Sub-Hopper Toner Empty Detection Mechanism - Minolta Di 620 Manual

1155SBM1106A

11-6. Sub-hopper Toner Empty Detection Mechanism

Detection is effected by a magnet that rotates together with the sub-hopper's toner
agitation lever. When toner falls to a low level, the magnet will pass close to switch
Sub-hopper Toner Empty Switch on each rotation, causing the switch to go repeat-
edly ON and OFF.
While the toner is above a certain level (the "near-empty" level), the magnet is
pushed upward and inward (relative to the lever) as it hits the toner on the down-
ward rotation. This keeps the magnet relatively distant from the Sub-hopper Toner
Empty Switch, so that the switch does not activate.
When toner falls to the "near-empty" level, the magnet comes close to the Sub-hop-
per Toner Empty Switch on each downward rotation and then moves away on each
upward rotation, causing the Sub-hopper Toner Empty Switch to go repeatedly ON
and OFF. Continuation of this ON/OFF pulse for a period of 60 seconds causes the
copier to recognizes a "toner near-empty" condition. The copier will then generate a
"toner empty" condition less than T/C 3% ratio copies after the "near empty" condi-
tion is recognized.
Toner Present
Sub-hopper Toner Agitation Lever
Sub-hopper Toner
Empty Switch (S7)
CONTROL SIGNAL
S7
Magnet
1075M061AA
PJ8A-12B
M-61
Toner Empty
Sub-hopper Toner
Empty Switch S7: ON
ON OFF
L H
1075M062AA
WIRING DIAGRAM
D-4