General features

• Load dependent speed regulation
• Designed to run in analog only operation too
• On the fly switching between digital and analog current
• Direction remembered also in analog operation (bistable relay on board)
• Address and features programmable with 6021 or Control 80f (or Intellibox)
• Adjustable starting voltage, acceleration, deceleration and max speed
• 2 function outputs, direction dependent (lights)
• 2 extra functions (with short-circuit protection)
• Dimensions are 26,6 x 16,4 x 6,3 mm (L x W x H)
• Comes with 2 cable sets, one with NEM plug

Electrical Data 

• Motor output max. load: 1 A
• Function output max. load: 200 mA
• Total maximum output 1,2 A
• The function outputs are overload protected, the motor output not.
• The extra functions are controllable with the "new" Märklin-Motorola only.

Address coding 

The loco address is set with a 6021 Control Unit or Control 80f (6036). The procedure is described here, setting the loco address to 21.

• Put the loco on the track (with track power), controller speed set to 0.
   
• Press the rubber button on the decoder (be sure not to short any part of the decoder). When the loco lights are alternately blinking front-rear, the decoder is in programming mode.
   
• Enter the value 01 on the Control Unit.
   
• Press the "Function off" button, make sure the "Function" LED does not shine.
   
• Turn the speed dial on the Control Unit to "reversing" (far left) and release it.
   
• Enter the address with the numeric keys on the Control Unit (1..80), here 21.
   
• Press "Function" ON. Make sure the "Function" LED lights up.
   
• Turn the speed dial on the Control Unit again to "reversing" (far left) and release it. 
   
• Press the "Stop" button on the Control Unit, this makes the track unpowered and the decoder exits the programming mode.
   
• After restoring power to the track (the "Go" button) the decoder should now be reacting to the new address.
   

Further settings:

Following features can also be programmed:

• Starting voltage
• Acceleration
• Deceleration
• Max speed
  

Feature programming:
 
The above features are programmed in the same way as the address programming procedure (loco address=feature 01).

The features are numbered:

• 02 - Starting voltage (value=1..80)
• 03 - Acceleration delay (value=1..80)
• 04 - Deceleration delay (value=1..80)
• 05 - Max speed (value=1..80)

In short, substitute the "01" in the procedure described above regarding setting the loco address with the value of the feature. Repeat the procedure for the selections until you are satisfied with the feature programming.… 
 
If you have an Intellibox, you must enter the values specifically as loco addresses, otherwise the same steps as above apply. 
 
Example for IB - enter the loco address:
 
First the normal steps to put the decoder into programming mode as above.
(IB special specific procedure starts here)
- Press Lok#, enter "01", press the "return" key.
- Press "Function off".
- Press the speed dial for the reverse command.
- Press Lok#, enter the desired address (1..80), press the "return" key.
- Press the "Function" key.
- Press the speed dial for the reverse command.
(IB specific procedure ends here)
Continue with the normal steps...
 

Decoder mounting tips:

Remember to service your loco properly before the conversion, so it is mechanically and electrically ok.  Change broken light bulbs and worn coals/brushes, give the loco mechanical parts a good cleaning session and then lubricate it properly. Give it a test run and verify that it is running smoothly. Then you can eliminate the mechanical problems as much as possible sources of trouble, in case something does not work properly.

And as usual, be sure to work in an antistatic environment, preferably with an antistatic mat and a wrist-band that is connected to ground.
 

Cable colors:

Note - There are two ways of connecting the lights & extra functions, depending of e g bulb socket type

If the lights + extra functions are grounded to the chassis, then attach the white and yellow cable to the respective light (+) lead. 
Then the function return is grounded to the chassis. 

If the lights + extra functions ground is separate from the chassis (floating ground connection), then attach the white and yellow cables to the respective light (+)lead and ground the function return to the blue cable instead. The blue cable must NOT be connected to chassis ground. 

Do not intermix function ground return, it's either one or the other way to connect the leads, i e all functions *must* have the same ground return path. So either use the chassis or the blue cable, *not* both..... 
 

Finally

Test the loco before you mount the body to ensure proper operation, also be careful that metal parts of the body are not in contact with the decoder chip or the cable ends. If the decoder board is shorted, it may very well be destroyed. 

Other

This decoder is now also used as a standard decoder in Roco locomotives, so if your friends ask you how to program their new Roco loco with that "rubber button decoder", just follow the procedure described in this article. Earlier Roco locos for "AC-digital" have the Lenz LE900 aboard, and you can see the description of it here.