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Name this component


MrQuan

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Gidday,

 

Anyone know what this is?

 

http://arcade.catspyjamasdesign.com/images/misc/tumblep_component.jpg

 

I've got a stuck input (P1 - Button 1) on a PCB and I know it's not the wiring or push button (my other boards work fine). I replaced an IC and a dodgey looking supressor (one of those orange things on the right), still no go.

 

I traced the input to this thing... whatever is it. :rolleyes Googled the number, but that didn't help. :unsure It's not a resistor network, I guess.

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Hi McQuan,

What board is it from? It is possible to look it up on a schematic? Is the modules flat or does it have bumps like components have been embedded under it?

If it is a resistor networks it would probably be made up from 5 seperate resistors or have a common pin with 9 separate resistors. If it is a resistor network you can measure the other one next to it with a meter.

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I would have sworn that it was a resistor network, but they usually have a number with a letter like K or M directly after it to indicate the value ie: 1K would indicate 1000 ohms.

Usually control inputs like joysticks, switches , etc go straight to a resistor network.

 

I did a google search on data east rcdm 1 and got a hit. There is a word doc you have to open and it mentions something about maybe being rom or ram or some sort of custom chip.

 

Hope this helps you

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If its designated IC2 on the board I guess it isn't a resistor network. Also the bumps in the package indicate other chips. I once depotted a Sega chip which was embedded in resin like this. It was interesting to see what was inside but the chips inside were still labelled in Sega part numbers.
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Gidday,

 

Anyone know what this is?

 

http://arcade.catspyjamasdesign.com/images/misc/tumblep_component.jpg

 

I've got a stuck input (P1 - Button 1) on a PCB and I know it's not the wiring or push button (my other boards work fine). I replaced an IC and a dodgey looking supressor (one of those orange things on the right), still no go.

 

I traced the input to this thing... whatever is it. :rolleyes Googled the number, but that didn't help. :unsure It's not a resistor network, I guess.

 

It really looks like a custom resistor network to me. If all the pins except the one with the stripe above it go to an input on the edge connector, then this is what it is (acting as a pull-up). Is the pin with the stripe above it tied to the 5V rail? The blue ones look like capacitor networks.

 

Regards,

 

Johns-Arcade.

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Did you trace back to the 74LS245? its more likely that than the resister network (but not impossible)

If you want to be sure try swapping the two networks next to each other (they are the same by the looks) and see if the problem moves....

If you are tracing the fault you should see a high signal all the way back to the 245 chip.

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The bumps are more likely filter caps or diodes of some type, they would be there to arrest any bad spike in the signal and/or make the signal more compliant for the TTL levels.

My guess would be that a standard network would probably work but I have never tried as I have never needed to try it out. as far as the value goes you should be able to measure out of circuit what it is....

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Data Easy RCDM chip found on the Robocop 2 board?

 

I refrenced this document to find that

 

http://emustatus.rainemu.com/wtc/captamerica.doc

 

It appears to be a Logic chip. A RCDM11 is a (Module) Radio Control chip apparently. Another site suggests that they could be RAM or ROM chips of some kind. These also look like they could be memory chips.

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Did you trace back to the 74LS245? its more likely that than the resister network (but not impossible)

If you want to be sure try swapping the two networks next to each other (they are the same by the looks) and see if the problem moves....

If you are tracing the fault you should see a high signal all the way back to the 245 chip.

 

I traced it to a L4LS157 (at D2), which I replaced, input still stuck! So I've had another look and traced it to this resistor-network-ish thing.

 

I'll retrace it to be sure, I'm not experienced with PCB repairs, but I'd like to give it a go :rolleyes I'll try swapping if I confirm the trace. Thanks for the advice :)

 

If thats tumble Pop I've got like 4 or 5 junk boards here you can pull a spare off.

 

Yeah it's Tumble Pop, I'll give it a go and try to determine the problem. You'll probably hear from me soon though :p Thanks!

 

----------

 

 

Data Easy RCDM chip found on the Robocop 2 board?

 

I refrenced this document to find that

 

http://emustatus.rainemu.com/wtc/captamerica.doc

 

It appears to be a Logic chip. A RCDM11 is a (Module) Radio Control chip apparently. Another site suggests that they could be RAM or ROM chips of some kind. These also look like they could be memory chips.

 

Oh wow, I just checked that document, thanks for that

 

Data East Chips:

 

Data East 49 chip

Data East 52 (9125EV 173711 VC5259-0001 Japan) chip

2 Data East 56 (24220F005 Japan 9129EAI) chips

Data East 71 (Japan 9125EV 178061) chip

Data East 75 (L7A0680 9044) chip

Data East 101 (9119EV 180883) chip

9 RCDM-11 1 9 chips (at IC1, IC2, IC3, IC4, IC6, IC7, IC8, IC9 & IC10)

 

I think I'm more confused now, haha

 

I'll trace the input out again and try swapping this component with another~ then I'll go from there :)

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Just saw this thread. Judging by the IC designator and the shape, I'd say it's what we call a thick film chip. They can have a mixture of components in them so are next to impossible to replace with anything else. They're used to reduce board space and sometimes just to make it hard to reverse engineer!
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