But operates well. Battery replaced with BCR prior to start up. I let it charge for 10 minutes and then ran the locos. I get NO sounds at all. Is the chip scrambled? Any other testing I can do?
Thanks!
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Do you happen to know the model #? If not, was the BCR one of the variety that looks like a 9-volt battery?
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@MikeH posted:Do you happen to know the model #? If not, was the BCR one of the variety that looks like a 9-volt battery?
20-2260-1 Proto 2. Yes the BCR looks like a 9 Volt
It's a PS2 5V board. First guess, speaker was or is flaking and shorted, that either has or will blow the amplifier on that 5V board. And while I have done that repair and replaced an amplifier, given the propensity of some other failure like a capacitor or other known 5V board failure. Again, sorry, I'm just trying to be practical here. I don't know your skillset, you already spent time and money replacing with a BCR, and now we are finding that best case, the speaker might and probably is bad (specifically a 16Ohm one) and might have taken out the amplifier of the PS2 5V board.
Not looking good.
https://www.mthpartsandsales.c...lists/112?type=lists
I know you need a 16 Ohm speaker, but I don't know if that engine takes a 50mm or 45mm, and also any clearance details about the magnet shape and height.
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Rob, I'm not sure if you know that early PS2 boards are "PS2 5-volt". When the 5-volt boards fail, they're not repairable. That's what Vernon is referring to. So if you have another speaker laying around, it's definitely worth testing the amp. If the amp is indeed blown, then it might not be worth repairing because at some point, that board is going to go.
50 mm diam. 18 mm depth 2w I ordered one. Is there a way to check the speaker with a meter to see if bad? open circuit is bad yes?
Thanks guys. Appreciate the help. are all 5v PS2 boards susceptible ? I have a few locos from the period.
https://ogrforum.com/...ps2-5v-board-failure
https://ogrforum.com/...ailure-causes?page=1
https://ogrforum.com/...-speaker-replacement
https://ogrforum.com/...44#29868550242088644
Yes, you might want to check your fleet for flaking speakers, leaking batteries, about to blow Wincap capacitors.
The below picture is about as close as you can get to an early warning sign of "it's about to blow".
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Thanks for the information. Caps are flat as a board on this one.
@Rob English posted:50 mm diam. 18 mm depth 2w I ordered one. Is there a way to check the speaker with a meter to see if bad? open circuit is bad yes?
Yes, both visually checking the magnet to ensure it is not crumbling or the alloy coating is not flaking. Yes, open circuit is the obvious one but that is not the failure- the real failure is short to frame. This could be an intermittent short but the idea is the thin coated wire that makes up the voice coil is around that magnet pole in the center and if the outside is flaking- the inside is flaking and that shews through the thin insulation and shorts the coil to the pole piece. That in turn connects AC frame ground to the speaker wires backfeeding AC up into the PS2 board.
And there lies the issue- testing for an intermittent condition that may or may not have happened but is likely -highly likely in many cases.
Speaker, speaker wires. Simple test. If it functions and the audio amp is bad that is worth the repair. G
Right on G. Thanks
The whole flaking shorting coil is a red herring. Can it happen I guess so, but I have not seen it. I have seen very few shorted speakers and they have been 4 ohm. Just last week I replaced a flaking 16 ohm, when I pulled the speaker up the magnet came off an exposed the coil in the speaker frame. Shiny and new.
Just another 5V myth from my perspective. G
