bad back check

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No, the back plate for 880K-knob trim is the same as for 373L-lever trim. Since 373L is a narrow style trim it require to use the 889 cover plate with this trim.
Some architectural specifications require steel frames to be back-coated with a bituminous coating for corrosion protection or sound control. It is commonly specified to be used in condit...
The valve on the back of a 4041/4040XP closer is a "Back Check Selector Valve" that needs to be turned in on "Parallel Arm" mount applications ONLY. If a 4041/4040XP closer mounted "Top Jamb", or "...
Chexit devices shipped after 8-24-2015 with motor driven:If two pin REX connector cable is plugged into the Chexit module and Module REX LED is OFF, the RX switch is defective and needs to be repla...
Chexit devices shipped prior to 8-24-2015 with solenoid driven:If Chexit device goes into alarm with fast flashing red LED after the rearm time, the RX switch may be out of adjustment or defective....
A 4110 with AVB (advance variable back check) would be recommended. Using a SCUSH (Spring Cush) arm will also help minimize shock to all door hardware.
How to:  What are the steps to adjust a door closer?Facts: All LCN and FALCON door closers will have 3 regulating valves and a spring adjustment.  All closers with a "Delay" feature ...
Verify that the 120VAC is present at the controller (measure 120VAC on the 2 wire gray cable from I/O board to controller -- red/black wires in gray cable). If present, but no lights on the contr...
This method is only available before the first network communication between an Access Control Panel (ACP) and the lock. Do a Level 1 and Level 2 Factory Default Reset (FDR) to remove any previ...
Manually Setting the RS-485 Address This method is only available before the first network communication between an Access Control Panel (ACP) and the lock. Do a Level 1 and Level 2 Factory De...