Canon MultiPASS C50, Service Manual

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The electrical section is composed of the following: the SCNT board, which performs system control; the
NCU board, which is the interface with the telephone circuit; PCNT board; which performs BJ printer
control; the power supply unit; and the OPCNT board, which detects key operations and displays status
information. There are also 6 sensors to detect system status.
Part 1: Facsimile
2-2
Paper edge sensor:
Detects the state of paper
feeding and delivery.
Pickup roller sensor:
Detects the state of
pickup roller.
Home position sensor:
Detects the carriage position
and purge unit status.
Document sensor:
Detects whether or not
a document is set.
Document edge sensor:
Detects the trailing edge
of the document.
Ink detect sensor:
Detects ink fired from the
BJ head,in order to
detect when the BJ cartridge
runs out of ink.
OPCNT board
Power supply unit
PCNT board
SCNT board
NCU board
Figure 2-2 Electrical System Layout