Service manual

D. Operational Error Codes
During radio operation, the radio performs dynam-
ic tests to determine if the radio is working properly.
Problems detected during these tests are presented
as error codes on the radio’s display. The presence of
an error code should prompt a user that a problem
exists and that a service technician should be contact-
ed. Use Table 16 to aid in understanding particular
operational error codes.
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Table 16. Operational Error Code Displays
Error Code Description Corrective Action
FAIL 001 Synthesizer Out-of-Lock a. Reprogram codeplug
b. Replace RF Board
FAIL 002 Selected Mode/Zone Codeplug Checksum Error Reprogram codeplug
Table 17. Receiver Troubleshooting Chart
Symptom Possible Cause Correction or Test (Measurements Taken at Room Temperature)
Radio Dead; 1. Dead Battery Replace with charged battery.
Display Does 2. Blown Fuse Check see-through fuse on RF board near the B+ connector.
Not Light Up 3. On/Off Switch With the radio on, check for B+ SENSE at P901 pin 10 of the control top/
PTT flex; if not there, check for UNSW B+ at pin 19 of RF board connector;
if not there, replace the RF board; if there, replace the controller
board.
4. Regulators Check for +5V at P901 pin 5 of the control top/PTT flex;
if not there, replace the controller board.
Radio Dead; 1. Controller Check board for communication with RSS. If no communication,
Display Board replace controller board.
Lights Up 2. RF Board Check the ODC (output data clock) at pin 8 of the RF board
connector for 2.4MHz. If not there, replace RF board.
No Receiver 1. Programming a. Does the transmitted signal match the receiver
Audio or configuration (PL, DPL, etc.)?
Receiver Does b. With the monitor function enabled, can the radio be unmuted?
Not Unmute
Audio Distorted 1. Synthesizer Check synthesizer frequency by measuring the transmitter frequency;
or Not Loud Not On if off by more than ±250Hz, realign.
Enough Frequency
RF Sensitivity 1. Synthesizer Check synthesizer frequency by measuring the transmitter frequency;
Poor Not On if off by more than ≤ ±600Hz, realign.
Frequency
2. Antenna Switch Visually check for proper mechanical positioning of the antenna switch
to the RF board; re-position if necessary. Then, check for electrical
continuity between the center pin of the antenna connector and the
RF board; replace defective item.
3. Receiver Check RF front-end tuning for optimum sensitivity using the RSS.
Front-End
Tuning
(VHF/UHF only)
Radio Will 1. Controller Does B+ SENSE at P901 pin 10 of the control top/PTT flex switch on and
Not Turn Off Board off as the on/off switch is operated? If not, replace the controller board.