Utax DF 420, Service Manual, Page: 29 / 53

3MJ
1-4-2
(3) Paper misfeeds
Problem Causes/check procedures Corrective measures
(1)
A paper jam in built-
in finisher is indicated
as soon as the main
power switch is
turned on. A piece of paper torn from
copy paper is caught
around the paper conveying
switch. Check visually and remove it, if any.
Defective paper conveying
switch. With 5 V DC present at YC2-23 on the finisher control PWB,
check if YC2-21 on the finisher control PWB remains low when
the paper conveying switch is turned on and off. If it does, replace
the paper conveying switch.
(2)
A paper jam in fin-
isher is indicated dur-
ing copying (jam
between the finisher
and machine).
Jam code 80 Extremely curled paper. Change the paper.
Defective paper conveying
switch. With 5 V DC present at YC2-23 on the finisher control PWB,
check if YC2-21 on the finisher control PWB remains low or high
when the paper conveying switch is turned on and off. If it does,
replace the paper conveying switch.
(3)
A paper jam in fin-
isher is indicated dur-
ing copying (finisher
paper entry nonar-
rival jam).
Jam code 81 Extremely curled paper. Change the paper.
Defective paper conveying
switch. With 5 V DC present at YC2-23 on the finisher control PWB,
check if YC2-21 on the finisher control PWB remains low or high
when the paper conveying switch is turned on and off. If it does,
replace the paper conveying switch.
(4)
A paper jam in fin-
isher is indicated dur-
ing copying (finisher
paper entry jam).
Jam code 83 Defective paper conveying
switch. With 5 V DC present at YC2-23 on the finisher control PWB,
check if YC2-21 on the finisher control PWB remains low or high
when the paper conveying switch is turned on and off. If it does,
replace the paper conveying switch.
Check if the feedshift roller
or feedshift pulley is
deformed. Check visually and replace.
(5)
A paper jam in fin-
isher is indicated dur-
ing copying (finisher
eject jam).
Jam code 84 Defective paper conveying
switch. With 5 V DC present at YC2-23 on the finisher control PWB,
check if YC2-21 on the finisher control PWB remains low or high
when the paper conveying switch is turned on and off. If it does,
replace the paper conveying switch.
Check if the feedshift roller
or feedshift pulley is
deformed. Check visually and replace.
Check if the eject roller or
eject pulley is deformed. Check visually and replace.