Canon iR C6800 Series Service Manual page 313

<Little Toner Left>
Detection starts
Light emitting
segent
PS25
Light receiving
segent
Counter1(*1) 1
Counter2(*2)
<Much Toner Left>
Detection starts
Light emitting
segent
PS25
Light receiving
segent
Counter1(*1) 1
Counter2(*2)
F-7-42
*1: if the light receiving segment of PS25 receives light, '1'.
*2: if the state of counter 1 is '1' as many as 4 times during a single cycle (5 lighting operations), '1'.
Memo:
If color toner is absent, the user message "Add Toner" is indicated and the printing is stopped.
1 cycle 1 cycle
1 1 1 0 1 1
1
1 cycle 1 cycle
0 0 0 0 0 0
0
1 1 0
1
1 0 0
0
Chapter 7
7-47