Denon DCD-315 - Page 17

3. Judgement by checking of changing PU due to
(check for proper Traverse waveform)
Actuate the service program.
(service mode)
Load the adjustment disc.
(CA-1094) (Note 1)
Press[PLAY]button, and
display Be.
(focus search only ON)
Observe with oscilloscope
across test point TE and VC.
Measure tracking error
signal.
No
ls VTEmax shown
more than 0.64V?
Yes
Is VTE signal
continuously
shown?
Yes
Perform checking item 4.
(Next page)
Note 1: Adjustment disc (CO-76143) VTE = 0.70 V.
Is PU lens cleaned?
DCcD-315 laa”
Tracking Error Signal VTE
1. Tracking error signal level without undulation.
Traverse waveform
[0.5V
/
div]
Haif
turn
of
disc
pool AT
Thin Thick Thin[2msec/div]
VTE
2. Tracking error signal level with undulation.
UML
A
3. Occasionally no tracking error signal level.
atl Maal MMA
aa TN Aa
Thin Thick Thin [2msec/div]
[0.5V / div]
Vie
(2msec/div])
[Defective PU]
GND VTE
No
Clean the PU lens.
Trouble may exist in PU
abnormality due to VTE.
Execute PU replacement.
17