N Gauge Class 121 and 122
Lighting functions and DCC installation (Revised lighting control boards, 2018 onwards)
Class 121/122 N lighting and DCC guide V1.0
Decoder Factory reset: CV8 = 4 N.B. This will remove the factory setup from your decoder and it will
need to be reprogrammed as described in ‘CV Settings’ below.
Functions available by decoder type:
• 2 function decoders: No. 1 end lamps Headcode box, White and Red operation only
• 4 function decoders: No. 1 and No. 2 end lamps Red/White operation.
• 6 Function decoders: As 4 function decoders plus interior lighting operation.
Decoder output functions:
• F0F – No.1 end white lamps
• F0R – No. 2 end red lamps
• Aux 1 – No. 2 end white lamps
• Aux 2 – No. 2 end red lamps
• Aux 4 – interior light control
CV settings (Dapol Imperium 21 pin 6 function decoder. NMRA standard):
CV33 = 5 CV34 = 6 CV35 = 10 CV36 = 9 CV51 = 24 CV52 = 0
If your controller only allows F2 to operate momentarily:
The default settings of your DCC fitted class 52 model operate best with F2 set as ‘Latching’. Your
control system manual will describe how to change from ‘momentary’ to ‘latching’ mode.
If you prefer to change the operation of the decoder to assign lighting functions to different keys on
your control system please follow the instructions below.
Change the two CVs for the lamps you wish to alter to the values shown under the function key you
require to control those lamps. Please note that if moving functions within the range of F1-F3
additional changes are required. Select along the top, the desired function key and the function to
change down the left side. Program the value reached in to the CV indicated. The decoder fitted to
this model is a Dapol Imperium. Full programming information can be found on our website:
www.dapol.com.
To be controlled by Fx (F1-6)
34 6 10 18 34 66 130
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