Display Trouble Led Illuminated, Piezo Sounding Steadily, And Ac Led Flashing; Short Circuit From A Control Module Or Xpc Point; Open Circuit From A Control Module Or Xpc Point - Pittway NOTIFIER AM2020 Troubleshooting Manual

Display Trouble LED is
Constantly Illuminated,
Piezo Sounder is Soun
ing Steadily and the AC
Power LED is Flashing
Slowly.
Short Circuit From a
Control Module or XPC
Point.
Open Circuit From a
Control Module or XPC
Point.
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If the symptoms at the left exist, it could be an indication of a power supply
problem.
Corrective Action:
1) On the MPS-24A Main Power Supply, with the main power harness that
connects the MPS-24A to the ICA-4L (part number 71030) plugged in,
measure with a voltmeter either Plug P2 or P4, pin 1 (-) to pin 8 (+).
Common (Pins 1-4)
5 VDC (Pin 8)
Original MPS-24A
Figure 2-11: The Upper-Right Corner of the MPS-24A
2) The voltage reading should be 5.0 VDC. If this voltage reading is below 4.7 or
above 5.25 VDC, replace the MPS-24A.
3) Record the software EPROM numbers from the CPU, each LIB, SIB, and DIA
and contact the Notifier Technical Service Representative for further instruc-
tion.
This is caused by a short circuit in the wiring of either a Control Module or an
XPC point.
Corrective Action:
1) Check field wiring.
2) Check the style of the field wiring (Style Y or Z).
3) Remove field wiring and place ELR on screw terminals.
4) Check Type I. D.
5) Replace module or XPC card.
This is caused by an open circuit on the NAC of either a Control Module or an
XPC point.
Corrective Action:
1) Check field wiring.
2) Check the style of the field wiring (Style D or B).
3) Remove field wiring and place ELR on screw terminals.
4) Replace module or XPC card.
AM2020/AFP1010 Troubleshooting Guide 50432 Revision A 8/13/97
firealarmresources.com
24 VDC (Pin 7)
Common (Pins 1-4)
Revised MPS-24A
24 VDC (Pin 7)
5 VDC (Pin 8)
13