Printronix P9012, Maintenance Manual

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