Read Sony DCR-DVD305 (serv.man3) Service Manual online
6-73
DCR-DVD305
2-8-5.
DVD-RW Adjust
Terms
FE: Focus Error
FE: Focus Error
TE: Tracking Error
PD: Photo Detector
BLER: Block Error Rate
Wobble: Meander of a guide groove made in a disc in advance. The address information, etc. can be obtained by the wobble.
DPP: Differential Push Pull (A method for detecting the TE)
DPP: Differential Push Pull (A method for detecting the TE)
OP Sensitivity
Purpose
Adjust the gain of main beam
to correct the dispersion in OP
sensitivity
to correct the dispersion in OP
sensitivity
Trouble Symptom
Cause
OP
RF IC
RF IC
Repair
Replace MD block
Replace IC
Replace IC
Offset Adjust
Purpose
Cancel the FE/TE offset that
occurs in OP, RF amplifiers
occurs in OP, RF amplifiers
Trouble Symptom
Cause
RF IC
OP
OP
Repair
Replace IC
Replace MD block
Replace MD block
FE Balance
Purpose
Adjust the gain balance between
+ side and - side of PD Focus
Error
+ side and - side of PD Focus
Error
Trouble Symptom
Cause
OP
RF IC
RF IC
Repair
Replace MD block
Replace IC
Replace IC
Write FE Balance
Purpose
Adjust to the FE balanced value
that minimizes the wobble jitter
that minimizes the wobble jitter
Trouble Symptom
Cause
OP
RF IC
RF IC
Repair
Replace MD block
Replace IC
Replace IC
Servo Adjust
Purpose
Adjust DPP balance, TE
balance, FE gain, and TE gain
balance, FE gain, and TE gain
Trouble Symptom
Cause
OP
RF IC
RF IC
Repair
Replace MD block
Replace IC
Replace IC
Disc Distinction Threshold
Purpose
Adjust the threshold to
distinguish a disc
distinguish a disc
Trouble Symptom
OK at all time
Cause
Repair
Write Offset
Purpose
Cancel the FE, TE offset of
write power
write power
Trouble Symptom
OK at all times
Cause
Repair
Jitter & BLER
Purpose
Measure DVD-RW self
recording jitter and BLER
recording jitter and BLER
Trouble Symptom
Cause
OP
RF IC
RF IC
Repair
Replace MD block
Replace IC
Replace IC
Click on the first or last page to see other DCR-DVD305 (serv.man3) service manuals if exist.