Post by HurricaneFec on Jul 26, 2013 12:25:10 GMT -8
I have 3 FEC units that that are wired wrong from the manufacture and I would like to bypass the circuit board so I can get the head lights and ditch lights to work separately. I remove the shell and I discovered the led comes on for the top head light but the head light is located on the front hood of the locomotive. My sound decoder has 6 outputs, any suggestions?
Post by Tunnelmotor on Aug 14, 2013 5:34:42 GMT -8
You'l be better off completely junking the MTH board and starting over. That's what I done after fitting a Tsunami into an MTH SD70ace. Be aware also that the small PCB's at front and rear used to power the surface mount ditch LED's and headlights are also wired 'reverse' in these models. By reverse I mean that they are switched by the common's not the negatives. You'l notice the your new decoder has one common to power all the loco's functions and a bunch of negative function leads that are switched. MTH light boards are no good in their current configuration. Ive some pictures of the modification I made to these PCB's if it helps.
You'l be better off completely junking the MTH board and starting over. That's what I done after fitting a Tsunami into an MTH SD70ace. Be aware that the small PCB's at front and rear used to power the surface mount ditch LED's and headlights are also wired 'reverse' in these models. Ive some pictures of the modification I made to these PCB's if it helps.
Thanks any pics will help. I completely Toss the circuitboard it serves no purpose and I know I said I was going to post pics but My garage feels like a slow cooker here in the state of Florida
Post by Tunnelmotor on Aug 14, 2013 6:32:25 GMT -8
The first picture is the front light board before any modification. The second picture is after modification. Note the cut tracks that ive outlined in white and the new polarity markings in blue and red. There's also a new jumper on there.
Post by Tunnelmotor on Aug 14, 2013 6:35:45 GMT -8
In the second picture you'll notice that the brown is now common and the orange and violet are switched functions from the decoder, in this case the number board and head lights. The above is a general over view of the mahem these models create. Its not an easy job, you'll need to take your time with it. I had to mill some of the frame to get the Tsunami 710G to fit. I also completely renewed the ditch lights on 3 of mine using new LED's and housing's.
Post by Tunnelmotor on Aug 14, 2013 6:50:17 GMT -8
The next part is entirely optional, I take no credit for it as it was done by some guy before me, I just copied what he done. This is alot of work make no mistake! First shows how I wired up the new ditch lights. Next is the re-worked stanchions and details west DL housings. The new stanchions came from some old Kato unit I had. And testing the brightness........... Frame is sat on top of UP 1983 already converted. I think I used a 1k ohm resistor across both, not the recommended method but it all works OK a year on!
Post by HurricaneFec on Aug 17, 2013 6:39:46 GMT -8
Plan B, I've decided to use the Loksound direct select decoder that I pulled from my SD80mac for simpler wiring. I going to mailed it back to ulrichmodels.com/ to upload the SD70M-2 sound profile. Comparing the two pics it's a lot easier to use the select board
I remove the Led for the front Head light since the front head light is located on the nose and not by the number board
Post by HurricaneFec on Aug 17, 2013 6:56:09 GMT -8
Someone online put me on to these guys for LED's www.modeltrainsoftware.com/smd-chip-leds.html , their cheap, come with resistors installed and they pretty quick, I ordered twice from them and I received my LED's in 3 day using USPS