Tron PCB Part ID

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Cleaning up my Tron today and noticed something that needs attention. Can solder a part like the best of them, but ID skills are crap. What do I need here...

(note the toasty resistor-looking bit)

Thx,

Brian
 

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According to the manual, that's location L116 - meaning it's an inductor. Unfortunately, the value isn't listed in the parts listing. BUT - the color codes indicates it is a 10uH +/-10%...
 
Unfortunately, the value isn't listed in the parts listing.

Yeah it is (see attached).

Inductors like this were often used to limit HF noise and comply with FCC regs. In a pinch, it can be replaced with a jumper wire.

However, as Ed pointed out, there is likely an underlying problem that caused this. If that's not fixed, a jumper wire won't form as nice of a "fuse" as a 10uH inductor will...
 

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I had the same problem happen when someone plugged in the MCR II board into a MCR III game cab. Yes the wire harness will connect to the board, but the part got fried because of the incompatibility of the boards. I have a Tron 3 board set and I had the same problem, just replaced the part and you should be good to go....
 
Thanks gents!

This might explain the high-pitch sound I've been hearing.

Will look to recap the boards. Anyone sell rebuild kits for Tron?

Brian
 
I have a Tron PCB that also has the same part burned on my CPU. However mine are black and do not have bands on them.

Narrowed it down to the sound I/O board causing the issue. With the board plugged in, the component smokes. With just the CPU and Vid Gen board plugged in, the component is fine.

Any ideas what to look for on the sound I/O board that is causing the problem?
 
I have a Tron PCB that also has the same part burned on my CPU. However mine are black and do not have bands on them.

Narrowed it down to the sound I/O board causing the issue. With the board plugged in, the component smokes. With just the CPU and Vid Gen board plugged in, the component is fine.

Any ideas what to look for on the sound I/O board that is causing the problem?

Very good to know. Hoping someon chimes in!
 
I've had this problem on a couple of boards. I don't THINK it's due to mismatching MCRII/III boards, but I can't say for positive.

For me, I burned out the same inductor from the looks of the location.

It was due to a shorted capacitor on the top board (super sound/io). Those little black diodes on the different columns are between +5V and GND. When they short out, they suck a bunch of current through that inductor.

Sometimes you can find the shorted one because it swells up from the current/heat. Otherwise, you can pull up one leg at a time on them until your ohm measurements show the short disappear.

Kerry
 
Elutz is right on as usual.

MCR 2 and 3 pcb stacks will work fine to test video and power. Often times controls are different, but you will not damage one by plugging them into each other.
The inductors are part of the fcc compliance, and aren't necessary. Replacing them with a jumper wire is fine.
Normally, its caused by a short in one of the black tantalum bullet shaped caps on the ssio- most times on the 12v line.
 
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