Ricoh G081, Руководство по обслуживанию

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PRINT PROCESS
SM 6-31 G081/G092
Detailed
Des
cription
s
Temperature detection
The thermistor signals, TH1HIGH and TH2HIGH, indicate that the temperature of
the fusing belt has become too high. The TH1HIGH circuit is closed when
thermistor 1 [
0
] detects high temperature in the middle of the fusing belt. The
TH2HIGH circuit is closed when thermistor 2 [ 0 ] detects high temperature at the
far side (rear) of the fusing belt. The signal TH1HIGH is used to control the fusing
temperature (
)
Fusing temperature control ). The table lists the pin locations.
(Refer to illustration on pg. 6-29.)
Pin No. In/Out Signal
Name
CN15 CN1601 CN15 CN1601
Remarks
TH1HIGH 2 6 In Out
Detects high temperature
in the middle of the belt
TH2HIGH 3 5 In Out
Detects high temperature
at the rear end of the belt
CN15: On engine control board
CN1601: On fusing unit
NOTE: If several sheets of narrow-width paper are continuously fed, the
temperature at the ends of the belt become much higher than the
temperature in the middle. Thermistor 2 (TH2HIGH) prevents the ends of
the belt from overheating.