Troubleshooting
12 Apollo SL40 Field Maintenance Manual
EQUIPMENT TESTS
The tests in the following paragraphs will isolate an SL40 problem to the Com Main
board level. If the unit fails any of the tests in either the Transmitter or Receiver sections,
refer to the Disassembly/Reassembly procedures on Page 22 for instructions on removing
the faulty component. The operating specifications listed below are effective for all
equipment tests.
Input voltage 10 Vdc to 40 Vdc, reverse polarity protected
Input current 300 mA typical, 2 A maximum at 13.75 V dc, receive 140
mA typical, 900 mA at 27.5 Vdc, receive 2.1 A typical, 3.2
A maximum at 13.75 Vdc, transmit 1.0 A typical, 1.4 A
maximum at 27.5 Vdc, transmit
NOTE: Receiver maximum at full receive audio, transmit maximum at
90% modulation at 1000Hz.
Input power 4 watts typical, receive 28 watts typical transmit.
Internal fuse 7 amp fast blow, solder on board.
Antenna requirements Standard 50Ω vertically polarized with VSWR <2.5:1.
a) There are no adjustments for the SL40.
b) These test procedures should be performed with the SL40 on the service bench to
isolate suspected service failures. The same tests can be used after replacement of
subassemblies to verify proper operation prior to returning the SL40 to service,.
c) The HP 8920 AM software (HP 11807A) will automatically test the SL 40. The
specifications are listed in the SL40 VHF COMM Transceiver Installation Manual.
d) Perform all tests at normal room temperature (68° to 72° F).
e) Complete the transmitter frequency test before performance evaluating the receiver.
NOTE: All RF voltages are "HARD" Micro volts. "Hard" micro volts
indicates use of a 6 dB pad between the signal generator and the
receiver. When using the HP 8920 “HARD” should be set in the
test equipment configuration MENU.
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