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desertdrover
Engineer
USA
11332 Posts |
 Posted - 02/19/2011 : 7:52:30 PM
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I've got an HO Climax PC board that fried two resistors. Bachmann doesn't have replacement boards and can't help me out here. I'd like to try and replace the burnt resistors, but have no idea what size or type they are. Foreign I'm sure buy the colors. The picture shows the two that are burnt in the center of the board. Any ideas out there on what these are?
I was running it on my Digitrax system address 00 when they fried.
If all else fails, I'll just have to rewire the thing with a DCC decoder. Thanks for helping with your thoughts on what these are.
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 Louis
Pacific Northwest Logging in the East Coast |
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visman48
Fireman
USA
4505 Posts |
Posted - 02/19/2011 : 8:26:15 PM
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Louis,
Have you checked with Bachmann for a replacement board? I am begining to think one of a friends loco has the same problem, and may result in a direct rewire too. I like the ease in just plugging the decoder into the board..but there is something freaky about this specific board. I would also expect our electrical gurus to say what kind of resistor it is...not standard markings? for id?
Les |
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halrey
Engine Wiper
USA
122 Posts |
Posted - 02/19/2011 : 9:24:51 PM
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Louis,
Well today is your lucky day! I have 4 of those Climaxes and one is a total loss, all but the PC board, I plan to use the remains of the engine for a wreck scene at some point, and it doesn't need the PC board for that. You are welcome too it if that helps you out...
Hal Reynolds
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desertdrover
Engineer
USA
11332 Posts |
Posted - 02/20/2011 : 11:08:22 AM
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quote:
Originally posted by halrey
Louis,
Well today is your lucky day! I have 4 of those Climaxes and one is a total loss, all but the PC board, I plan to use the remains of the engine for a wreck scene at some point, and it doesn't need the PC board for that. You are welcome too it if that helps you out...
Hal Reynolds
Hal, you are the Man! I'd be glad to pay you for it. I'll give you a PM. Many thanks. [:-thumbu]
Les to answer your question, I had contacted Bachmann and they do not have replacement boards, and stopped making that type of board. |
Louis
Pacific Northwest Logging in the East Coast |
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simon1966
Fireman
USA
2861 Posts |
Posted - 02/20/2011 : 12:05:01 PM
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| Louis, I have heard plenty of anecdotes about burning up motors when running on 00 (DC simulation mode) but this is the first time I have seen actual photos! It looks like the resistors acted as a fuse? I wonder why they got so hot? Since you run DCC, why not just hard wire a decoder anyway? Removing that board would give you a lot more room for it. |
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closetguy
Fireman
USA
1321 Posts |
Posted - 02/20/2011 : 7:08:14 PM
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Hi Louis
the colors on the resistors are in this order. Yellow.. Blue....Gold ...silver. obviously a non standard resistor. |
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closetguy
Fireman
USA
1321 Posts |
Posted - 02/20/2011 : 7:35:59 PM
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This should help
Mike M |
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desertdrover
Engineer
USA
11332 Posts |
Posted - 02/20/2011 : 7:57:44 PM
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quote:
Originally posted by simon1966
Louis, I have heard plenty of anecdotes about burning up motors when running on 00 (DC simulation mode) but this is the first time I have seen actual photos! It looks like the resistors acted as a fuse? I wonder why they got so hot? Since you run DCC, why not just hard wire a decoder anyway? Removing that board would give you a lot more room for it.
Hi Simon. This was the first locomotive that ever fried on me. I always start with a new Locomotive that's non-DCC and test run it before installing a sound or regular decoder. So I don't understand what happened.
Someday if I find a good sound unit for it I may hard wire it in. But, for now Hal (halrey) was good enough to help me out, and give me a replacement board. That was a great thing he did! |
Louis
Pacific Northwest Logging in the East Coast |
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desertdrover
Engineer
USA
11332 Posts |
Posted - 02/20/2011 : 8:01:43 PM
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quote:
Originally posted by closetguy
Hi Louis
the colors on the resistors are in this order. Yellow.. Blue....Gold ...silver. obviously a non standard resistor.
Thanks Mike for the picture. I new it had to be a foreign resistor from the looks of it, but I couldn't tell what the colors were. It was well toasted. 
