Ricoh FT7770 Service Manual page 570

30 April, '89
I
Is the voltage between CN302-B14 (1,100W) or CN302-
A15 (550W) and TP215 0 volts?
Y N
Replace the main board.
Replace the dc drive board.
Replace the fusing thermistor.
Service Call 8 - Thermofuse
o The CPU receives the thermofuse failure signal for more than 2
seconds.
Is the thermofuse open circuit?
Turn the main switch on.
Is the voltage between 304-B13 and CN303-5 24 volts?
Replace the dc drive board.
Replace RA101.
Replace the thermofuse.
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