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PCB BS 398
Denomination
Adjustment procedure for IF section
Instruments used:
Note: See legend of test points (TP) at the end of adjustment
Preliminary operations:
connected the maximum resistance.
ADJUSTMENT PROCEDURE
Tuner IF video/IF audio
markers at: 31.5, 33.5, 35.1.
36.5, 39.5, 41.5 and 37.1125 MHz
for adjustment of output filter.
pass-band.
IF signal (video carrier
39.5 MHz and audio carrier
33.5 MHz) with 100% standard
video modulation, bar modulating
signal, 20% white level - 76%
black level.
Audio carrier modulated at 1 kHz
with + 50 kHz of deviation at
50 /us of preemphasis.
200 mA power supply.
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