Engine Control Board (Px4 Pcb) - Oki OKICOLOR 8 Maintenance Manual

2.2

Engine Control Board (PX4 PCB)

NM93C66N-NW
CPU BUS
VIDEO I/F
RESET
GENERAL INPUT PORT
The engine control block (PU) is controlled by the engine control board (PX4 PCB) which consists
of a CPU (MSM65524), general purpose LSI chips, EPROM, EEPROM, pulse motor drivers, and
video memory. (See Figure 2.4.)
(1) CPU
This is an 8-bit CPU (OKI MSM65524) containing the AD converter and controls the whole
system.
(2) General-purpose LSI
This LSI (MB87D113PFV) is provided in the printer engine control block and has controller-
engine video interface, LED interface, motor control, sensor input, video memory control,
main scanning color correction, skew correction, high-voltage power control, and OST-EX2
functions.
41057610TH Rev. 1
ANALOG INPUT
(Heater temperatures and environment humidity and temperature)
EEPROM
MSM65524
(containing AD converter)
VIDEO MEM
HM658512
OSC 28MHz
MB87D
113PFV
Figure 2.4
CPU
ROM
27512
INT
MT DRIVER
MTD2005F
MT DRIVER
MTD2005F
LSI
MT DRIVER
MTD2005F
C HEAD I/F (3.3V)
M HEAD I/F (3.3V)
Y HEAD I/F (3.3V)
B HEAD I/F (3.3V)
PULSE MOTOR x 8
HIGH-VOLTAGE POWER SUPPLY
SERIAL INTERFACE (2 channels)
GENERAL OUTPUT PORT
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