6-12
FS-1800/1800N | FS-3800/3800N
(2) A2 Abnomal high temperature error
(1) A0 Zero cross signal error
No
Call service
personA2:0123456
Remove and check
harness (S02415)
between fuser board
(KP-756) and power
supply unit.
Yes
Yes
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.
Meaning Suggested causes Corrective action
The ZCROSS signal
does not reach the
engine board within
3 seconds after power
on.
• Defective power supply unit.
• Defective CPU U201 on the engine board.
Replace power supply
unit. See page 5-22.
Replace engine board. See
page 5-22.
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