Pioneer PD-M423 Service Manual page 16

Multi-play compact disc player

Hide thumbs Also See for PD-M423:

PD-M423, PD-M403

@ Test Point and Adjustment Variable Resistor Positions

MOTHER BOARD ASSY

VR 151

TP!

TR.GA

(eo)

VR1521

CNI31

[ es

FO.GA](~__]

CN201

10151

Figure 1. Adjustment Locations

@ Notes

1. Use a 10:1 probe for the oscilloscope.

2. All the knob positions (settings) for the oscilloscope in the adjustment procedures are for when a 10:1 probe is

used.

@ Test Mode

These models have a test mode so that the adjustments and checks required for service can be carried out easily.

When these models are in test mode, the keys on the front panel work differently from normal. Adjustments and

checks canbe carried out by operating these keys with the correct procedure. For these models, all adjustments are

carried out in test mode.

[Setting these models to test mode]

How to set this model into test mode.

1. Unplug the power cord from the AC socket.

2. Short the test mode jumper wires. (See Figure 1.)

3. Plug the power cord back into the AC socket.

When the test mode is set correctly, the display is different from what it usually is when the power is turned on.

If the display is still the same as usual, test mode has not been set correctly, so repeat Steps 1 — 3.

Pd-m403