Troubleshooting Flow Chart - Sangean MMR-77 Service Manual

TROUBLESHOOTING FLOW CHART

( 1 ) Weak sensitivity on FM mode
Check whether the sensitivity is
recovered if antenna is directly
connected to the point between
C1.
No
Check IF waveform.
No
Check C6 and L2.
( 2 ) Weak sensitivity in AM band
Check the antenna circuit and
antenna terminal.
No
Check whether If is normal.
Yes Check the antenna terminal and
antenna circuit.
Yes
Check CF1, t1.
No
Check T1 and IC1.
Check whether the antenna circuit
is normal. (L1, C4)
16
Yes