Copystar CS-2030 - Ncu Pcb

3B1
2-2-5
2-2-2 NCU PCB
120 V specifications
Loop current
detection/tone
signal reception
circuit IC30
Destination
identification
circuit
JP20, JP21, JP22
DC loop/dial pulse
transmission circuit
PC80
Line
transformer
T70
Ring signal
detection
circuit
PC60
External telephone
off-hook detection circuit
T40, PC40
NCUTYPE
1, 2, 3
K70
K11
K10
/ONHOOK2
/ONHOOK1
RXIN
FAXSEL
MODRXD
MODTXD
SHUNT
PLSDIL
RNGDET
EARTH
DCCONT
/OFFHOOK
EXTRING1
EXTRING2
TELSEL
LINE1
LINE2
TEL L1
TEL L2
220 - 240 V specifications
TEL2
TEL1
Loop current
detection/tone signal
reception circuit IC30
Destination
identification circuit
JP20, JP21, JP22
DC loop/dial pulse
transmission circuit PC80
Line
transformer
T70
Ring signal
detection
circuit
PC60
Accounting
pulse elimination
circuit
L70
Ground start
circuit PC10
External telephone
off-hook detection circuit
T40, PC40
NCUTYPE
1, 2, 3
K70
K11
K10
/ONHOOK2
/ONHOOK1
RXIN
FAXSEL
MODRXD
MODTXD
SHUNT
PLSDIL
RNGDET
EARTH
DCCONT
/OFFHOOK
EXTRING1
EXTRING2
TELSEL
LINE1
TEL GND
LINE2
TEL L1
TEL L2
Figure 2-2-3 NCU PCB block diagram