Line Monitor Circuit; Transmit Motor Control Circuit - Panasonic UF-6300 Service Manual

FCK1
FCK2
FSG
CCD
6.2.5

Line Monitor Circuit

The Line Monitor Circuit consists 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.
Line Monitor Signal
(from AGC Circuit)
Buzzer Clock
(from Control Panel Unit)
Buzzer Tone Switch
(from Output Port)
6.2.6

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).
FCK1
FCK2
FSG
Volume
Control
Circuit
(IC21)
Level Control
Circuit
(Q3)
Line Monitor Circuit Block Diagram
192
IC30
86075
FR
-
(IC20, 2)
+
IC3
SHINE
Speaker
Amplifier
(Q4,5)
Speaker