Download FS-1800/N FS

(1) A0 Zero cross signal error
Meaning
Suggested causes
The ZCROSS signal • Defective power supply unit.
does not reach the
engine board within
• Defective CPU U201 on the engine board.
3 seconds after power
on.
Corrective action
Replace power supply
unit. See page 5-22.
Replace engine board. See
page 5-22.
(2) A2 Abnomal high temperature error
Meaning
CPU U201 detected
that the HTEMP*
signal (Abnormal
temperature of more
than approximately
220 °C) is low for
more than 3 seconds.
Suggested causes
Corrective action
• Defective CPU U201 or comparator U205 Follow the flow chart
on the engine board.
below.
• Defective engine board (KP-864).
• Defective thermistor.
• Defective photo coupler on the power supply
unit for the heater lamp.
Call service
personA2:0123456
Turn power switch off.
CAUTION:
Fuser unit is fed directly by AC
power from primary circuit on power
supply board.
Be careful with electricshock.
Remove and check
harness (S02415)
between fuser board
(KP-756) and power
supply unit.
No
OK?
Yes
Replace harness (S02415)
between fuser board (KP756) and power supply unit.
Turn power switch on.
Replace fuser unit. See
page 5-29.
Measure voltage at pin
#6 (THERM) of YC831
on fuser board (KP-756).
More
than 3 V DC over 3
seconds?
NOTE:
If the problem is not solved by
this flow chart replace, the
following items:
No
Replace engine board
(KP-864). See page 5-22.
Yes
FS-1800/1800N | FS-3800/3800N
6-12
Engine board (KP-864)
Power supply unit
Fuser unit