Ricoh FT6645 Manual page 42

23 April 1993
1.4.3 Sensor Abnormal Conditions
a. ID sensor (V
SG
Whenever V falls under 2.5 V or V
SG
V data and toner concentration is controlled only by using TD sensor
REF
output.
V and V are still detected as usual during abnormal conditions and if
SG SP
output returns to normal levels (V
the toner concentration control to normal mode.
b. TD sensor (V
TD
Whenever V rises over 4.0 V or V
TD
toner supply to the fixed supply mode. In this condition, the CPU never stops
the toner supply. The fixed toner supply amount can be changed in four steps
(4%, 7%, 11%, 14%) by using SP mode. The default fixed toner supply
amount is 4%.
V is still detected as usual during the abnormal condition and if its output
TD
returns to a normal level, the CPU returns the toner concentration control to
normal mode.
c. Drum Potential Sensor abnormal
Whenever V rises over 1.6 V or V
100
rises over 5.0 V or V
supply to the fixed supply mode, as for a TD sensor (V
condition.
Related SC codes. (See troubleshooting section of details.):
Code
351 Abnormal V
352 Incomplete TD Sensor Initial Setting
353 Abnormal V
354
Abnormal V
355 Abnormal V
356 Abnormal V
357 Abnormal V
358 Abnormal V
361 Incomplete Drum Potential Sensor Calibration
,V ) abnormal
SP
SG
) abnormal
falls under 2.7 V, the CPU also shifts the toner
800
Detection (V
SG
Detection (V
SP
Detection (V
SG
Detection (V
TD
Detection (V
TD
/V
SP SG
/V
SP SG
rises over 2.5 V, the CPU fixes the
SP
≥ 2.5 V, V ≤ 2.5 V), the CPU returns
SP
falls under 0.5 V, the CPU shifts the
TD
falls under 0.1 V or whenever V
100
Condition
> 4.2 V)
SG
> 2.5 V)
SP
≤ 2.5 V)
SG
> 4 V)
TD
< 0.5 V)
TD
Detection (V /V
SP
Detection (V /V
SP
2-17
PROCESS CONTROL
) abnormal
TD
SG ≥
0.25 V)
< 0.25 V)
SG
800