Sangean MMR-77 - Troubleshooting Flow Chart

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