14: Maintenance
14-16
PRC1099A-MS
These come in many forms, but even a simple type, consisting of a
suction pump with a teflon tip, is satisfactory.
3. After all solder is removed, remove the component leads from the
solder pad with a gentle tug.
To reduce the risk of damaging the board, do not exert any stress on
the foil solder pad while removing the component, especially when the
connection is hot. The copper foil adhesive forms an extremely strong
bond to the board when cold, but can be removed fairly easily at
soldering temperature.
4. Before installing the new component, clear the holes of any remaining
solder by again applying heat and using the desoldering tool.
A frequent cause of foil damage is pushing the component through the
hole and melting the solder at the same time. If the lead catches, it
frequently lifts the foil from the board.
14.6
Troubleshooting
14.6.1
General Fault Location
Non-technical personnel can determine the reason for many faults without
opening the transceiver case. The table below lists the faults that can be
identified by using the front panel controls.
Table 14-2 General Fault Location Chart
Symptom
Possible Fault
Action
No Display
Battery dead
Turn
Mode
switch to
USB
and listen for receiver
noise. No noise indicates a dead battery.
Receiver noise indicates a display fault.
No Audio
Handset fault
Check for sidetone during TX. If sidetone is
present, handset is operative and a receiver fault
is indicated.
No Sidetone
(RX Audio Present)
Transmitter not operating
Absence of an audible tone in the handset
speaker means the transmitter is not providing
the correct output power. Sidetone audio is
inhibited by lack of RF output. Retune the
antenna; an incorrect match can restrict output
power.
Sidetone Distorted
Fault in transmitter exciter
or receiver
The sidetone is generated by listening to the
transmitted signal in the receiver. This provides a
positive test that the low-level stages are
operating correctly.
Battery Icon
Illuminated
Battery voltage low
Replace and recharge battery.
