14: Maintenance
14-4
PRC1099A-MS
14.2.3
Signal Generator
You can use a signal generator to inject controlled signals of a known
frequency and amplitude into different circuits of the transceiver. For
example, you can use the signal generator as a temporary substitute for one of
the local oscillators.
14.2.4
Frequency Counter
Apart from frequency calibration, you can use a frequency counter to service
the synthesizer. By connecting the counter to different points in the circuitry,
you can verify that the correct divide ratios are occurring in the synthesizer.
14.3
Disassembly
The PRC1099A is designed with individual boards that are easily replaced in
the field.
14.3.1
Chassis Disassembly
To disassemble the PRC1099A:
1. Stand the radio on its front panel (refer to Figure 14-3 on page 14-5).
2. Remove the battery case and battery by releasing the latches on each
side of the radio case and separate the battery case from the radio case
(refer to Figure 14-3 on page 14-5).
3. Remove the radio case by loosening the captive screws and pulling the
case from the front panel (refer to Figure 14-4 on page 14-6). If
necessary, insert a flat-blade screwdriver between the front panel and
the case to pry off the case.
Figure 14-2 Two-Tone Test Signal
