6-19
FS-1900
(14) 6020 - Abnormal high temperature error
No
Call service
6020:0123456
Remove and check
harness (S02415)
between fuser board
(KP-756) and power
supply unit.
Ye s
Ye s
No
Replace harness (S02415)
between fuser board (KP-
756) and power supply unit.
OK?
Replace engine board
(KP-864). See page 5-22.
Replace fuser unit. See
page 5-29.
CAUTION:
Fuser unit is fed directly by AC
power from primary circuit on power
supply board.
Be careful with electricshock.
Measure voltage at pin
#6 (THERM) of YC831
on fuser board (KP-756).
Turn power switch off.
Turn power switch on.
More
than 3 V DC over 3
seconds?
NOTE:
If the problem is not solved by
this flow chart replace, the
following items:
Engine board (KP-864)
Power supply unit
Fuser unit
Meaning Suggested causes Corrective action
CPU U201 detected
that the HTEMP*
signal (Abnormal
temperature of more
than approximately
220 °C) is low for
more than 3 seconds.
Defective CPU U201 or comparator U205 on
the engine board.
Defective engine board (KP-864).
Defective thermistor.
Defective photo coupler on the power supply
unit for the heater lamp.
Follow the flow chart
below.
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