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Part 4 contains a description of the circuit that transmits AC and DC alarm signals.

1. Alarm Circuit Power Source

Consisting primarily of Q501 and D502, the alarm circuit power source stabilizes 41V output voltage described in Part 2 to
approximately 27V. 

2. AC Alarm Signal Transmission Section

If AC input is detected by the AC voltage detection circuit described in Part 1 (5), Q801 is turned on by secondary side transis-
tor of PC80 being turned on, and a low signal is transmitted to AC alarm output. 
On the contrary, if AC input is not detected, Q801 is turned off by secondary side transistor of PC80 being turned on, and
"open" (open collector output) is transmitted to AC alarm output. 

3. DC Alarm Signal Transmission Section

If 15VPT/41V output is output normally, and output voltage detection transistor Q551/Q550 is on, Q901 is turned on and a DC
alarm output low signal is transmitted. 
If either 15VPT or 41V output is abnormal, Q901 is turned off by transistor Q551/Q550 being off, and DC alarm output "open"
(open collector output) is transmitted. 

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Part 6 provides a description of the overvoltage/overheat protection circuits. 

1. Abnormal State Detection Circuit

The abnormality detection circuit consists of the transistor Q520/Q521 thyristor circuits. 
If power operation becomes abnormal and a signal is transmitted to the abnormality detection circuit, Q521 is turned on, cur-
rent flows to the diode of PC50 and is transmitted to the control circuit of the main converter, thereby shutting down main con-
verter operation. (See Part 2)

2. Overheat Protection Circuit

When temperature inside the power source rises to an abnormal temperature, the resistance of posister PTC540 rises, tran-
sistor Q540 is turned on, and the signals transmitted to the abnormality detection circuit via D542. 

3. Overvoltage Protection Circuit

If voltage of either 15V, 15VPT or 41V output becomes excessively high, the voltage is transmitted to the abnormality detec-
tion circuit via Zener diode D526. 

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Category

Model No.

Description

Main Unit

KX-NCP500UA

Main Unit

Main Processing Card 

IP Convergence Main Processing Card (IPCMPR)

IPCMPR Option Cards

KX-NCP1104XJ
KX-TDE0110XJ
KX-TDE0111XJ
KX-TDA0196XJ

4-Channel VoIP DSP Card (DSP4)
16-Channel VoIP DSP Card (DSP16)
64-Channel VoIP DSP Card (DSP64)
Remote Card (RMT)

Small Free Slot
Physical CO Line Cards

KX-NCP1180X

4-Port Analogue Trunk Card (LCOT4)

KX-NCP1280XJ

2-Port BRI Card (BRI2)

KX-NCP1290CJ

PRI Card (PRI30)

Regular Free Slot
Physical Trunk Card

KX-NCP1188XJ

E-1 Trunk Card (E1)

Physical Extension Cards

KX-NCP1171XJ

8-Port Digital Extension Card (DLC8)

KX-NCP1172XJ

16-Port Digital Extension Card (DLC16)

KX-NCP1173XJ

8-Port Single Line Telephone Extension Card (SLC8)

KX-NCP1174XJ

16-Port Single Line Telephone Extension Card (SLC16)

Other Physical Card

KX-NCP1190XJ

Optional 3-Slot Base Card (OPB3)

OPB3
Other Physical Cards

KX-TDA0161XJ

4-Port Doorphone Card (DPH4)

KX-TDA0166XJ

16-Channel Echo Canceller Card (ECHO16)

KX-TDA0191XJ

4-Channel Message Card (MSG4)

KX-TDA0192XJ

2-Channel Simplified Voice Message Card (ESVM2)

KX-TDA0194XJ

4-Channel Simplified Voice Message Card (ESVM4)

Cell Stations (CSs)

DECT

KX-TDA0141CE

DECT 2-Channel Cell Station Unit Using a DHLC/DLC Card (PT-interface CS) for
DECT Portable Station 

KX-TDA0158CE

DECT 8-Channel Cell Station Unit Using a DHLC/DLC Card (PT-interface CS) for
DECT Portable Station

Proprietary Equipment

KX-T30865X

Doorphone

KX-T7765X