Panasonic UF-6300, Service Manual, Page: 193 / 274

193
6.2.7 Line Control Circuit
The Line Control Circuit consists of CML relay, DP circuit, DAA (Direct Access Arrangement), Ring Detect
Circuit for power-save and DC hold circuit. A Jack for an external telephone, which can be used for either
an external telephone or an optional Handset Kit. The block diagram of the Line Control Circuit is shown
below.
Tx Stepper
Motor
Tx Motor Driver Circuit Block Diagram
SHINE
IC3
Motor
Driver
IC36
+24V
Motor
Driver
IC37
+24V
R371
R370
DP Control
Ringer Signal Detection,
TAM I/F,
DTMF Remote Detection
Off-Hook
Detection
Speech
IC
DAA
Line
I/F
Si3019
(IC23)
DP
Circuit
DC Hold
Circuit
Ring Signal
Detector
for Wake-up
(PC301)
Ringer
IC
+
- ~
~
Hook SW
External
External
Telephone
Telephone
Jack
Connect either one
Line
CML Relay
Optional Handset Kit
+
- ~
~
DAA
Control
I/F
Si3056
MODEM
MMD5020
CPU
IC3
SHINE
PNL
Line Control Circuit
MJR3 PCB
SC PCB
(IC24)