Kyocera TASKalfa 7002i Service Manual page 1346

Step Check description
5 Replacing the engine PWB The engine PWB is faulty.
F278: Secondary power source error
The operation became unstable since the primary supply power dropped out temporarily and recovered.
Step Check description
1 Resetting the main power
2 Checking the connection
3 Replacing the LVU
Assumed cause
Assumed cause
The power reset was per-
formed immediately.
The connector is not prop-
erly connected or the wire
is faulty.
The LVU is faulty.
7-486
Measures
Replace the engine PWB.
Measures
Remove the original and
check the sensor. Next, turn
off the power switch and main
switch. Then, turn on the
main switch and power
switch when passing 5 sec-
onds.
Clean the connectors on the
LVU and reinsert the wire
connectors. If there is no con-
tinuity, replace the wire.
Replace the LVU.
2WA/2NJ/2RK
Reference
Replacing
the engine
PWB
Reference
Detaching
and Reat-
taching the
LVU