Pioneer PD-41 Service Manual page 23

PD-41, PD-93700
[Release from test mode]
Here is the procedure for releasing test mode :
1, Press the STOP key to stop all operations.
2. Turn off the power switch on the front panel.
[Operations of the keys in test mode]
Be careful. Pressing this key when there is no disc
mounted makes the spindle motor run at the maximum
speed.
If the focus servo does not go correctly into a closed
loop or the laser light shines on the mirror section at the
periphery edge of the disc, the same symptom is
occurred.