Electrical Adjustments - Pioneer CJ-V55 Service Manual

CJ-V55
7.2 ELECTRICAL ADJUSTMENTS
The adjustment items of this model should be
performed in the order as shown below.
• Adjustment and check Items
1. Tracking offset focus offset and RF offset
adjustmens
2. RF level adjustment
3. LD (Laser Diode) output power confirmation
4. Focus lock and spindle lock confirmation
5. Grating adjustment
6. Tracking balance adjustment
7. Tangential adjustment
8. Focus gain adjustment
9. Tracking gain adjustment
10. VCO free-run frequency adjustment
11. Method to confirm S character (FOCUS ERROR)
• Measuring Equipment
1. Dual trace oscilloscope
2. Laser power meter
3. Test disc (YEDS-7)
4. Tracking balance adjustment filter
5. Loop gain adjustment filter
6. Signal generator
7. Frequency counter
8. Other general tools
9. Remote control unit (RU-V101)
• Service Mode
The CD main unit can be operated independently
when remote control unit (RU-V101) is connected
to the unit
For the operation, refer to Service manual (1)
(ARP1912) : Service Mode (page 14).
Note:Before operating the remote control unit (RU-
V101), move the mechanism by using a lOkeys
+ STILL/STEP !!► (DISC SELECT) key to the
position where the test disc has been placed.
• Adjustment VRs and their names
VR1 : Laser power
VR2 : RF offset (RF. OF$)
VR3 : Focus gain (FCS. GAN)
VR4 : Tracking gain (TRK. GAN)
VRS : Tracking balance (TRK. BAL)
VRS : Focus offset (FCS. OFS)
VR7 : Tracking offset (TRK. OFS)
VR8 : VCO adjustment (VCO. ADJ)
DEGT
FREC
Fig. 7-6 Adjusting point
93