Ricoh Robin Service Manual page 59

TONER DENSITY DETECTION AND TONER SUPPLY
6.7 TONER END CONDITION
The image density sensor is used to detect a toner end condition in both
detect and fixed supply modes.
6.7.1 Near Toner End Condition
When the Vsp/Vsg x100 becomes greater than 15.2, the toner density
detection cycle changes from every 10 copies to 5 copies. When this
condition is detected again, the toner supply ratio becomes two times the
amount of toner supply level 4 (Toner supply ratio = 60%, ID sensor data =
348). Then, when this condition is detected five times consecutively, the CPU
determines that there is a near toner end condition and starts blinking the
Add Toner indicator.
6.7.2 Toner End Condition
After the Add Toner indicator starts blinking (Near Toner End Condition), the
operator can make 50 copies. If a new toner cartridge is not added within that
50 copy interval, copying is inhibited and a toner end condition is determined.
In this condition, the Add Toner indicator lights and the Start indicator turns
red.
Example: (Detect Mode)
Toner density
Copy number
detection cycle
1st∼5th copies
6th copy
6th∼10th copies
11th copy
11th∼15th copies
16th copy
16st∼20th copies
21st copy
21st∼25th copies
•
•
•
•
71st copy
Vsp/Vsg
x 100
1st copy 15.3
15.3
15.3
15.3
15.3
• •
• •
• •
• •
— —
2-40
Toner supply
ratio
(If SP31=0)
30%
60%
60%
60%
Add Toner indicator starts
60% blinking.
(Near toner end condition)
•
•
Add Toner indicator blinks.
•
(Near toner end condition)
•
Add Toner indicator lights.
—
(Toner end condition)
24 June 1994
Indicator