/Verification Items and Order
If the specified values cannot be obtained or no adjustment is possible by performing the verifications or adjustments
described in steps 1 — 4, the pickup block may be defective.
Focus offset verification
TP1, Pin6(FCS. ERR)
Tracking error balance verification
TP1, Pin2(TRK. ERR)
TP1, Pin5(FCS. IN)
t
Focus servo loop gain adjustmen
TP1, Pin6(FCS. ERR)
VR152 (FCS. GAN)
Pee,
" |
TP1, Pin3(TRK. IN)
Vv
'
Tracking servo loop gain adjustment
TP1, Pin 2(TRK. ERR)
R151 (TRK. GAN)
;
@ Abbreviation table
FCS. ERR _ :Focus Error
TRK. ERR
:Tracking Error
FCS GAN _ :Focus Gain
TRK GAN:
Tracking Gain
FCS. IN
'Focus In
TRK.IN
_ :Tracking In
@ Measuring Instruments and Tools
1. Dual trace oscilloscope (10:1! probe)
. 2. Low-frequency oscillator
3. Test disc (YEDS-7)
4. Low pass filter (39k Q +0.001 uF )
5. Resistor (100 kQ2 )
6. Standard tools
31
Advertisement
