Canon Super G3 Fax Board-J1 Service Manual page 23

CHAPTER 2 BASIC OPERATION
G3 fax control PCB (J104) ¬ ®Composite power supply PCB (J124), Off-hook de-
J104 J124/J715signal
1 - GND4
2 - +12V
3 1(J124) GND0
4 2(J124) GND0
5 3(J124) +3.3V
6 4(J124) +3.3V
7 5(J124) GND3
8 6(J124) +3.3VS
9 7(J124) GND2
10 8(J124) GND2
11 9(J124) +5V
12 10(J124) +5V
13 1(J715) +5VS
14 1(J715) GND1
G3 fax control PCB (J105)¬ ®Relay connector to speaker
J105 SPK signal
1 1 SPKR1
2 2 SPKR2
NCU PCB (J3)¬ ®Modular PCB (J911)
J3 J911 signal
7 1 T1
6 2 T2
5 3 NC
4 4 L1
3 5 L2
2 - -
1 - -
NCU PCB (J4)¬ ®Off-hook detection PCB (J714)
J4 J714 signal
1 1 VH
2 2 OVH
2-8
COPYRIGHT © 2001 CANON INC.
tection PCB (J715)
Description
not used
not used
3.3V digital ground
3.3V digital ground
3.3V power supply (at time of ESS, OFF)
3.3V power supply (at time of ESS, OFF)
3.3VS digital ground
ESS 3.3V all-time drive power supply
5V digital ground
5V digital ground
5V power supply (at time of ESS, OFF)
5V power supply (at time of ESS, OFF)
ESS 5V all-time drive power supply
5VS analog ground
Description
Speaker output
Speaker output
Description
not used
not used
not used
telephone line connection
telephone line connection
not used
not used
Description
off-hook detection power supply
ground
2000 2000 2000 2000 CANON SUPER G3 FAX BOARD-J1 REV.0 JUNE 2001