Pioneer PD-M630 Service Manual page 19

Multi- play compact disc player

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PD-M630

9. MSB adjustment

® Objective

To optimize the MSB adjustment when the D/A converter has been replaced.

e Symptoms when the

: Increased distortion in playback signals

MSB is out of adjust-

ment

@ Measurement instru-

Connect

the oscilloscope

to the! © Player state

Normal mode, play

ment connections

: audio output pin (pin out).

| [Settings]

10 mV/division

0.2 ms/division

: VR411 (MSB, right channel)

DC mode

_ YEDS-7

[Procedure]

. Play back Track No. 19 (1 kHz, -20 dB).

. Using the remote controller that comes with the PD-M630, set the attenuation on the display to -21 dB.

. Adjust VR412 (MSB left channel) and VR411 (MSB right channel) so that the bottom tip of the playback wave is

a smooth sine curve with no distortion.

[How to set the attenuator if there is no remote controller]

The attenuation can be controlled by shorting the leads for IC701 of the function board ass'y.

[Precaution]

When carrying out this operation, short Points A, B, and C shows in Figure 15. (See Page 32.)