Resistor SIL ID required

Solder

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Someone I know just asked me the following:

"I have a Taito Extermination (similar to new zealand story hardware) with errors on the color blue due to a broken resistor row called RO 012 (8 pins). Do you know what value this is?"

Any ideas please anyone ? I don't have a board to check.

Thanks
 
Got a good, clear close-up pic of it showing the part #?
 
Sounds like a resistor ladder... unfortunately those are special items.

I'll dig through some boards and see if I can find one on a parts board. If not, you'll have to make it out of individual resistors and hope you can figure out how they are connected internally.
 
If you have a spare that would be great thanks.

As you say, the only other option would be to make one out of individual resistors, but short of carefully taking a good SIL apart/scraping off the coating it would be tricky to wire them all up correctly.
 
I haven't managed to find any, but even if there are, they wouldn't give exact details on the SIL's internal config.
 
Here's a pic of a good one:

http://i59.photobucket.com/albums/g319/Dalek99999/DSC02269.jpg

Apparently resistance measurement on the pins (from pin one) gives different values, 1.5 kohm, 330 ohm, 650 ohm (that's all I've been told so far).

Thanks

Sometimes you have to remove a SIP from the board to get an acurate reading (depends on what all is connected to it). Also, you tried reading it as if it was "bussed".....it could be an "isolated" SIP.

Edward
 
Edward's right... but if this were in the video out circuit I'd expect it to be bussed. The different values give you different intensity levels for the line being tied together with the others. The common line would be the output.
 
To answer this question, now got hold of this board, removed an existing R0-012 and measured the resistance between pin one and the rest (it's bussed). Results as follows:

Taito bussed resistor R0-012

Pins Resistor value

1 to 2 - 1K
1 to 3 - 6K
1 to 4 - 3K
1 to 5 - 1.5K
1 to 6 - 700 Ohms
1 to 7 - 330 Ohms
1 to 8 - 330 Ohms

Made up a test replacement with the relevant resistors, now to get hold of some small resistors and do it nice and tidy ........... :)

Ta for everyone's advice.
 
To answer this question, now got hold of this board, removed an existing R0-012 and measured the resistance between pin one and the rest (it's bussed). Results as follows:

Taito bussed resistor R0-012

Pins Resistor value

1 to 2 - 1K
1 to 3 - 6K
1 to 4 - 3K
1 to 5 - 1.5K
1 to 6 - 700 Ohms
1 to 7 - 330 Ohms
1 to 8 - 330 Ohms

Made up a test replacement with the relevant resistors, now to get hold of some small resistors and do it nice and tidy ........... :)

Ta for everyone's advice.

Are you sure that's supposed to be a bussed resistor pack? That's some strange readings. Try reading...1 to 2, 3 to 4, 5 to 6, and 7 to 8....what do you get?

Edward
 
Well, it works perfectly. :)

But as you asked:

1 to 2 - 1K
3 to 4 - 9K
5 to 6 - 2.2K
7 to 8 - 400 Ohms

Which actually looks worse ............ :)
 
Well, it works perfectly. :)

But as you asked:

1 to 2 - 1K
3 to 4 - 9K
5 to 6 - 2.2K
7 to 8 - 400 Ohms

Which actually looks worse ............ :)

Odd network.

First three look fine compared to what you listed before.
But that last one... are you sure it's 400 and not closer to 600 (or 660)?
 
Nah... It's a ladder...

Look at the schematics for the Neo Geo. It has similar resistors on the outputs.
 
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