Specifications

If this condition is detected by the CPU two times consecutively, the Add
Toner indicator starts blinking.
After the indicator starts blinking, 50 copies can be made. If a new toner
cartridge is not added within that 50 copy interval, the Add Toner indicator
stops blinking (stays on) and copying is inhibited. If the main switch is turned
off and on after this, only 1 copy can be made each time.
The toner end condition is normally detected by the mechanism described
here. However, it can also be detected using the ID sensor. The Add Toner
indicator will start blinking in the following cases:
Black Development Unit: If Vsp exceeds 1/4 Vsg 10 times in a row.
Color Development Unit: If Vsp/Vsg exceeds 1.1 x threshold level 10
times in a row. The threshold level is the
average of Vsp x Vsg, which is calculated and
stored in RAM when the color developer initial
setting (SP mode #10) procedure is
completed.
When Vsp exceeds 1/4 Vsg in the black development unit, the CPU checks
toner density every 5 copy cycles instead of every 10 copy cycles.
When the toner cartridge is replaced and the front cover is closed, the CPU
turns on the main motor, the development clutch solenoid, and the toner
supply clutch solenoid for approximately 3 seconds to supply toner to the
empty toner supply unit from the toner cartridge. A toner end check is also
done during this 3 second period. The CPU performs this operation a
maximum of 3 times (9 seconds) to clear the toner end condition.
6.10 TONER SUPPLY UNIT INITIAL SETTING (SP mode #63)
When a brand-new machine is installed or the toner supply unit is replaced
with a new one, the toner supply unit initial setting (SP mode #63) must be
performed to prevent the CPU from falsely detecting toner end.
When SP mode #63 is performed, the CPU turns on the main motor, the
development clutch solenoid, and the toner supply clutch solenoid for
approximately 3 seconds to supply toner to the empty toner supply unit from
the toner cartridge. A toner end check is also done during this 3 second
period. The CPU performs this operation a maximum of 3 times (9 seconds)
to clear the toner end condition.
1 December 1990
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