Oki OKIFAX 5400 Maintenance Manual page 290

IC8
Modem
CPU
Figure A3.1.7 Interface between E17 Board and NCU Board
CPU
TXDOPE
RXDOPE
PSMODE
MPREQ
OPERST-N
OPECHK
+5 V
PCI-N
RIINT
ACON
HUP-N
Figure A3.1.8 Interface between E17 Board and OPE (operation unit)
40838301TH Rev.1
E17
S
RP
R
CML
DP
SR
MUTE
PBXE
to OPE
OH2
to OPE
RI-N
E17
CN9 CN1
1
2
3
4
5
6,7
8,9
0 V
13
14
15
NCU
CN6 CN3
S
A8, B8
A4, B4
A6, B6 R
A3
B3
A2
A1
B1, B2
A15
A14
OPE
X'tal
IC1
TXD
RXD
MOS CPU
PSMODE
Internal ROM
MPREQ
IRST
OPECHK
MP/OFF
+5 V
GND
Eight LEDs
LEDs
A3 - 9
Receiving
sensitivity
control
Relay driver circuit
Hook-up signal
detection circuit
Ringing signal
detection circuit
KSCAN0
to
KSCAN7
Key switch
matrix
KSENS0
to
KSENS7
DB0
to
DB7
LCD unit
Control signal
E17