Tandy 1400LT - IRGB Check

@ IRGB Check
Q
Check the connectors
and cable connected
to the Monitor.
I
Is Monitor switch
(SW2) ON?
I
1
Check frequency of CTL2
It must be 21.4772MHz.
Check Pin1 and Pin19
of IC31.
CRTG ENABLE signal
(Low level
is output from
Pin30
of CATE3)
NO
I
Check
IC31 and
GATE3.
Check waveform
CN1:
3, 4, 5, 6, 8
and 9.
I
Check
IC31 and IC30.
I
Change
Monitor.
END
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