Service manual

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STEREO SEPARATION Adjustment
Input signal: Stereo test signal from audio generators-1 and -2
Input level: 60 dBµ, P/S 7 dB
Channel: 11 CH (fp = 199.25 MHz)
Video: Color bars (1 Vp-p, modulation degree 87.5%)
Audio: 400 Hz±25 kHz deviation
Setting the audio generator-1
L-CH only
300 Hz, ±7.5 kHz deviation
STEREO, NR: ON
Setting the audio generator-2
L-CH only
3 kHz, ±7.5 kHz deviation
PRE-EMP: ON
Other setups are the same as those of audio generator-1.
Measuring equipment:Pattern generator, NTSC US MPX, VTVM
Test point: IC701 pin-1
Adjustment point: Adjustment menu PAGE 5-2 (WIDEBAND), 5-3 (SPECTRAL)
Adjustment method:
1. Establish the "Setting the audio generator-1". Adjust the voltage at IC701 pin-1 so that the voltage is minimized by changing the
WIDEBAND value on PAGE 5-2 using the VOLUME UP/DOWN keys of the jig remote controller.
2. Establish the "Setting the audio generator-2". Adjust the voltage at IC701 pin-1 so that the voltage is minimized by changing the
SPECTRAL value on PAGE 5-3 using the VOLUME UP/DOWN keys of the jig remote controller.