Oki OKIFAX 5400 Maintenance Manual page 332

TEL-W2 (option)
CN3
Connected to
HOOK Circuit
CN2
Connected to
NTIF Circuit
DC V-1
Characteristics
Circuit
DB1
~
+
~ -
Rectifier
Figure A3.5.2 Block Diagram of TEL-W2 (option)
Speech IC (IC1)
VL
Side Tone
TIN+
RIN
Adjustment
Return Loss
TIN-
CL
Adyustment
Receiving
Level RPO
Adjustment
Sending
Frequency
TFC
Circuit
R01
Manual Pad
MPAD R02
Adjustment
Automatic
Gain
AGC
Control
Sending
Sending Level
Frequence
Adjustment
Responce
Circuit
+
CN5
Microphone
Receiver