Your alarm system has an onboard power supply with fuse protection. You say that you know power is on your endstation but not the keypads. you either have a faulty endstation, a cable fault or more likely a blown fuse. You need to ascertain which; therefore, using a DMM (Digital MultiMeter - set to DC Volts 20v range).
1). At the endstation: Meter across the 12v output which the keypads are connected to. You need circa 11.5v-13.8v. if you nave 0v...
2). Check the onboard fuses - replace if blown. Note that fuses blow for a reason. If you replace a fuse and it blows again, you either have a short on one of your cables or a device is drawing too much current .: disconnect your keypad power cables, replace the fuse again and...
3). Check keypad cables for short (/breaks) by metering cable cores while DMM set to a continuity (Buzzer) setting. If no faults found on your cable you may have a faulty keypad.
If you find that your fuses are all ok and that there is no 12v output you probably have a faulty alarm system. If in doubt go to www.nsi.com and look for a local installation company that may be able to help.
Hope this helps
PR SHIELDS, May 2009
