Cessna 177 SERIES Service Manual page 300

TROUBLE PROBABLE CAUSE REMEDY
'POWER LOW Low battery voltage. 1. Set toggle switch to off.
2. Remove plastic plug from the remote jack
and by means of a Switchcraft #750 jackplug,
connect a Simpson 260 model voltmeter and
measure voltage. If the battery-pack voltage
on the 6-cell magnesium battery pack trans-
mitter is 10.8 volts or less, and on the 4-cell
lithium battery pack transmitters is 11.2 volts
or less, the battery pack is below specification.
Faulty transmitter. 3. If the battery-pack voltage meets the
specifications in step 2, the battery-pack
is O. K. If the battery is O. K., check the
transmitter as follows:
a.
Remove the voltmeter.
b. By means of a switchcraft 750 jackplug
and 3 inch maximum long leads, connect a
Simpson Model 1223 ammeter to the jack.
c. Set the toggle switch to ON and observe
the ammeter current drain. If the current-
drain is in the 85-100 ma range, the
transmitter or the co-axial cable is faulty.
Faulty co-axial 4. Check co-axial antenna cable for high
antenna cable. resistance joints. If this is found to be
the case, the cable should be replaced.
*This test should be carried out with the co-axial cable provided with your unit.
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