schlage L lockset with dead

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The L Series lock can fit into a door prepped for the SCHLAGE K Series with some additional prep as described here.  
K and L trim and parts are not interchangeable. 
SCHLAGE locks are available with the following backsets: Lock Series Lock Type                 ...
Applies to L9090EL/EU, L9091EL/EU, L9092EL/EU, L9093EL/EU, L9094EL/EU, L9095EL/EUThe Schlage electrified L-Series wiring diagram can be found here and the re...
Applies to L9080EL/EU. L9082EL/EU (Discontinued)The Schlage electrified L-Series wiring diagram can be found here and the requirements are listed below. 24VAC or 24VDC (maximum 26V, ...
Click here to show the differences of an installed lockcase between the L9090, L9091, L9092, L9093, L9094, L9095 EL/EU and the L9080 EL/EU
To remove the Schlage L Series from a door reference the appropriate installation instructions found here at https://us.allegion.com/en/home.html
Inside knob and bushing: 09-402 plus design and finishOutside knob: 09-401 plus design and finish
Make sure the lock AA batteries are good. 4.8 VDC or higher.
When in its “Active state”, the mechanical key switch can prevent USB connection. Make sure the lock key cylinder and tailpiece are properly installed.
Make sure the mechanical triangles on the back of the outside escutcheon are aligned properly.  See the installation instructions at www.schlage.com/support Schlage Technical Support.&nbs...
If the Schlage Utility Software pops up a "E201 error", just ignore it, and tap "Device Options" or update your firmware. See 78451  
Make sure the HHD/SUS is set to USB communication by checking the small icon right of the "No Device Connected" message.  The symbol should be a USB symbol when working with USB enable product...
Grade 2 locks are tested and certified to be in compliance with the following ANSI/BHMA Standards: Cylindrical, Bored and Preassembled Locks & Latches 400,000 Certified Cycles ANSI...
Grade 1 locks are tested and certified to be in compliance with the following ANSI/BHMA Standards: Cylindrical, Bored and Preassembled Locks & Latches 800,000 Certified Cycles ANSI/...
Information on low battery threshold and nuisance delay is noted below: New firmware now has improved levels. - These are approximate values/levels which change with measurement meters and measure...
AD400/AD200/AD250 After ADFwPkg 2.17.0 - June 2011 4 Battery Holder New batteries = 6.2 VDC Low battery threshold is 4.7 VDC for SM & MT - and 3.7 VDC for MAG and PROX (USB stops working at 4...
    AD400/AD200/AD250 After ADFwPkg 2.17.0 - June 2011 8 Battery Holder New batteries = 12.4 VDC Low battery threshold is 7.2 VDC Critical battery threshold is 6.9 VDC Coin cell = new/...
CO2004 Battery Holder (ONLY) New batteries = 6.2 VDC Low battery threshold is 4.2 VDC Critical battery threshold is 3.9 VDC Coin cell = new/full is 3.0 VDC, low is 2.8 VDC
CO2504 Battery Holder (ONLY) New batteries = 6.2 VDC Low battery threshold is 4.2 VDC Critical battery threshold is 3.9 VDC Coin cell = new/full is 3.0 VDC, low is 2.8 VDC
  CO200 & CO250 Disable coin cell Nuisance delay and blink, With CO.A.7 and SUS 4.10.2 or newer for CO200 and CO250, you can use the SUS/HHD, under Lock Properties, Edit, to de-select, DISABLE, t...