6-18
FS-1900
A
Ye s
Ye s
No
No
No
Call service
6000:0123456
Remove and check
harness (S02415)
between fuser board
(KP-756) and power
supply unit, or
thermistor connector
(YC834) on the
fuser board (KP-756).
0 V DC
at pin #6 (THERM)
of YC831 on fuser board
(KP-756) ?
Ye s
Ye s
No
Replace harness (S02415)
between fuser board (KP-756)
and power supply unit.
OK?
"E4"
shown?
End.
Turn power switch on.
Turn power switch off,
and remove power cable.
Turn power switch off.
Turn power switch on.
Detach connector CN2
A on power supply
board.
Measure resistance
between pins 1 and 3
of the detached
connector.
Replace power supply
unit. See page 5-22.
Replace engine board
(KP-864). See page 5-22.
Replace fuser unit. See
page 5-29.
Open (infinite)?
CAUTION:
Fuser unit is fed directly by AC
power from primary circuit on power
supply board.
Be careful with electricshock.
Fuser unit is extremely hot
immediately after the printer was
running. Allow substantial period of
time until it cools down.
See figure right.
Heater lamp
1
3
Replace fuser unit. See
page 5-29.
Meaning Suggested causes Corrective action
HTEMP* remains
high for longer than
4 seconds since
the heater lamp is on.
The heater lamp
continues to be turn
on for longer than
60 seconds.
Blown-out thermistor.
Blown-out heater lamp.
Defective CPU U201 or comparator U205 on
the engine board.
Improper connector insertion.
Defective power supply unit.
Defective harness between fuser unit and power
supply unit.
Follow the flow chart
below.
(13) 6000 - Fuser unit error
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