Ricoh Aficio FT4027, Service Manual

Page: 524 / 685

6.4 TONER SUPPLY IN ABNORMAL SENSOR CONDITIONS
If any sensor errors occur under detect supply mode, toner supply mode is
changed automatically as shown below.
Error Abnormal Condition
Fallback Toner
Supply Mode
Display on
Operation Panel
ID Sensor
Adjustment Error When ID sensor output
cannot be adjusted to
4.0
±
0.2 V
Fixed Supply Mode None
Abnormal ID Sensor
(V
SP
)
If V
SP
> 2.5 V during
V
SP
detection.
Fixed Supply Mode None
Abnormal ID Sensor
(V
SG
)
If V
SG
< 2.5 V during
V
SG
detection
Fixed Supply Mode
TD Sensor
Adjustment Error When TD sensor
output cannot be
adjusted to 2.5
±
0.1 V
Fixed Supply Mode Manual ID level or
ADS indicator blinks
TD Sensor (V
T
)
Measurement Error
If V
T
> 4.0 V or V
T
<
0.3 V during V
T
detection.
Fixed Supply Mode Manual ID level or
ADS indicator blinks
Drum Charge
Thermistor Error Temperature detected
by the drum charge
thermistor is below 0
°
C
or above 60°C
Fixed Supply Mode None
@
Abnormal Drum
Charge Thermistor
Output Temperature detected
by the drum charge
thermistor is between
0
°
C and 14
°
C
TD Sensor Supply
Mode None
NOTE: No indication is displayed under the "abnormal drum charge
thermistor output" condition, because the machine soon recovers
due to the heat inside the machine.
Over
al
l
Machine
In
fo
rm
a
tio
n
PROCESS CONTROL
SM 1-21 A207/A208/A211