Ricoh B205 Service Manual page 186

SERVICE CALL CONDITIONS
Code No.
510 B LCT lower limit error
The lower limit sensor does not activate
within 8 seconds after the tray has been
lowered.
520 B Paper tray error
An error occurs (i.e motor error, or
sensor error, etc) for any paper tray.
541 A Fusing thermistor open
The fusing temperature did not increase
12 °C at the center or ends of the hot
roller within 2 seconds after two checks
from the time the fusing lamps turned
on.
542 A Fusing temperature warm-up error
The fusing temperature does not reach
the standby temperature within 20
seconds after the main switch is turned
on.
543 A Fusing overheat error 1
A fusing temperature over 230°C is
detected for 5 second by the fusing
thermistor.
544 A Fusing overheat error 2
• A fusing temperature over 250°C is
detected by the fusing temperature
monitor circuit in the SBCU board.
• The power was interrupted for more
than 0.3 sec.
545 A Fusing overheat error 3
After warmup, the hot roller attained full
operating temperature and maintained
this temperature for 10 sec. without the
hot roller rotating.
546 A Unstable fusing temperature
The fusing temperature varies 50°C or
more twice in succession within 1 sec.
547 B Zero cross signal detection error
Zero cross signals are not detected
within a certain period.
548 A Fusing unit set error
The machine does not detect the fusing
unit.
557 B Zero cross waveform signal error
The waveform of the zero cross signal
was detected out of range.
590 B Exhaust fan motor error
The CPU detects an exhaust fan lock
signal for more than 3.5 seconds.
B205/B209/D007/D008
Symptom
4-8
Possible Cause
• Tray lift motor defective
• Poor connection of the tray lift motor
• Lower limit sensor disconnected or
defective
• Obstruction that causes overload on
the drive mechanism.
• A defective motor
• A defective sensor
• Obstruction that causes overload on
the drive mechanism
• Fusing thermistor out of its position
because of incorrect installation
• Fusing thermistor disconnected or
defective
• Power supply not within rated range
(15% or more below rating)
• Fusing thermistor defective or out of
position
• Fusing lamp disconnected
• Fusing thermostat open
• TRIAC short on PSU (PSU
defective)
• SBCU board defective
• Fusing thermistor defective
• TRIAC short on PSU (PSU
defective)
• SBCU board defective
• Fusing thermistor defective
• Voltage of power supply unstable
• Hot roller thermistor is out of its
position because of incorrect
installation
• Thermistor disconnected or
defective
• Fusing unit drawer installed
incorrectly
• PSU defective
• SBCU board defective
• Poor connection of the fusing unit
• The fusing unit is not installed
• Electrical noise on the power supply
line
• Poor connection of the exhaust fan
motor
• Too much load on the motor drive
SM