Oki OKIOFFICE84 Maintenance Manual page 304

CN2
(1/2)
TEL1
K
S1.1~2
TEL2
CN2
(2/2)
SR
8
7
TEL CN1
CML
1
LINE
AR , AR
1 2
arresters
RL
7
F
F
IC OFF-HOOK
2
Detector
IC D
1
I SW
S1 - 3~6
Ring Detector
C31 R590 C
2
Loop
Current
B
Detection
RL3 MUTE
DB1 IC5 9
3
DP
DC
circuit
4
SW
H
Figure A3.5.2 Block Diagram of WN5
SW
J
S4
Impedance
matching
E
5
NT
T1
C11
A
IC7
RL6
0
MUTE
Q3
S3
CN3
OH2
RI
G
CN15 ~
CN45
S
6
to Modem
Receiving
RP
sensitivity
Adj
R