Motorola MICOM-3F Service Manual page 57

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