Kyocera TASKalfa 420i Service Manual page 216

2KR/2KS
Problem
(13)
Transfer charging is
not performed.
(14)
The original size is
not detected cor-
rectly.
(15)
The touch panel keys
do not work.
(16)
The message
requesting paper to
be loaded is shown
when paper is
present on the cas-
sette 1/2 or MP tray.
(17)
The size of paper on
the cassette 1/2 or
MP tray is not dis-
played correctly.
1-4-58
Causes
1. The connector terminals
of the high voltage PWB
make poor contact.
2. Defective engine PWB.
3. Defective high voltage
PWB.
1. Original is not placed cor-
rectly.
2. Poor contact in the origi-
nal detection switch or
original size sensor con-
nector terminals.
3. Defective original detec-
tion switch.
4. Defective original size
sensor.
1. Poor contact in the touch
panel connector termi-
nals.
2. Defective touch panel or
main operation PWB.
1. Poor contact in the con-
nector terminals of paper
switch 1/2 or MP paper
switch.
2. Defective paper switch 1/
2 or MP paper switch.
1. Poor contact in the con-
nector terminals of paper
size length switch 1/2,
paper size width switch
1/2, MP paper size length
switch or MP paper size
width switch.
2. Defective paper size
length switch 1/2 or MP
paper size length switch.
3. Defective paper size
width switch 1/2 or MP
paper size width switch.
Check procedures/corrective measures
Reinsert the connector. Also check for continuity within the con-
nector cable. If none, remedy or replace the cable.
Check if YC13-10 on the engine PWB goes low when mainte-
nance item U101 is run. If not, replace the engine PWB.
Check if transfer charging takes place when CN1-10 on the high
voltage PWB goes low while maintenance item U101 is run. If not,
replace the high voltage PWB.
Check the original and correct if necessary.
Reinsert the connector. Also check for continuity within the con-
nector cable. If none, remedy or replace the cable.
If the level of YC4-2 on the ISM PWB does not go low when the
original detection switch is turned on and off, replace the original
detection switch.
Check if sensor operates correctly. If not, replace it.
Reinsert the connector. Also check for continuity within the con-
nector cable. If none, remedy or replace the cable.
If any keys do not work after running the maintenance item U201
to initialize the touch panel, replace the touch panel or main oper-
ation unit PWB.
Reinsert the connector. Also check for continuity within the con-
nector cable. If none, remedy or replace the cable.
If the level of following terminal on PWB does not change when
the switch is turned on and off, replace the switch.
Paper switch 1: YC8-B12 on the feed PWB
Paper switch 2: YC8-B18 on the feed PWB
MP paper switch: YC12-A6 on the engine PWB
Reinsert the connector. Also check for continuity within the con-
nector cable. If none, remedy or replace the cable.
If the level of following terminal on PWB does not change when
the switch is turned on and off, replace the switch.
Paper size length switch 1: YC8-B2 on the engine PWB
Paper size length switch 2: YC8-A19 on the engine PWB
MP paper size length switch: YC12-B14 on the engine PWB
If the level of following terminal on PWB does not change when
the width guide in the cassette 1/2 or insert guide on the MP tray
is moved, replace the switch.
Paper size width switch 1: YC9-3, 4, 5 on the engine PWB
Paper size width switch 2: YC9-9, 10, 11 on the engine PWB
MP paper size width switch: YC12-A1, A2, A3 on the engine PWB