Kyocera TASKalfa 5551ci - Fuser IH PWB Communication Error; Current PWB Error

2L6/2N6/2N5/2N4-3
1-4-137
6950 Fuser IH PWB communica-
tion error
No response is received in 30
ms since a command is sent
to IHCPU.
A checksum error is detected
10 times in succession.
Power source PWB
1. Confirm that the wiring connector is
firmly connected and, if necessary, con-
nect the connector all the way in.
Power source PWB (YC9) and Feed
PWB 1(YC4)
Power source PWB (YC3) and Fuser IH
PWB (YC1)
2. If the wiring is disconnected, shorted or
grounded, replace the wiring.
3. If the +24V output is not given by the
power source PWB (YC9), replace the
power source PWB.
Feed PWB
1. Confirm that the wiring connector is
firmly connected and, if necessary, con-
nect the connector all the way in.
Power source PWB (YC3) and Fuser IH
PWB (YC1)
2. If the wiring is disconnected, shorted or
grounded, replace the wiring.
3. If the +24V output is not given by the
feed PWB1 (YC27), replace the feed
PWB1.
Fuser IH PWB
1. Confirm that the wiring connector is
firmly connected and, if necessary,
connect the connector all the way in.
Fuser IH PWB(YC4) and Engine PWB
(YC26)
2. If the wiring is disconnected, shorted or
grounded, replace the wiring.
3. Replace the Fuser IH PWB (see page 1-
5-96).
Engine PWB 1. Check the engine software and upgrade
to the latest, if necessary.
2. Replace the engine PWB (see page 1-5-
80).
6960 Current PWB error
The power current is greater
than 1A for 5 seconds contin-
uously despite that 500W was
indicated as the fuser power
during power-up.
(45 ppm/ 55 ppm model only)
Current PWB
1. Confirm that the wiring connector is
firmly connected and, if necessary,
connect the connector all the way in.
Current PWB(YC17) and Feed PWB2
(YC13)
2. If the wiring is disconnected, shorted or
grounded, replace the wiring.
3. Replace the Current PWB.
Code Contents Related parts
Check procedures/
corrective measures