TM 55-1930-209-14&P-12
Maintenance on the transceiver should be performed in the following sequence.
1.
Performance Test - Conducted to check the overall performance of the transceiver. Should be performed prior to
the sale/installation of the radio and prior to any corrective maintenance.
2.
Alignment/Adjustment - Conducted if the transceiver fails the Performance Test and/or a critical electrical
component has been replaced in the transceiver. In addition, SCC recommends that the radio be returned
whenever maintenance is performed on it.
3.
Troubleshooting - Isolates a fault in the transceiver.
Remove the covers from the radio to obtain access to the test and adjustment points. Connect the radio to a suitable DC
source (+13.8 VDC ±20%). Test equipment hookup for alignment procedure is illustrated in Figures 6 and 9. Alignment
reference points locations are illustrated in Figures 7 and 8.
TEST EQUIPMENT
The following maintenance procedure is supplied assuming the repair technician has access to the following test
equipment, or its equivalent.
EQUIPMENT
MODEL
FM Communications Monitor
Cushman CE-6A
RF Wattmeter w/50 Ohm Load
Bird 6154
Tone Generator
Cushman CE-11
Voltmeter
Hewlett Packard 427A
RF Probe
Hewlett Packard 11096B
Frequency Counter
Hewlett Packard 5314A
Scope
Hewlett Packard 1220A
DC Microammeter
Simpson 374
Power Supply
Adjustable 9.5 V to 17 V 25 Amp.
Optional (Recommended but not required)
RF Spectrum Analyzer
Hewlett Packard 8558B w/Display
Digital Voltmeter
Danameter 2000
Signal Generator
Wavetech 3000
Sinadder
Helper Instruments
PERFORMANCE TEST
I.
Transmitter
1.
Connect a wattmeter w/50 ohm dummy load to the antenna receptacle.
2.
Set the power mode switch to the high position.
3.
Key the transmitter by depressing the microphone PTT switch.
4.
Verify that the power output is 25 watts minimum on channels 06, 16, and 26.
5.
Set the power mode switch to the low position.
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