Toner Supply Motor On Time Determinations - Ricoh AFICIO A267 Service Manual

20 September 1999

Toner Supply Motor On Time Determinations

For fixed control mode, the toner supply motor on time is specified by the setting of
SP2-925, and does not vary. The default setting is 200 ms for each copy. The
toner supply motor on time for each value of SP2-925 is as follows.
Value of SP2-925
0
1
2
3
4
5
6
7
For sensor control modes 1 and 2, the toner supply motor on time is decided by the
following factors.
• Vt
• Vref or Vts
• TD sensor sensitivity (coefficient: S, value is 0.4)
There are seven levels for toner supply motor on time as shown below.
Level
(Vts or Vref) < Vt ≤ (Vts or Vref) + S/16
1
(Vts or Vref) < Vt ≤ (Vts or Vref) + S/8
2
(Vts or Vref) < Vt ≤ (Vts or Vref) + S/4
3
(Vts or Vref) < Vt ≤ (Vts or Vref) + S/2
4
(Vts or Vref) < Vt ≤ (Vts or Vref) + 4S/5
5
Vt ≥ (Vts or Vref) + 4S/16 (near-end)
6
Vt ≥ (Vts or Vref) + S (toner end)
7
NOTE: 1) The value of "t" can be changed using SP2-922 (default: 0.6 second)
2) The value of "T" can be changed using SP2-923 (default: 30 seconds)
3) T (30) means that toner is supplied intermittently in a 1/3 duty cycle (1
s on, 2 s off) for 30 seconds
Motor On Time (t = 200 ms)
t
2t
4t
8t
12t
16t
Continuously
Not supplied
Decision
2-49
DEVELOPMENT
Motor On Time (seconds)
t (0.6)
t x 2 (1.2)
t x 4 (2.4)
t x 8 (4.8)
t x 16 (9.6)
T (30); see note 3
T (30); see note 3