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)
7-5
G
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·©
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