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To improve the Playback Chroma S/N.
Symptom of Misadjustment:
Playback interchangeability is inadequate.
Test Point:
TP3004 (Main C.B.A.)
Adjustment:
R3204, R3205 (Main C.B.A.)
Specification:
Less than 50 mV[p-p]
Input:
Video Input Jack
NTSC Color Bar (W/WHITE WINDOW)
Mode:
SP self recording and playback
Equipment:
Oscilloscope,
NTSC Video Pattern Generator,
Blank Tape
1. Supply NTSC Color Bar Signal to the Video Input Jack and make a
recording in SP mode.
2. Playback the recording and adjust R3204 (CNR PHASE) and R3205
(CNR GAIN) alternately so that the Chroma Signal at TP3004 is at
minimum.
3. Make sure that the Chroma Signal at TP3004 is less than 50 mV[p-
p].
Fig. E3-1 (before adjustment)
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