Hi. I have an old (circa 1992) Scantronic 9800 alarm system installed with the 9825 keypad. Its been working great for 'ever'. But after a recent mains power failure to the house, the display gave the 'Lb' indication for backup/auxillary battery low on the display. I disconnected the battery and mains power fuse. I have replaced the AUX/backup battery over the years 4 times before without any problems. I have fitted a new 12v lead acid battery today, but now the 7-segment display does not illuminate and the keypad appears to be malfunctioning. I enter 1234 followed by 07890 but all that lights up are the 2 yellow LEDs immediately under the top of the keypad, above the segment displays. The 2 x 7 segment displays, Power, Failure and Service LEDs do not illuminate. After several presses of the keys the sounder beeps for every key press and the yellow LEDs go out. I have checked the keypad is getting full 12v DC from the main panel . The onboard regulator (7805) is giving out 5volts to the 80C49HC controller and 74HC14N chip etc. The tamper switch on the back of the keypad PCB is working OK. I have looked at buying a used 9825 or 9827 keypad from eBay which are over priced. Would anyone happen to have a circuit daigram for the 9825 keypad? or any ideas, suggestions etc on what to check to get this working again. Thanks in advance for any help.
Scantronic 9800 system. Keypad 9825 not working
- Thread starter LRCTech
- Start date
Just replace it ….its not worth messing around with as it’s over 30 years old
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