TEST
#7
SWEEP CIRCUITS (Cont'd.)
(
,.:s~)
Measure the voltage
at
pin 3
of
U202 and rotate the
TRIG LEVEL control back and forth through its
center
of
rotation. Pin 3 should change state.
Measure the voltage
at
pin 5 of U201. It should be
low.
Measure
the
voltage at pin 8 of U201. It should be
low.
~
r---------------~
~----------------,
Check
0216
and associated foils.
The sweep and control circuits are OK.
Trigger amplifi
er
or
U202 is defective. Also check
wiring.
U201
defective,
or
wiring
or
foils open between pin 1
and deck A
of
the TIME/CM switch.
U201
is defective.
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