Pioneer CLD-980 Service Manual page 66

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14, 1H Delay Video Level Adjustment

[Electrical Adjustment]

® Purpose:

Equalization of the video levels of the 1 H delay video signal and the main line video signal.

@ Symptom when incorrectly adjusted : If the 1 H delay video signal level is high, white dropout will be noticeable and

there will be H shifting. (Horizontal stripes across the screen.)

If the 1 H delay video signal level is low, biack dropout wiil be noticeable.

pin 42 and GND.

CH 2: Pin 40 of IC401.

1. Search for frame #3800 on the test disc.

2. Adjust VR441 so that the 1 H delay video level (CH 1)

becomes the same as the main line video level (CH 2).

(See Photo 1.)

Note:

The video level is the level between the SYNC tip and

the white peak.

Adjusting procedure

Adjustment diagram

Oscilloscope range. AC

CH1: 20mV/div

10uS /div

CH2: 20mV /div

Main video signal