Motorola MICOM-3F - Transmitter Troubleshooting Flowchart

Start
Transmit to a
dummy load
Antenna and/or
antenna tuner problem
A
Transmission
possible
Problem persists
Is transmission
in AME mode
posible?
Check the Harmonic
filter ranges
No
Check the HF and/or
its control lines
Problem in
one range
Problem in all ranges
Check the 9T, 9R, PA
disable lines
Check the PTT path
from the mic connector
to the Lord board
Problem
found
No problem found
Check from High-
Power board to
antenna
Check from the mic
audio input to DSM
output
Problem
persists
Transmission possible
Check from the mic
audio input to Control
Head board output
Yes
Problem
found
Problem
found
Check the flat cable
between the Control
Head and the LORD
board
Problem persists
Problem
found
Problem
persists
Check DSM & DSP
Check PA power
transistors
Problem
found
Check PA
Problem
found
Transistors OK
Check the HP as a
separate unit
Problem
found
Figure 6-2.A. Transmitter Troubleshooting Flowchart (Sheet 1 of 2)
6-4 Cat. No. 6886859J01