7.3.9. SUB CONTRAST ADJUSTMENT
Purpose:
To set the optimum sub contrast level.
Symptom of Misadjustment:
The picture is too dark or too light.
Test Point:
Pin 5 of P6001 (TV/VCR Main C.B.A.)
or TP49 (CRT C.B.A.)
Adjustment:
SUB CONTRAST (EVR)
Specification:
3.0 V[p-p]±0.1 V[p-p]
Input:
Video Input Jack, Crosshatch Pattern Signal 1 V[p-p] (75
terminated)
Mode:
STOP
Equipment:
Oscilloscope, NTSC Video Pattern Generator
1. Supply a Crosshatch Pattern Signal to the Video Input Jack.
2. Connect the Oscilloscope to Pin 5 of P6001 on the TV/VCR Main
C.B.A. or TP49 on the CRT C.B.A.
3. Select SUB BRIGHT in EVR adjustment mode. Then, after making
a note of the original value, adjust to the (D0).
4. Select SUB CONTRAST in EVR adjustment mode and adjust so
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