Canon multipass c3000 Service Manual (en)

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8.2 Connector Name and Signal Descriptions
SCNT board
Connector name Connected to
Description
J21
Operation panel unit Connects to Operation panel unit.  Performs
keyinput data exchange and LCD data exchange.
This also includes document sensor and document
edge sensor signals.
JCNTR1
Host (PC)
Centronics connector for parallel connection to host.
JCS1
Contact sensor
Connects between scanning section and contact
sensor.  Its purpose is to drive voltage for the
contact sensor, and to receive image signals.
JNCU1
NCU board (J1)
Conducts data exchange of data signals with NCU
board, after modulation by the MODEM IC, and
before demodulation.  Also transmits control signals
for the relays.
J14
PCNT board (J5)
See PCNT board (J5).
J15
PCNT board (J6)
See PCNT board (J6).
J16
NCU board (J3)
See NCU board (J3).
J17
Extension telephone
Connects to Extension telephone.
J18
Telephone line
Connects to Telephone line.
NCU board
Connector name Connected to
Description
J1
SCNT board (JNCU1) See SCNT board (JNCU1)
J2
Shield plate
Earthing connector
J3
SCNT board (J16)
Performs data exchanges between SCNT board of
suitable signal levels for the telephone line.
J4
N.C.
Reserved
PCNT board
Connector name Connected to
Description
J1
BJ cartridge and
Connector for BJ cartridge and Home position sensor.
Home position sensor In addition to exchange of print data and BJ head
temperature detection signals, also includes BJ
cartridge detection and type identification signals.
J2
Carriage motor
Supplies drive voltage for the carriage motor.
J3
Line feed motor
Supplies drive voltage for the line feed motor.
J4
Power supply unit 
Input connector for DC voltage converted by the
PSU.  +5V and +24V voltages are supplied.
J5
SCNT board (J14)
Supplies +5V voltage for the SCNT board and
Centronics interface signal.
J6
SCNT board (J15)
Supplies +24V voltage for the SCNT board and
receives control signals for the document feed motor
and printer control signal.
J8
Ink detection sensor
Receives detection signals from the ink detection
sensor.
J9
Document feed motor Provides drive voltage for the document feed motor.
J10
Speaker
Connects to speaker.
Part 1: Facsimile
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