Icom IC-H6 Service Manual page 21

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 (5.12MHz). If a 2.5KHz 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
Al to C4 on the IC201 (BCD control lines from matrix board).
A
B
c
D
..
E
{A) (0)
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