Oki Microline 390 Maintenance Manual - page 31
of
174
PROM
128 kbyte
MSM6990
PAPER END SENSOR
SWITCH
DRIVER
CIRCUIT
ADDRESS BUS
CN6
ADDRESSANDDATABUS
CN7
D-RAM
RAM ADDRESS
48 kbyte
CN4
DMA,
HEAD DRIVE
MOTOR
CONTROL
1
(for
MOTOR
0
POSITION
INTERFACE
OPTIONAL INTERFACE
LF MOTOR
0
PRINTHEAD
(WITH BUILT-IN
RATURESENSOR)
(OPTION)
ROM
512 kbyte
POWERSUPPLY CIRCUIT
Figure 3-1 Block diagram