7
-
4 - 4. P. L. L.
1.
Check (A) with an oscilloscope. A lock failure is indicated by an instability or absence of the wave
form. Check as follows:
2.
Check the Frequency of the master oscillator
(7.68MHz).
If a
7.5KHz
5Vp-p squarewave is not
observed at (B), measure DC voltage on Pin
5
of IC203 if no oscillation.
3.
Wave measure the output of (C) and (D) with an oscilloscope.
4.
Measure DC voltage of 0201, 0202, 0203, 0204 and 0205.
5.
If the transmit or receive frequency differs from the programmed frequency, check the voltage of
A1 to
C4
on the IC201 (BCD control lines from matrix board).
A
B
c
D
7-5
G
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Содержание IC-H12
Страница 1: ...VHF RADIOTELEPHONE 12 channels l C H 2 MAINTENANCE MANUAL...
Страница 50: ...PLL UNIT IL w c 8 2 0 0...
