AR-M550 (serv.man12). (6b) Laser scan unit, Image process section, Scanner section, Fusing section, SPF section - Sharp Copying Equipment Service Manual (repair manual). Page 7

AR-M550/M620  DETAILS OF EACH SECTION  6 - 66

The toner cartridge is composed of the toner bottle with toner filled in it,
the TB holder lower which holds the toner bottle and to which the
CRUM and the waste toner box assembly are attached, and the TG
holder upper.

The TB holder lower is attached to the TB shutter. When inserting it to
the machine, the toner hopper rib releases the shutter lock pawl, and
opens in linkage with the TH shutter. When removing the toner car-
tridge from the machine, the TB shutter closes.

NOTE: The toner discharge port of the toner bottle is sealed by the

heat seal. Do not rotate the toner bottle manually, or the heat
seal is dismantled and toner is discharged from the TB shutter
port.

The toner remaining quantity sensor in the toner hopper detects the
toner remaining quantity by the toner stirring roller rotation. When there
is little toner, the toner bottle rotating motor of the machine is rotated.
The toner bottle rotates at 4.2rpm. Toner of about 54g is supplied to
the toner hopper for every rotation. When toner full is not detected after
detecting the state with little toner for a certain period (4min), the toner
cartridge is judged as empty, and the display to urge toner cartridge
replace is shown on the operation panel.

NOTE: When the power is turned on for toner hopper replacement or

cleaning, the toner cartridge replacement display is shown
though toner is not accumulated enough in the toner hopper.
In such a case, turn off/on the power again.

Shutter lock pawl

TB holder upper

Toner bottle

Toner bottle

TB shutter

TB holder lower

CRUM

CRUM

TH shutter

TB holder upper

Heat seal

TB holder lower