Detailed Descriptions; New Cru (Aio) Detection; Toner End Detection - Ricoh FAX1120L Service Manual

10 October, 2002

NEW CRU (AIO) DETECTION

6. DETAILED DESCRIPTIONS

6.1 NEW CRU (AIO) DETECTION
The new supply CRU cartridge [A] has a fuse [B] that when detected informs the
machine that a brand-new cartridge has been installed. (Starter CRU does not
have fuse.)
When the new cartridge is installed in the machine, the machine automatically
detects by the fuse that the cartridge is brand-new, and resets the total dot counter
(TOTAL TONER COUNTS) and CRU print counter (CRU PRINTS). If the previous
cartridge was a starter CRU, the CRU STATE would have been set to 1000.
However when a new cartridge is installed, the CRU STATE will be changed to
3000.
[B]
[A]
H911D901.WMF
The fuse will blow opening the circuit just after the CRU was installed.

6.2 TONER END DETECTION

There is no toner end sensor available on the machine. The machine determines
the amount of toner via software in the machine by counting and adding up black
dots as toner consumption.
For example, when the machine prints 5% of black rate chart, 640,720 dots will be
added up.
When the total number of dots reaches a pre-programmed figure (as for toner near-
end), the machine displays "TONER LOW". After another period of dots has bee
counted up, the machine finally displays "TONER EMPTY" (as for toner end), and
the machine stops printing.
You can check the total dot counts from the current AIO in the System Data List in
TECH mode.
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