6-20
FS-1900
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.
(15) 6400 - Zero cross signal error
Call service
7001:0123456
Replace with a new
toner kit. See page 3-4.
Ye s
No
"E9"
shown?
Replace engine board
(KP-864) and developer.
See page 5-22 and 3-13.
High voltage unit
End.
Harness (S02416) [Between developer and high voltage unit]
Harness (S02416) [Between engine board and high voltage unit]
NOTE:
If the problem is not solved by
this flow chart, replace the
following items:
Meaning Suggested causes Corrective action
Toner motor is
overloaded.
TNMOC is detected
by sampling every
other 100 ms in 2
seconds since the
main and toner
motors are activated
following the Replace
toner Clean printer
message after the
Toner low TK-60 is
detected.
Overcurrent in the toner motor circuitry due to
an excessive torque, caused by hardened toner.
Defective gate array U204 on the engine board.
Improper connector insertion.
Defective harness between developer and high
voltage unit.
Defective harness between high voltage unit
and engine board.
Follow the flow chart
below.
(16) 7001 - Toner motor error
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