Sharp MX-M550U Service Manual page 349

2. Operational descriptions
A. Outline
Adoption of the rotating toner bottle enables large capacity with a
compact toner bottle size.
When the remaining toner detection sensor in the toner hopper unit
detects no toner, the toner bottle turns to supply toner to the toner
hopper. Following supply, since the sensor detects full or empty
status inside the toner hopper based on a standard quantity of
approximately 150 g of toner, even if the toner cartridge becomes
empty, copying is not immediately suspended because toner inside
the toner hopper is used (approximately 5K/6% print duty docu-
ments).
Toner filling amount
1,430g / 1,650g
B. Composition
Shutter lock pawl
TB holder upper
Toner bottle
CRUM
TH shutter
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
cartridge from the machine, the TB shutter closes.
* 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.
Life with 6% print duty k]documents
72,000 sheets / 83,000 sheets
TB shutter
TB holder lower
TB holder upper
Heat seal
Toner bottle
TB holder lower
CRUM
MX-M700N TONER SUPPLY SECTION K – 2
C. Operation
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.
* 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.