Motorola MICOM-3F - Receiver Troubleshooting Flowchart

Start
Check Harmonic filter
range and its control
lines
Is any sound
heard at the
loudspeaker?
Check the
Harmonic filter ranges
Check from Control
Head board to speaker
NoYes
Problem
found
Problem
found
Check coax from High-
Power to LORD board
Check from LORD
input to speaker
Ranges OK
Reception possible
Check coax connectors
Problem
found
Check LORD board
Problem
found
Check synthesizer
Is the input
signal to the
first mixer OK?
Check first injection
Check front-end
pre-selector
NoYes
Problem
found
Check first mixer
Check 45.1 MHz signal
(IF filter)
Problem
found
A
Figure 6-1.A. Receiver Troubleshooting Flowchart (Sheet 1 of 2)
6-2 Cat. No. 6886859J01