Detecting The Ep Cartridge In The Printer; Ep Cartridge Detection - Canon LBP-CX Series Service Manual

PRINT command (PRNT) is transmitted by the
external device.
d. Detecting the EP cartridge in the printer
Figure 3-41 EP cartridge detection
When the EP cartridge is removed from the
printer, the cartridge no longer presses sensor MS8,
and CEMP becomes TRUE. The custom IC sends a
TRUE NO CARTRIDGE signal (NOCRT) to multi-
plexer IC2 l 5-1. Upon detecting this signal at the
multiplexer, the microcomputer (on the DC control-
ler) sets the READY signal (RDY) FALSE to inform
the external device that a malfunction has occurred.
At the same time, the external device receives the
NO CARTRIDGE status over the COMMAND/
STATUS signal (SC) by transmitting a STATUS RE-
QUEST to the DC controller via the COMMAND/
ST A TUS signal (SC).
3-34
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BY CANON INC. CANON LBP-CX SERIES REY.2 JULY 1985 PRINTED 111 JAPAN (IMPRIME AU JAPON)