SYMPTOMS
CHECKS
Radio Will Not Program
When Plugged Into The
TG3310 Interface Module
Radio must be turned "on" before programming. Connect the handset and press the on/off
power switch.
Distorted Tx Audio
Check grounding between all Boards and the casting.
Check the Tx mod input to the RF Board. If distorted, a faulty Audio board is likely.
Check the mute commands, If incorrect, a faulty Logic board is likely.
If the tones are distorted, check the tone generation circuitry on the Logic Board.
Transmitter Off
Frequency
Suspect the RF board. Refer to "Frequency Set" procedure in the Transmitter Alignment
section of this manual. Check the synthesizer load command. If the load command is
wrong, a faulty Logic Board is likely.
Calls Processed
Incorrectly
Check Personality PROM programming. Check for proper Tx and Rx operation. Refer
to Tx and Rx Verification Procedures.
If verification OK, determine if the problem is in the transmit or receive circuit.
Rx decode check: Use FCN 1 and FCN 3 test mode commands. Modulate the
generator with the correct tone sequence and busy tone. If the test fails, check the
limited data output from the Audio board. If the data is present, the Logic Board may
be faulty. If the data is not present, the Audio Board may be faulty.
Tx encode check: Use FCN 08 for the encode test. If the test fails, the Audio or Logic
Board may be faulty. Look for proper tones to the Audio Board and proper unmute
commands from the Logic board. If all inputs are correct, the Audio board may be
faulty. If all inputs are not correct, the Logic Board may be faulty.
Tx/Rx/Encode/Decode OK: Check for proper synthesizer switching time. Use FCN
10 for the test. If the switching time is incorrect, the RF Board may be faulty.
Improper Direct Mode
Use the FCN 21 command and check the BANDSWITCH LINE. If the command is
correct, the RF Board may be faulty. If the command is incorrect, the Logic board may
be faulty.
The radio must be equipped with talk-around option for direct mode operation to work
properly. DAMAGE to the radio may occur if the radio is placed in talk-around
transmit mode without the talk-around option board installed.
CAUTION
SYPTOMS AND CHECKS (CONTINUED)
LBI-38701
10
Summary of Contents for LBI-38701
Page 6: ...Figure 4 Top View Figure 3 Bottom View Without Duplexer LBI 38701 6 ...
Page 21: ...AUDIO SIGNAL FLOW DIAGRAM LBI 38701 Figure 6 Audio Signal Flow Diagram 21 ...
Page 22: ...LBI 38701 CONTROL SIGNAL FLOW DIAGRAM Figure 7 Control Signal Flow Diagram 22 ...
Page 23: ...POWER DISTRIBUTION DIAGRAM LBI 38701 Figure 8 Power Distribution Diagram 23 ...