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1 December 1993
6.12 CIRCUIT
CN105-27
24V
[A]
-26
-18
-19
[B]
-20
Common
-21
-22
[C]
-23
Common
CN101-10
5V
-9
[D]
LED Drive
5V
-12
-11
Component
In/Out
Name
Drum Detection
Switch [A]
Drum Rotation
Out
LED (Red) [B]
Drum Rotation
Out
LED (Green) [B]
Drum Rotation
Button (N.C.) [C]
Drum Rotation
Button (N.O.) [C]
Drum Master
Detection
Sensor [D]
Ink Supply
Out
Solenoid [E]
Drum Lock
Out
Solenoid [F]
Ink Detection [G]
Main PCB
CN104-17
CN105-15
CN104-14
CN104-15
24V
CN104-16
CN103-30
FU101
CND
CN104-19
CN104-20
-12V
CN104-21
Main PCB
CN No.
Signal Level
In
105-26
24V
105-18
0V
105-19
0V
24V
In
105-21
In
105-22
0V
In
TP102
0V
24V
104-17
24V
104-18
0V
In
104-20
(TP105)
(Drum Unit Connector)
CN118
-8
-2
-3
-4
-5
-7
-6
-11
[I]
-9
-12
-10
001-1
002-1
GND
(Drum Unit
002-2
Frame)
002-3
-12V
Ink Detection PCB
Description
Signal goes Low when the drum unit is
0V
slid out.
2.8V
Signal goes High when the drum is not
in the home position. (The LED lights
red.)
2.8V
Signal goes High when the drum is in
the home position. (The LED lights
green.)
Signal goes Low when the button is
0V
pressed.
24V
Signal goes High when the main switch
is turned on.
2.5V
The voltage between TP102 and
ground becomes more than 2 volts
when a master is on the drum.
Signal goes Low when the solenoid is
0V
energized.
Signal goes Low when the solenoid is
0V
energized.
Signal goes Low when there is no ink.
-12V
2-76
[H]
[E]
SOL
[F]
SOL
Ink
Detecting
Pin
[G]
001-2
GND
Doctor Roller
Ink
Roller
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Troubleshooting
