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CIRCUIT:
Auto Shutdown PWB.
TEST POINT: TP2 (yellow) on Auto Shutdown PWB.
MODE:
Keyed modulation. S1 on Recycle PWB in IDENT. Shutdown
switch ON. Full rated power into dummy load or antenna.
100% modulation.
DC Voltages
INDICATION
REMARKS
ACTION
Normal.
Voltage at TP2 pul-
sates during ident
from 0 to
1-2.5 V
during
keying.
Transmitter
output
remains normal.
0 V
No Keying in output
circuit, malfunction
Q2 through Q5, etc.
R6 Auto Shutdown PWB
level
adjustment
alignment improper.
Check
transmitter
output
for keying.
Perform
resistance
voltage measurements
on circuit concerned.
CIRCUIT:
Auto Shutdown PWB.
TEST POINT: TP2 (yellow) on Auto Shutdown PWB.
MODE:
Shutdown switch OFF.
INDICATION
REMARKS
ACTION
Normal.
Transmitter returns
to
normal
output
(without keying) form
previous test.
DC Voltages
TP Voltage drops to 0
but transmitter does
not shutdown after 15
to 60 seconds delay.
Circuit malfunction
~Q6~ Q7, Q8. Switch
iSl defective.
iCheck auto
circuit.
shutdown
124
Southern Avionics
Company
SS-800AVS
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