On / Off Logic - Philips 22 DC 397 Service Manual

ON / OFF LOGIC
If one or more of these conditions are not fulfilled the On / Off logic will not work properly.
ADJUSTMENTS
Perform all adjustments and measurements under foiiowing conditions, if not otherwise stated:
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Power supply: 14,4 V
FM: RF = 98,0 MHz; m = 22,5 kHz; AF = 1 kHz; Level = 1 mV_
Stereo: pilot = 9 % (6,75 kHz) >
RDS: carrier = 1,7 %
Aerial: 150 Q; -6 dB standard aerial (set E = E')
AM: RF = 1053 kHz; m = 30 %: AF = 1 kHz; Level = 1 mV
Aerial: -14 dB standard aerial; for measurements adjust 14 dB offset
FM Aerial -6 dB: AM Aerial -14 dB: a.
E
sj
Note: Set E = E' Note: Adjust offset = 14 dB
How to adjust the noise detector
RF = 98 MHz; m = 75 kHz; AF = 40 kHz; Level = 1 mV
Adjust pot 3426 to get an output of 850 mV (AC) at pin 14 of IC 7420.
Dolby level
Use the test cassette TEAC MTT150 to adjust the Dolby level.
Set pot 3540 and 3543 to get an output of 387,5 mV (AC) at pins 1 and 24 of the Dolby IC (Pos. 7510).
22DG397. 40 PCS 87 823