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Discussion Starter · #1 ·
Ebay buy. Advertised as "Brand New", and they appear to be. Out of the box I replaced the cracked gears - and 2 of the 4 were.

DCC ready.

Installed Digitrax DZ126PS decoders in both. B unit runs fine. A unit... see video link below. That is with wide open throttle.

I reset the decoder (set CV8 to 8). No change. I switched the decoders between units. No change.

I took the decoder out and put the DC plug back in the socket. When I applied power from an MRC Tech 4 DC transformer the motor runs as you would expect - wide open at wide open throttle.

Dubya tee H ?

 

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Discussion Starter · #3 ·
Update:

I tried two other, different decoders in the A unit. It moved a little faster, but still nowhere near like it should.

In the DC test I mentioned in the OP I had the loco chassis up on blocks. So I thought, "Maybe there's something wrong with the drivetrain." I put the DC plug back in the socket again and setup a DC test track. It runs great.
 

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Maybe some trouble on the electronics board itself where the decoder plugs in. Can you swap the electronics between the two and check again with the decoder installed?
 

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Discussion Starter · #5 ·
My thinking also. Going to take off the PCB tonight and see what I can see.
 
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