changing fuses on circuit board

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There is a total of 4 red buttons on the front of the Senior Swing control box. To turn on the display, press and hold any 2 of the 4 red buttons at the same time for approximately 3-5 seconds. Y...
The Von Duprin exit alarm ALK shipped after November 2010 are new style boards and can be identified by the 3 terminal blocks and LED.  Only these ALK will work with 24vdc power supply.
See PCB replacement instructions below. The horn is part of the board and can only be replaced by replacing the entire board.
PCB only for the Alarm Kits prior to June 11th, 2012 is part #650335 and was used in the older 17 & 18 devices, 19, & pre June 2012 24/25's.
This circuit board will NOT work on the updated 24/25 Alarm Kits that released June 11th, 2012.