Oki B 4100 Maintenance Manual page 426

CPU
from PC1
IC2
IOGA
RIINT
from NCU
to Main power supply
(AC ON)
40055101TH Rev.4
R44
CN4
TXDOPE 1 1
2 2
RXDOPE
5 5
OPECHK
PC1-N 13 13
OPERST 4 4
3 3
PSMODE
HUP-N 15 15
14 14
MP/OFF
12 12
Figure A3.3.1 Block Diagram of OPE (operation unit)
OPE (04W) for OKIOFFICE 44/OKIFAX 4100
X'tal
CN1
IC1
MOS CPU
Internal ROM
Eight LEDs
LEDs
KSCAN0
to
KSCAN7
Key switch
matrix
KSENS0
to
KSENS7
DB0
to
DB7
LCD unit
Control signals
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