Kyocera TASKalfa 7002i Service Manual page 1282

C6770: IH low power error
The IH PWB detects 60% or less of the set power value for 120ms after the fuser heating starts.
Step Check description
1 Checking the connection
2 Changing the input power
3 Replacing the LVU
4 Firmware upgrade
5 Replacing the engine PWB The engine PWB is faulty.
6 Replacing the feed PWB
7 Replacing the IH PWB
8 Replacing the IH unit
C6910: Engine firmware unexpected error
1. The engine stable control continued for one hour. 2. The feed motor does not drive when passing 3s or
more while the drum motor or developer motor is driving. 3. The only high voltage remote signal turned on
while the drum is stopped. 4. The main charge bias turned off while the developer bias turned on.
Step Check description
1 Resetting the main power
Assumed cause
The connector is not prop-
erly connected. Or, the
wire is faulty.
The input power is
improper.
The LVU is faulty.
The firmware is not the lat-
est version.
The feed PWB is faulty.
The IH PWB is faulty.
The IH unit is faulty. (The
coil is broken.)
Assumed cause
The power startup delays.
7-422
Measures
Clean the terminal of the fol-
lowing wire connectors and
reconnect the connectors. If
there is no continuity, replace
the wire. • IH unit - IH PWB?•
IH PWB - Engine PWB?• IH
PWB - Feed PWB?• IH PWB
- LVU
Change the input power.
Replace the LVU.
Upgrade the engine firmware
to the latest version
Replace the engine PWB.
Replace the feed PWB.
Replace the IH PWB.
Replace the IH unit.
Measures
Turn the power switch and
the main power switch off .
After 5s passes, turn the
main power switch and the
power switch on.
2WA/2NJ/2RK
Reference
Wiring dia-
gram
Detaching
and reat-
taching the
LVU
Firmware
Update
Detaching
and reat-
taching the
engine
PWB
Detaching
and reat-
taching the
fuser IH
PWB
Detaching
and reat-
taching the
IH unit
Reference