Panasonic UF-580 / UF-590 / UF-780 / UF-790 / UF-5100 / UF-6000 / UF-6100 / DX-600 / DX-800 Service Manual / Other ▷ View online
17
SEP 2005
Ver 3.0
UF-580/590/780/790
UF-5100/6000/6100
DX-600/800
1.1.6
Line Monitor Circuit
The Line Monitor Circuit consist of an operational DAA (The secondary side chip) and its peripheral
circuits. Its function is to monitor the dial tone, DTMF tone, response signals, etc. over the speaker. It also
sounds the output of the key touch tones, alarm tones, etc. from the panel CPU over the speaker. The
Received Signals are output from DAA of Secondary circuit, and through Analog AGC, Electronic Volume,
Amplifier and over the speaker.
The monitor tone from the phone line and the buzzer tone from the panel can be adjusted from the Control
Panel.
circuits. Its function is to monitor the dial tone, DTMF tone, response signals, etc. over the speaker. It also
sounds the output of the key touch tones, alarm tones, etc. from the panel CPU over the speaker. The
Received Signals are output from DAA of Secondary circuit, and through Analog AGC, Electronic Volume,
Amplifier and over the speaker.
The monitor tone from the phone line and the buzzer tone from the panel can be adjusted from the Control
Panel.
Volume
Control
Circuit
(IC21)
(IC21)
Level Control
Circuit
(Q3)
(IC20, 2)
Speaker
Amplifier
(Q4,5)
Speaker
AGD
(+2.5VDC)
Line Monitor Signal
(from AGC Circuit)
Buzzer Clock
(from Control Panel Unit)
Buzzer Tone Switch
(from Output Port)
+
-
Line Monitor Circuit
Block Diagram
18
SEP 2005
Ver 3.0
UF-580/590/780/790
UF-5100/6000/6100
DX-600/800
1.1.7
Transmit Motor Control Circuit
The transmit motor is a PM type, two-phase bi-polar motor. The stepping signal and chopping current
control signals (pTAPH, pTBPH, pTA10, pTA11, pTB10 and pTB11) are sent to the chopper drive circuit,
comprised of IC36, IC37 and its peripheral circuitry, from IC3 SHINE output port. The motor is powered by
+24 VDC and is driven by a 1/2-phase excitation, and greater step division is provided by controlling the
phase circuit in steps (micro-step control).
control signals (pTAPH, pTBPH, pTA10, pTA11, pTB10 and pTB11) are sent to the chopper drive circuit,
comprised of IC36, IC37 and its peripheral circuitry, from IC3 SHINE output port. The motor is powered by
+24 VDC and is driven by a 1/2-phase excitation, and greater step division is provided by controlling the
phase circuit in steps (micro-step control).
Tx Stepper
Motor
Motor
Tx Motor Driver Circuit Block Diagram
SHINE
IC3
Motor
Driver
IC36
+24V
Motor
Driver
IC37
+24V
R371
R370
19
SEP 2005
Ver 3.0
UF-580/590/780/790
UF-5100/6000/6100
DX-600/800
1.1.8
Line Control Circuit
The Line Control Circuit consist 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.
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.
DP Control
Ringer Signal Detection,
TAM I/F,
DTMF Remote Detection
Off-Hook
Detection
Speech
IC
DAA
Line
I/F
Si3015
(IC23)
DP
Circuit
DC Hold
Circuit
Ring Signal
Detector
for Wake-up
(PC2)
Ringer
IC
+
-
-
~
~
~
Hook SW
External
External
Telephone
Telephone
Jack
Connect either one
Line
CML Relay
Optional Handset Kit
+
-
-
~
~
~
DAA
Control
I/F
Si3021
MODEM
MN195006
CPU
PNL
10MW
Line Control Circuit
MJR PCB
SC PCB
(IC24)
20
SEP 2005
Ver 3.0
UF-580/590/780/790
UF-5100/6000/6100
DX-600/800
Dial Pulse Generator
The Dial Pulse Generator consist of a CML relay, a DC hold circuit, a Dial pulse generating circuit and their
peripheral circuits. The generator generates dial pulses. The CPU on the SC PC Board controls all dial
pulse generation sequences. When the absence of the terminating message is confirmed by the Off-Hook
detector in DAA (IC23), the CPU turns the CML relay ON and the Dial pulse generating circuit ON through
DAA to develop loop status (DC loop). After a few seconds, the CPU turns the PLS relay ON and OFF to
generate dial pulses, making and breaking the loop. The line status during dialing is shown below.
peripheral circuits. The generator generates dial pulses. The CPU on the SC PC Board controls all dial
pulse generation sequences. When the absence of the terminating message is confirmed by the Off-Hook
detector in DAA (IC23), the CPU turns the CML relay ON and the Dial pulse generating circuit ON through
DAA to develop loop status (DC loop). After a few seconds, the CPU turns the PLS relay ON and OFF to
generate dial pulses, making and breaking the loop. The line status during dialing is shown below.
DTMF Tone Generator
The DTMF Tone Generator is incorporated in the MODEM on the SC PC Board. The DTMF tone is
conveyed to the telephone line using the same route as the facsimile signal. The DTMF tone selection is
controlled by the CPU. Digital amplitude signal is conveyed as analog amplitude signal through D/A
converter in the DAA (IC23). The line status during dialing is shown below.
conveyed to the telephone line using the same route as the facsimile signal. The DTMF tone selection is
controlled by the CPU. Digital amplitude signal is conveyed as analog amplitude signal through D/A
converter in the DAA (IC23). The line status during dialing is shown below.
Ring Detector
When the unit is in the Sleep Mode status, a Ringing signal is detected by a photo-coupler (PC2) in the Ring
Detector to cancel the power-save for waking up. Then DAA (IC23) detects the ringing signal for the receive
mode.
When the unit is in the normal operating status, DAA (IC23) detects the ringing signal immediately.
Detector to cancel the power-save for waking up. Then DAA (IC23) detects the ringing signal for the receive
mode.
When the unit is in the normal operating status, DAA (IC23) detects the ringing signal immediately.
CML Relay
Dial Pulse
Generate Circuit
Generate Circuit
Line status
break
make
make
break
Line release
Speech
condition
First
digit
make
break
Pre-pause
Inter-digit
pause
Speech
condition
Speech
condition
Second
digit
CML Relay
Line status
break
make
Line release
Speech
condition
First
digit
make
break
DTMF signal
Signal time
Inter-digit
pause
Speech
condition
Second
digit
Speech
condition
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