Tracking Offset, Focus Offset And Rf Offset Adjustment; Rf Level Adjustment; Ld (Laser Diode) Output Power Confirmation; Focus Lock And Spindle Lock Confirmation - Pioneer CJ-V55 Service Manual

CJ-V55
Step
No.
Oscilloscope Setting
Test Points
Adjusting
Points
Check items/
Adjustment
specifications
Adjustment procedure
V | H
1
TRACKING OFFSET, FOCUS OFFSET AND RF OFFSET ADJUSTMENT
TP1
Pin 2
(TRK. ERR)
TP1
Pin 6 .
(FCS.ERR)
TP1
Pin 1
(RF
OUTPUT)
VR5
(TRK. BAL)
VR7
(TRK. OFS)
VR6
(FCS. OFS)
VR2
(RF. OFS)
Tracking offset
454
0V±50mV
FOCUS offset
0V±50mV
RF offset'
lOOmV ± 50mV
• Set to Service mode. .
• Turn VR5 TRK.BAL (Tracking balance) volume
clockwise 45° from the center.
• Adjust with VR7 TRK. OFS (Tracking offset) volume
so that the voltage of pin 2 TRK. ERR (Tracking
error) of TP1 becomes 0V ± 50mV.
• Adjust VR6 FCS. OFS (focus offset) so that the FCS.
ERR (focus error) voltage at TP 1 pin 6 becomes 0V
+ 50mV.
• Adjust VR2 RF. OFS (RF offset) so that the RF
output voltage at TP1 pin 1 becomes lOOmV ±50mV.
2
RF LEVEL ADJUSTMENT
TP1
Pin 1
(RF)
VR1
Laser power
i.5Vp-p:|$v
• Set to Service mode.
• Play TEST disc and connect probe of an oscilloscope
to pin 1 RF (RF output) of TP1 and measure the
P-P voltage of RF waveform.
• Adjust VR1 (Laser power) so that the value is within
1.5Vp-p !j$v.
3
LD (LASER DIODE) OUTPUT POWER CONFIRMATION
|
Confirmation :
less than 0.13mW
• Set to Service mode,
• Press 1— MULTI- SPEED -M kev + fOl and turn ON LD
(laser diode).
• Place sensor of the laser power meter immediately
above the object lens and confirm that the output
power of the LD is less than 0.13mW.
4 FOCUS LOCK AND SPINDLE LOCK CONFIRMATION
|
0.5V/div 100msec
/div
TP1
Pin 1
(RF output).
RF output exists
Normal rotation
• Set TEST disc.
• Set to Service mode.
• Shift the pickup close to the center of the disc by
Dressing the f-MULTI-SPEED+l kev + [4l.
* Note that this step must be performed.
• Observe pin 1 RF (RF output) of TP1 with an
oscilloscope and confirm that the RF signal is output
after Dressing the [-MULTI-SPEED+1 kev + 111.
• Press 1-MULTI-SPEED+1 kev + l2l and be sure that
the disc rotates in normal direction at almost the
specified spped (as it is close to the center of the
disc, the rotating speed is around 300 rpm) and not
rotates abnormally or inversely.
94