Oki OKIPAGE6w Troubleshooting Manual page 17

Flowchart of Thermistor Circuit Check
Short check timer(t16)set
No
Short error TEMP ?
Thermistor error check
Thermistor disconnection
check timer (t35) set
error check timer (t2)
disconnection check timer
t2 =
t16 =
t35 =
START
HEATER OFF
Time-out ?
Yes
Yes
No
timer (t2) set
Heater On
Yes
Temperature > Tn
No
Thermistor
No
within time
Yes
Thermistor
No
(t35) within time
Yes
A/D value changed?
90 sec
520 msec
10 sec
disconnection error
Thermistor short error
End
temperature control
No
Thermistor gain change
Yes
No
A/D value more than
Thermistor
End
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To constant
Fuser error
End
THCHK-N"0" "Z"
20H?
Yes
Fuser error
End