Kyocera Mita KM-4530 Service Manual page 175

2BC/D
Code Contents
C6400 Zero-crossing signal problem
• The main PCB does not detect the
zero-crossing signal (Z CROSS SIG)
for the time specified below.
At power-on: 3 s
Others: 5 s
C7100 Toner sensor problem
• The toner sensor output voltage is
outside the range of 0.5 to 4.5 V dur-
ing copying or in maintenance item
U130.
• The toner sensor control voltage can-
not be set within the range in mainte-
nance item U130.
C7300 Toner hopper problem
• Toner level is not detected when
toner empty is detected.
C7800 Broken external temperature ther-
mistor
• The input voltage is 4.5 V or more.
C7810 Short-circuited external temperature
thermistor
• The input voltage is 0.5 V or less.
1-5-30 1-5-32
Causes Check procedures/corrective measures
Poor contact in Check the connection of connectors CN17
the connector ter- on the main PCB and CN2 on the power
minals. source PCB, and the continuity across the
connector terminals. Repair or replace if
necessary.
Defective power Check if the zero-crossing signal is output
source PCB. from CN2-7 on the power source PCB. If
not, replace the power source PCB.
Defective main Replace the main PCB if C6400 is de-
PCB. tected while CN2-7 on the power source
PCB outputs the zero-crossing signal.
Defective toner Replace the toner sensor.
sensor.
Poor contact in Reinsert the connector. Also check for con-
the toner sensor tinuity within the connector cable. If none,
connector termi- remedy or replace the cable.
nals.
Replace the developer.
Defective devel-
oper.
Defective toner Replace the toner level detection sensor.
level detection
sensor.
Poor contact in Reinsert the connector. Also check for con-
the toner level de- tinuity within the connector cable. If none,
tection sensor remedy or replace the cable.
connector termi-
nals.
Poor contact in Reinsert the connector. Also check for con-
the humidity sen- tinuity within the connector cable. If none,
sor PCB connec- remedy or replace the cable.
tor terminals.
Defective external Replace the humidity sensor PCB and
temperature ther- check for correct operation.
mistor.
Defective external Replace the humidity sensor PCB and
temperature ther- check for correct operation.
mistor.
Defective humidity Replace the humidity sensor PCB and
sensor PCB. check for correct operation.
Remarks