Detecting The Toner Level And Controlling The Toner Supply Mechanism - Canon iR7086 Series Service Manual

Chapter 7
When '1', high-voltage
output is ready.
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2
3
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5
6
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9
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12
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Voltage input between 0 and 12 V,
used to control the voltage level
of the developing DC bias.

7.7.5 Detecting the Toner Level and Controlling the Toner Supply Mechanism

iR7105 / iR7095 / iR7086
The following shows the components associated with the machine's toner supply control system:
Sub hopper toner sensor (TS4)
Purpose: to keep the toner inside the sub hopper to a specific level.
Operation: upon detection of the absence of toner, the machine rotates
the toner feedscrew inside the sub hopper to supply toner to the buffer.
Toner sensor TS1;inside the buffer
Purpose: To keep the toner inside the hopper to a specific level.
Operation: If the absence of toner is detected, the toner feeding screw
inside the sub hopper is rotated to supply the buffer with toner.
Developing assembly toner sensor TS3
Purpose: to keep the toner inside the developing assembly to a specific level.
Operation: upon detection of the absence of toner, the machine rotates the magnet
roller to supply toner to the developing assembly.
7-22
J510A J723
J721
18
17
0 V
16
HVDC_REMOTE
15
14
13
12
11
10
DEV_AC_ON
9
DEV_DC_CNTR
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7
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5
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3
2
1
When '1', the developing
AC bias is generated.
Relay PCB
AC output: 1200 Vpp
1 2 3 4
J732
The developing DC bias varies as follows
according to the potential of DEV_DC_CNTR:
F-7-29
Toner bottle
Buffer toner lower limit sensor TS2
Purpose: to detect the absence of toner inside the buffer.
Operation: upon detection of the absence of toner,
the machine stops the ongoing operation, and
Magnet roller
indicates a message to that effect.
F-7-30
Developing cylinder
500V
Image area
Non-image
area
3V
11V 12V
DEV_DC_CNTR
Sub hopper
0010-8067