NEC NEFAX 671 Service Manual page 277

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Malfunc-
Malfunction Name
tion Code
Fuser warm up
C0500
error
Fuser temperature
C0510
low
C0520
Fuser overheat
ASIC memory
C1200
abnormal
Polygon mirror
C1300
motor error
Communication
C133B
with option error
C133C
Modem error
ROM checksum
C133D
error
Description
• The voltage of the Thermistor remains low for a prede-
termined period of time when a warm-up cycle is
started.
• The temperature detected by the Thermistor remains
lower than a reference value for a predetermined
period of time for the period of time that begins 5 sec.
after, and ends 9 sec. after, the start of the warm-up
cycle (where the temperature detected by the Ther-
mistor is 80 °C or less).
• The temperature detected by the Thermistor does not
increase for a 3-sec. period or more for the period of
time that begins after the lapse of a predetermined
period of time after the Fusing Roller Heater Lamp has
been turned ON and ends when the lamp is turned
OFF.
• The Fusing Roller Heater Lamp remains ON for a 30-
sec. period or more (except during the period through
which the Main Motor remains energized).
• The temperature detected by the Thermistor remains
lower than the set temperature continuously for a pre-
determined period of time while the fusing temperature
control is being provided.
(The set temperatures are as follows: 140 °C during a
print mode at 600 dpi; 70 °C during the standby
mode.)
• The temperature detected by the Thermistor remains
higher than 235 °C for a predetermined period of time
while the fusing temperature control is being provided.
• An error occurred while writing to or reading the SRAM
on the Control Board (PWB-C).
• The LOCK signal is not detected within a predeter-
mined period of time that begins 1 sec. after the Poly-
gon Motor has been energized.
• No new LOCK signal is detected for a 1-sec. period
that begins 1.5 sec. after the first LOCK signal was
detected.
• The LOCK signal is not detected for a continuous 0.5-
sec. period in a state in which the Polygon Motor runs
stably.
• The LOCK signal remains ON for a continuous 5-sec.
period or more when the Polygon Motor remains deen-
ergized.
• Communication could not be established with the Con-
troller Control Board within 5 seconds while printing.
• A malfunction occurred in the Modem.
• A malfunction occurred in the ROM.
T-15

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