Pioneer BDP-170 Service Manual page 9

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3. [8] PDXY Check
For PDXY Check, the misalignment of pick-up optical axis can be checked.
The optical axis misalignments of X-axis and Y-axis are displayed "PDX" and "PDY" with %, respectively.
All of CD, DVD, and BD can be measured.
The method for calculating PDX and PDY is shown below.
PDX = ((A+B)-(C+D)) / (A+B+C+D)
PDY = ((A+D)-(B+C)) / (A+B+C+D)
[ Instructions ]
1 Insert a disc (BD, DVD, CD) in a nomal mode. If the playback starts, pause it.
Display the home menu and enter into the Service Mode.
In this mode, the measurement can be carried out at an arbitrary place. After a disc is inserted, play and stop the
point you want to measure, and then enter into the Service Mode.
(The pickup position does not return even in this status. The measurement at the place is available.)
2 Select "[8] PDXY Check" with the b button from the Service Mode screen, and press the [ENTER] button.
3 After the measurement is started and completed, the measurement value is displayed. If the value is within the
reference value, "Pass" is displayed.
4 Quit Service mode by pressing the [STOP] button. (The home menu screen will be displayed.)
Note:
If you open the tray in this state then attempt to play a disc, the "Close" indication is displayed on the FL display and
playback will not start. To correct such a situation, turn the unit OFF then back ON again.
[Effective indications]
Defect related to playback (block noise, sound jumping, image jumping, disc is paused, freeze of screen etc.)
If an NG is generated in a specific disc only, the defect is likely to be caused by the disc. If an NG is generated in other
discs too, the defect is likely to be caused by the pickup part. If the measurement value is very close to 40% even if an NG
is not generated, the NG is likely to be caused by the disc.
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