It was great that Hal was able to come through on this one, because from the looks of my PCB there may be other areas burnt up on that board. |
Louis
Pacific Northwest Logging in the East Coast |
Edited by - desertdrover on 02/20/2011 8:05:04 PM |
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sncf141r
Engine Wiper
Canada
180 Posts |
Posted - 02/21/2011 : 10:52:55 AM
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quote:
Originally posted by desertdrover
quote:
Originally posted by closetguy
Hi Louis
the colors on the resistors are in this order. Yellow.. Blue....Gold ...silver. obviously a non standard resistor.
Thanks Mike for the picture. I new it had to be a foreign resistor from the looks of it, but I couldn't tell what the colors
The reason that it looks like a foreign resistor is that it is a capacitor. :-)
yellow = 4
blue = 6
gold = multiply by 0.1
silver = 10% tolerance
(the resistors are little black squares; there are 4 diodes which are larger black squares, or sometimes roundish things; in the picture shown, they are roundish things with blue lines on one end)
Not really knowing, but I'd think that maybe these were for rfi suppression; I'd think that a) they are not needed, and b) the new circuit board will burn'em off as well - dcc is a highish frequency - it is NOT straight DC.
Just a bit of info, and a warning - Have never tried DC locomotives on a DCC layout, so I'm not writing this as a "believe me" type post.
JohnS.
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bitlerisvj
Crew Chief
USA
947 Posts |
Posted - 02/21/2011 : 11:49:34 AM
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Bachmann puts some extra components in their boards to appease EU noise requirements. Personally, I would yank the board and direct wire the decoder in. This will prevent any future problems. You will need to find out what voltage and current the lamps use. I will guess there is one for the headlight and one for the tender. I would NOT assume they are both the same. It is also possible that you can figure out which resistor(s) are used for the lamps and re-use them.
Regards, Vic Bitleris |
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richg1998
Engine Wiper
USA
124 Posts |
Posted - 02/21/2011 : 8:29:50 PM
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The alleged resistors are inductors in disguise used with the capacitors as a filter network to satisfy the EU.
The inductance is 4.76 microhenries. Standard values on a lot of Bachmann PC boards.
Look carefully at the body differences of leaded resistors and leaded inductors. Also, the basic color of the inductor is a dead give away that you have different components.
Try not to make assumptions.
Rich |
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richg1998
Engine Wiper
USA
124 Posts |
Posted - 02/21/2011 : 8:37:23 PM
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The heat probably changed the purple to blue.
All mine are yellow, purple, gold, silver.
Also, cut the capacitors as they are not needed. Do a Google search for Bachmann dcc capacitors..
Rich |
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sncf141r
Engine Wiper
Canada
180 Posts |
Posted - 02/22/2011 : 09:11:08 AM
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quote:
Originally posted by richg1998
The alleged resistors are inductors
Ah interesting - makes sense, but to me inductors always had a visible ferrite core - did not know they were packaged this way.
Need to drop the Roco stuff and look at Bachmann to see new technology, I guess! (working through old Roco stuff purchased in the '80s that has sentimental value)
:-)
Thanks;
JohnS. |
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richg1998
Engine Wiper
USA
124 Posts |
Posted - 02/22/2011 : 4:04:55 PM
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I have some Bachmann with the wire wound inductors in my 44 ton and 70 ton and the Ferrite inductors in my 4-4-0 and 4-6-0. The wire wound are on some diesels. The wire wound are twice as long as the ferrite but smaller diameter.
I just bought a new Spectrum 4-6-0 with Tsunami on board and it has the wire wound inductors and the Tsunami plugs into the PC board. I cut the caps out. With no caps, the inductors are a moot point.
I believe what you see is in the other Bachmann steamers when they say, Tsunami sound on board.
According to the loco diagrams at the Bachmann site, the decoder boards look the same. This Tsunami is not available over the counter or direct from SoundTraxx. It has less features than the Tsunami you buy.
Rich |
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railandsail
New Hire
6 Posts |
Posted - 05/03/2012 : 09:43:29 AM
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Maybe some of the contributors on this subject thread would have some suggestions on this modification I am undertaking?
Adapt Bachmann Vandy Tenders to run w Other Brands
http://www.railroad-line.com/forum/topic.asp?TOPIC_ID=36660 |
Edited by - railandsail on 05/03/2012 09:45:38 AM |
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Topic |
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Bachmann HO Climax PCB Problem
