Ricoh M126 Service Manual page 32

1.4.3 CONTROLLER AND ENGINE BOARD CONNECTOR PIN
VALUES

The connections listed below are located on the controller board or the engine board. The
comments column lists which board the connection appears on.
These values were measured with all connections made (plugged) or with only one connector at a
time unplugged to expose the pins. Always disconnect and connect with the printer power off.
Otherwise, the values below may not match.
Connector Pin No.
1, 3, 5, 7, 9,
11, 14
10
J8
12, 13
2, 4, 6, 8
10, 12, 14
J16
10, 12, 14
1, 4 ,7
J7
1
4
J99
3
1
J4 1
2
SM
Value cable
Value cable
unplugged (if
plugged
different)
Signals
5 V dc
3.3 V dc
Ground
+5V
Ground
+5V
Ground
+3.3V
Ground
Ground
1.7 V dc
3.3 V dc
1-7
Main Boards
Connection
Modem <-> Controller
Board
ISP <-> Controller Board
Cave light <-> Controller
board
Controller cooling fan <->
Controller board
Cartridge <-> Engine
Board
(The front access door
must be closed.)
M126/M127/M128