Kyocera TASKalfa 420i Service Manual page 180

2KR/2KS
Problem
(41)
A paper jam in fin-
isher is indicated dur-
ing copying (main
tray eject jam).
Jam code 88
(42)
A paper jam in fin-
isher is indicated dur-
ing copying (center-
folding unit jam).
Jam code 89
(43)
A paper jam in fin-
isher is indicated dur-
ing copying (mailbox
jam).
Jam code 90
(44)
A paper jam in fin-
isher is indicated dur-
ing copying
(switchback sensor
jam).
Jam code 93
(45)
A paper jam in fin-
isher is indicated dur-
ing copying (paper
entry sensor stay
jam).
Jam code 94
1-4-22
Causes/check procedures
Defective eject switch 1.
Defective sensor/switch.
Defective tray eject sensor.
Defective switchback sen-
sor.
Check if the switchback
motor malfunctions.
Check if the switchback
roller and switchback pul-
ley contact each other.
Check if the switchback
guide is deformed.
Defective finisher main
PWB.
Extremely curled paper.
Defective paper entry sen-
sor.
Check if the paper entry
guide is deformed.
Defective finisher main
PWB.
Corrective measures
Run maintenance item U241 and turn eject switch 1 on and off
manually. Replace the switch if indication of the corresponding
switch on the touch panel is not displayed in reverse.
Run maintenance item U241 and turn the following switch on and
off manually. Replace the switch if indication of the corresponding
switch on the touch panel is not displayed in reverse.
Centerfold paper entry sensor, centerfold eject switch, centerfold
paper conveying sensor
Run maintenance item U241 and turn tray eject sensor on and off
manually. Replace the switch if indication of the corresponding
switch on the touch panel is not displayed in reverse.
With 5 V DC present at CN3-5 on the finisher main PWB, check if
CN3-7 on the finisher main PWB remains low or high when the
switchback sensor is turned on and off. If it does, replace the
switchback sensor.
Check.
Check and remedy.
Check and remedy.
Replace the finisher main PWB and check for correct operation.
Change the paper.
With 5 V DC present at CN3-1and CN3-3 on the finisher main
PWB, check if CN3-2 and CN3-4 on the main PCB remains low or
high when the paper entry sensor is turned on and off. If it does,
replace the paper entry sensor.
Check and remedy.
Replace the finisher main PWB and check for correct operation.