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You are currently reading a thread in /diy/ - Do It yourself

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Hello /diy/

I purchased a Marshall 250 dfx with a couple broken connections. Soldered most.
I am missing one component on the board and was wondering if anyone here has an idea
>>
The missing piece is right in the center of the picture and b/w two identical pieces. Trying to figure out what it is.
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>>928044
If you are referring to R24 then it appears to have not been installed from the factory (IE: "should" be missing).
>>
>>928044
Yeah, its supposed to not be there. They do that sometimes when they change the design but don't want to pay to have the manufacturer change the board. Among other reasons.
>>
whether it should be there or not, if it wasn't supposed to be a 220R then i will be very upset.
>>
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1438799223847.jpg
8 KB, 190x200
>>928209
>yfw it's 220 but the tolerance band is silver
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>>928211
that would be just about bearable as long as it was lined up.
if it was out of line then i would lose it.
>>
Directly to the right of the "missing" resistor, what's the point of those pieces of wire?

Why aren't they just printed on the PCB?
>>
>>928231
Because track orientation. If OP flipped that board so we could see traces you would observe they run left to right (as the picture is currently orientated), making tracks/circuit routes that run up and down the board difficult to run. Thus, jumpers are used to "hop" over the tracks on the PCB. Kind of like bridges over rivers.

In effect, it's like a poor man's double sided PCB. though instead of tracks on the component side, they use wires. If you go look at a computer motherboard you'll notice the same. All tracks on one side go east > west, tracks on the other side go north > south.
>>
>>928231
Because there would be overlap with the other printed stuff. Imagine if you drew four lines on one side of a piece of paper and you had to draw another one going perpendicular to them. You can't just draw over the four lines, cause then they'd all be connected and theey aren't supposed to be.

When wires are like that on a board they're called 'jumper wires' or 'jumpers', cause they jump over the other traces on the board. Hence why they're labled J1, J2, etc.
Thread replies: 10
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Thread DB ID: 403380



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