Kyocera TASKalfa 620 - Page 185

2KN/2KP
1-4-41
C6400 Zero-cross signal error
• The engine PWB does not detect the
zero-crossing signal (Z CROSS SIG)
for 5 s.
Poor contact in the
connector termi-
nals.
Check the connection of connector YC11 on
the engine PWB and YC6 on the DC power
source PWB, and the continuity across the
connector terminals. Repair or replace if
necessary.
Defective DC
power source
PWB.
Check if the zero-crossing signal is output
from YC6-3 on the DC power source PWB.
If not, replace the DC power source PCB.
Defective engine
PWB.
Replace the engine PWB if C6400 is
detected while YC6-3 on the DC power
source PWB outputs the zero-crossing sig-
nal.
C7200 Broken internal thermistor wire
• The thermistor output value is 4.5 V or
more.
Poor contact in the
connector termi-
nals.
Check the connection of connector YC23 on
the engine PWB and the continuity across
the connector terminals. Repair or replace if
necessary.
Defective develop-
ing humidity sen-
sor.
Replace the developing humidity sensor.
Defective engine
PWB.
Replace the engine PWB.
C7210 Short-circuited internal thermistor
• The thermistor input value is 0.5 V or
less.
Poor contact in the
connector termi-
nals.
Check the connection of connector YC23 on
the engine PWB and the continuity across
the connector terminals. Repair or replace if
necessary.
Defective develop-
ing humidity sen-
sor.
Replace the developing humidity sensor.
Defective engine
PWB.
Replace the engine PWB.
C7300 Toner hopper problem
• During toner replenishment after toner
empty has been detected, toner empty
could not be cleared in 3 times of
360 s.
Defective toner
level detection sen-
sor.
Replace the toner level detection sensor.
Poor contact in the
toner level detec-
tion sensor con-
nector terminals.
Check the connection of connectors YC2
and YC5 on the deck PWB and YC3 on the
engine PWB. Reinsert the connector. Also
check for continuity within the connector
cable. If none, remedy or replace the cable.
C7800 Broken external thermistor wire
• The thermistor output value is 4.5 V or
more.
Poor contact in the
connector termi-
nals.
Check the connection of connector YC13 on
the engine PWB and the continuity across
the connector terminals. Repair or replace if
necessary.
Defective humidity
sensor.
Replace the humidity sensor.
Code Contents
Remarks
Causes Check procedures/corrective measures