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PD-Ps20M
[How to play back a disc in test mode]
In test mode, since the servos operate independently, playing back a disc requires that you operate the keys in the
correct order to close the servos.
Here is the key operation sequence for playing back a disc in test mode.
PROGRAM
Lights up the laser diode and closes the focus servo.
AS
:
2
PLAY/PAUSEP
/ 10
gL
PLAY/PAUSE
/ 10
Closes the tracking servo.
(Press the "> /(0" key twice.)
Starts the spindle motor and closes the spindle servo.
Wait at least 2-3 seconds between each of these operations.
1. Focus Offset Adjustment
@ Objective
Sets the DC offset for the focus error amp.
@ Symptom when out of | The model does not focus in and the RF signal is dirty.
adjustment
@ Measurement instru-
Connect the oscilloscope to
@ Player state
Test mode, stopped
ment connections
TPI, Pin
6(FCS. ERR)
(just the Power switch on)
[Settings] SmV/division
|°A@¥Stment location | VR103 (FCS. OFS)
|
10 ms/division
[Procedure]
Adjust VR103 (FCS. OFS) so that the DC voltage at TP1, Pin 6 (FCS. ERR) is — 150 + 50 mV.
33
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