Pioneer DVR-A03 Service Manual page 48

DVR-A03
QQ
3 7 63 1515 0
6.2.3 Radial Tilt Circuit Adjustment
Objective
To adjust the target value of tilt servo so that pickup and disc become to be level relatively.
Symptom when out of
Playback RF waveform is dirty (Playback jitter is defective).
adjustment
Measurement Instru- Connect the total T-jitter meter to TP125
ment connections (RF) terminal.
Adjustment standard Playback jitter is minimum.
value
[Procedure]
"3TL" (Initialize the tilt)
4TL
• Enters code " " in the state that does not clamp a disc.
• Calmp the unrecorded DVD-RW disc and enters code "
• Calmp the DVD-ROM (Dual) disc and enters code "
• Calmp the DVD-ROM (Single) disc.
"3DT" (Selects DVD-ROM (Single) mode)
"1XN" (Set the CLV normal speed)
TE
L 13942296513
"+100000+PL" (Search for address 100000h)
• Monitor the pin 54 (AGCOUT) of IC112 (RF63). ("RF" is marked on the test land of the DVD ATAPI MAIN Assy.)
• Connect the jitter meter to TP125 (RF), search for a point where the jitter of both total-T edges become minimum with
"2TL" (Tilt Down)
. At this time, turn the equalizer of jitter meter to OFF.
"7TL" (Obtain the TILT TARGET)
"RJ" (REJECT)
• Clamp the recorded CD-R disc.
"1DT" (Selects CD-R mode)
"4XN" (Set the CLV 4th speed)
"+200000+PL" (Search for 20 minutes)
• Monitor the pin 54 (AGCOUT) of IC112 (RF63). ("RF" is marked on the test land of the DVD ATAPI MAIN Assy.)
• Connect the jitter meter to TP125 (RF), search for a point where the jitter of both total-T edges become minimum with
"2TL" (Tilt Down)
. At this time, turn the equalizer of jitter meter to OFF.
"7TL" (Obtain the TILT TARGET)
"RJ" (REJECT)
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6TL
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Player state PLAY, Tilt servo ON
Adjustment location Set the tilt error value with the command
input.
Disc DVD-ROM(Dual)/ DVD-ROM(Single)/
Unrecorded DVD-RW/ Recorded CD-R
discs.
".
Q Q
3 6 7 1 3
.
9 4 2 8
1 5 0 5 8 2 9 9 4
"1TL" (Tilt UP)
"1TL" (Tilt UP)
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9 9
2 8 9 9
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