Oki OKIFAX 5950 Series Maintenance Manual page 482

CN2
(1/2)
K
TEL1
S1-1~2
TEL2
CN2
(2/2)
SR
8
TEL
RL
2
CN1
CML
7
RL
1
1
LINE
AR
arresters
P
RL4
PBXE
RL
F
7
IC
2
F
OFF-HOOK
Detector
D
IC
1
J
I
C
1
S1-4 S4-1~2
Ring
L
C31
Detector
L7, L8,
R590
2 C7, C507, C9
Loop
LPF
Current
16 KHz
B
Detection
RL
MUTE
DB1 IC5
3
OH1
DP
4
Figure A3.4.4 Block Diagram of DN5
C
T E
1 5
C
11
S4-3, 4
Impedance
matching
NT
3
A
RL6
9 0
IC7
PP
MUTE
DC IC501
circuit
2/2
N
CN3
OH2
OH1 OH1
RI
G M
IC501
1/2
S
S4-7, 8
6
Receiving
Rp
sensitivity
Adj
S4-5, 6
LPF R
16 KHz
IC502
O
to Modem