Need help with DoorKing component identification

Have you tried these guys?

Hi Justin,

You're probably going to find there's more than a bad resistor on the board. Resistors don't burn out unless they get a lot of over current through them. That current likely came from another failed component. A bad power supply can cause it but that's only one of several possibilities.

Have you contacted DoorKing on this? They'll repair it for a reasonable fee. If you don't have a relationship with DoorKing and you decide to have them fix it anyway, contact me and I'll make the arrangements for you. Just pay whatever they charge for the repair.

Thanks for the posts guys. Here's the situation. I know nothing of this system. This circuit board was brought to me because the owner DOESN'T want to pay for a new board. I only have this 1871-010 board, so I can't diagnose any other part (power supply, etc.). I was going to replace the resistor for them for $2 and send them on their way. The owner pulled the board, the owner pointed out what they wanted me to replace (the burnt resistor). I'm not troubleshooting, I'm just the solder grunt. If it does or doesn't work is of no consequence to me.

So, any ideas on the value of R18?

I'd walk away from that customer as fast as my feet would carry me if I were you. It's not worth the hassle for a few dollars, plus if he's that cheap he might also be lawsuit-happy. That's not a good combination. Besides that, it's highly unlikely that replacing the resistor will solve the problem that caused it to burn out in the first place.

You should advise the owner that replacing the resistor will not fix the problem that caused it to "burn up" in the first place. I do recall Mirtone having a situation where they used the wrong wattage on a couple of resistors in their single zone fire alarm panels years ago. Replacing the units with 3/4 watt ones instead of 1/4 watt originally supplied fixed the problem. This isn't the case with DoorKing though.

Ask your DoorKing distributor if you can have a quick "boo" at a board to find out.

It seems like a lot of effort for $2.00

Doug L

I certainly hope that the $2.00 figure he mentioned doesn't include labour. Talk about giving away the shirt... Why not the pants and underwear too?? :-)

If the chip is fried forget it..otherwise DKS will repair the board for like

You're assuming too much liability for only 2 bucks...walk away.

If the owner "knows" what's wrong, why isn't he replacing it himself? Anyone that "knows" what he knows ought to be able to do a little soldering.

Sounds like you'd be buying him a new board after he says "all it needed is a resistor...you fried it..you replace my board"

Thanks for all the advice, but I really just need someone to identify the resistor value for me at RP18. If it doesn't fix it, it doesn't fix it. Again, I'm just the solder monkey. The just want me to solder in a new resistor. I'm not the one troubleshooting the circuit.

So, does anybody know what the resistor value is at RP18?

Thanks.

I doubt you'll find a schematic. Call Door King, maybe tech support will tell you what it is. I looked at all my paperwork from DKS and nothing goes down to schematic level. Sorry.