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CONTROL
PANEL
S
D
T
A
A
T
T
A
U
S
DATA
SERIAL
CONTROL
STATUS
DCU
HOST I/O
DATA
CONTROL
PARALLEL
STATUS
–12V
GND
+12V
FROM MECH DRIVER
AC
POWER
120V
240V
50 or 60 Hz
Principles of Operation
BEEPER
S
FROM MECH DRIVER
W
I
T
+5V GND
C
H
FAULT/STATUS
DCU MESSAGE
READY, READ
MESSAGE
MCU
DO–D7
HSC
COM
H
C
S
O
C
M
+5V
+36V
HAMMER
GND
FROM P/S
DRIVERS
–12V
HAMMER
BANK
+36V
GND
POWER SUPPLY
–12V
Figure 2–9. System Block Diagram
MOTOR
CONTROL
FAULTS
SENSE
PM1–PM4
N
N
H
F
H
U
R
A
C
D
S
U
K
L
T
PAPER
SHUTTLE
DRIVE
STEPPER
MOTOR
FAULT
(IL/AIR)
TO HAMMER DRIVER
AND MECH DRIVER
FROM P/S
+36V GND –12V
+5V
MECHANISM
–12V
DRIVER
+12V
FAULT CIRCUITS
GND
PAPER TRANSPORT
DRIVE
SHUTTLE DRIVE
RIBBON DRIVE
P/S CIRCUITS
P
D
S
D
F
O
R
E
R
A
S
I
N
I
U
I
V
S
V
L
T
E
E
E
T
I
O
N
PLATEN
RIBBON
OPEN/
DRIVE
PAPER
DRIVE
OUT/
DC
DC
PAPER
MOTOR
MOTORS
MOTION
BLOWER
ASSEMBLY
FAN
FAN
FAN
TO
DCU
AND
MCU
P
B
M
L
D
R
2–11
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Troubleshooting
