Ricoh B089 Service Manual page 101

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 (= Vt – (Vref or Vts))
• TD sensor sensitivity (coefficient: S, value is 0.3)
There are seven levels for toner supply motor on time as shown below.
Level
1
0 < ∆Vt ≤ S/16
2
S/16 < ∆Vt ≤ S/8
3 S/8 < ∆Vt ≤ S/4
4 S/4 < ∆Vt ≤ S/2
5 S/2 < ∆Vt ≤ 4S/5
6 4S/5 < ∆Vt ≤ S (near-end)
7
S < ∆Vt (toner end)
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 half duty cycle
(1.5 s on, 1.5 s off) for 30 seconds
SM
Motor On Time (t = 200 ms)
t
2t
4t
8t
12t
16t
Continuously
Not supplied
Decision
2-41
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
B089/B093