Read Sony DCR-DVD305 (serv.man3) Service Manual online
6-68
DCR-DVD305
2-8-2.
Diagnosis
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)
-R Seek
Purpose
Check the seek performance
when DVD-R disc is used
(Seek between 2 points) x 6 x 2
patterns = Total time
when DVD-R disc is used
(Seek between 2 points) x 6 x 2
patterns = Total time
Trouble Symptom
Cause
MD block
VC board
VC board
Repair
Replace and readjust
Replace and readjust
Replace and readjust
-R Read
Purpose
Check the read performance
when DVD-R disc is used
RF Jitter (DSP Jitter), BLER,
LPP Error
when DVD-R disc is used
RF Jitter (DSP Jitter), BLER,
LPP Error
Trouble Symptom
Cause
OP age-based change
VC board
VC board
Repair
Readjust
Readjust
Readjust
-R Write
Purpose
Check the write performance
when DVD-R disc is used
Wobble Jitter, RF Jitter (DSP
Jitter), BLER
when DVD-R disc is used
Wobble Jitter, RF Jitter (DSP
Jitter), BLER
Trouble Symptom
Cause
OP age-based change, Faulty
mechanism
mechanism
Repair
Readjust
Jitter NG
Jitter NG
→
Replace MD
Jitter OK, Wobble NG
→
Readjust
→
NG
→
Replace MD
-RW Seek
Purpose
Check the seek performance
when DVD-RW disc is used
(Seek between 2 points) x 6 x 2
patterns = Total time
when DVD-RW disc is used
(Seek between 2 points) x 6 x 2
patterns = Total time
Trouble Symptom
Cause
Repair
-RW Read
Purpose
Check the read performance
when DVD-RW disc is used
RF Jitter (DSP Jitter), BLER,
LPP Error
when DVD-RW disc is used
RF Jitter (DSP Jitter), BLER,
LPP Error
Trouble Symptom
Cause
Repair
-RW Write
Purpose
Check the write performance
when DVD-RW disc is used
Wobble Jitter, RF Jitter (DSP
Jitter), BLER
when DVD-RW disc is used
Wobble Jitter, RF Jitter (DSP
Jitter), BLER
Trouble Symptom
Cause
Repair
Sensor
Purpose
Check various sensors
(Dew sensor, Temperature
sensor, Shock sensor)
(Dew sensor, Temperature
sensor, Shock sensor)
Disc type check
Trouble Symptom
Cause
CPU port broken
Faulty sensor
Faulty sensor
Both mechanism and board
Repair
Replace the board
Temperature sensor
Temperature sensor
→
OP
Dew sensor
→
Connector
Shock sensor
→
DSP IC, Sen-
sor
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