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CIRCUIT:
AM Oscillator PWB Output and Diver PWB Input.
TEST POINT: TP4 (blue) on Driver PWB.
MODE:
S1 on Recycle PWB in CONT. Shutdown switch ON.
rated power into dummy load or antenna.
Full
INDICATION
REMARKS
ACTION
circuit
DC Voltages
0 to 0.5 V
Shutdown
operating.
Reset
shutdown
switch. Check shut-
down level.
Check
Modulation
CIRCUIT:
Driver Output.
TEST POINT: TP2 (red) on Driver PWB.
MODE:
S1 on Recycle PWB in CONT. Shutdown switch OFF.
rated power into dummy load or antenna.
Full
INDICATION
REMARKS
ACTION
DC Voltages
Normal.
+48 to +55 V
0 V
Wave forms
No output from +50 V
power supply.
Normal. Peak-to-Peak
voltages will vary
according to drive
requirements
of
individual transmit-
ters. Vp_p.Up to i00
volts norma±.
Asymmetrical
wave-
form indicates one-
half of driver stage
not
operating
or
large difference in
gain between driver
transistors.
Check AC input volt-
age.
Check circuit
breaker
in
transmitter.
If
operating from bat-
teries,
determine
that they are charged
land battery standby
switch is on.
Measure
voltage
across
emitter
resistor
of
each
transistor;
compare.
Check AC waveform
across
emitter
resistor.
SS-800AVS
Southern Avionics
Company
119
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