Toner Supply In Abnormal Sensor Conditions - Gestetner A193 Service Manual

- Toner Supply Motor On Time Calculation -
The toner motor on time is determined by the following factors (point "5" on
the flow chart).
∆V
•
(this is V - V
T T
•
Copy volume counter
•
Paper size
The copy volume counter (C
0: 1-9 consecutive copies have been made with ∆V
1: 10-19 consecutive copies have been made with ∆V
If ∆V
becomes negative at any time (i.e., there is enough toner), the counter
T
(C ) will be reset to 0.
VOL
The toner motor on times are shown below.
0 < ∆V
<= 0.22,
T
C = 0
VOL
0 < ∆V
<= 0.22,
T
C = 1
VOL
∆V
> 0.22,
T
C = 0 or 1
VOL
NOTE: The toner supply amount is 0.1 g for 0.5 seconds

4.5.6 Toner Supply in Abnormal Sensor Conditions

There are two service codes for a TD sensor error. These SC conditions can
be cleared by turning the main switch off and on again. After doing this, the
machine automatically performs the TD sensor initial setting.
1. TD sensor error 1
When the TD sensor output voltage (V
seconds after the TD sensor initial setting has been performed, SC390 will be
generated. Refer to section 7.1.2 for the definition and possible cause.
2. TD sensor error 2
When the TD sensor initial setting is completed, if the TD sensor output
) exceeds the specified range (2 ± 0.2 V), SC393 is generated.
voltage (V
T
Refer to section 7.1.2. for the definition and possible cause.
SM
)
TREF
) is determined as follows:
VOL
Paper Length
< 250 mm
0.5
1.0
1.0
) is less than 0.5 Volts for, 20
T
2-37
PCU (PHOTOCONDUCTOR UNIT)
> 0
T
> 0
T
Paper Length Paper Length
250 - 400 mm > 400 mm
0.7
1.3
1.3
0.9
1.8
1.8
(A193)