IDM Mod 140 volt
Senior User
Joined: Aug 2012
Posts: 172
Likes: 0
From: In the desert.
I made sure not to touch anything together as far as that goes,i didn't bridge anything either,i may have got it a little to hot is all i can come up with or maybe there was a under lying problem that i agitated or something,i had a lot of trouble getting the 2064 off but i didn't keep heat to it long,i got it warm and worked at it and blew it to cool it off again when i felt it was to hot,i re soldered it 3 time with new resistors each time thinking maybe the resistor was bad but that didn't help it,its just cranking no smoke at all either,im all out of ideas hahaha
Senior User
Joined: Aug 2012
Posts: 172
Likes: 0
From: In the desert.
Thanks old bird,yeah i messed up by not having a spare,i though i would be ok,im good with a soldering iron,i work on my cbs sometimes when then need repairs so i just followed the steps and did the same as working on a cb,keeping the heat down and stuff to keep from damaging it,i do kind of suspect i got it to hot,i had some trouble getting that 2064 or what ever it was off,thats the only thing i think i may of messed up,i am not sure though haha
Thread Starter
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Fleet Mechanic
Joined: Oct 2006
Posts: 1,386
Likes: 1
From: Spokane, WA
Mike, it is possible you used to much heat and damaged components or a traces or pads nearby. How many watts was the soldering iron you were using? The circuit boards they used in our IDM's were really pretty tough. Quite a few that have had little or no soldering experience have been successful though, or maybe we just don't hear about the failures IDK.
Where did you get the resistors and what kind/size? I am assuming you have the correct value for your IDM.
Just a possibility could you have possibly bent or damaged a connector pin when you put the IDM back in?
If one of your friends has a working IDM, see if you can do a swap just to verify the problem is the IDM, sometimes **** happens.
Where did you get the resistors and what kind/size? I am assuming you have the correct value for your IDM.
Just a possibility could you have possibly bent or damaged a connector pin when you put the IDM back in?
If one of your friends has a working IDM, see if you can do a swap just to verify the problem is the IDM, sometimes **** happens.
Senior User
Joined: Aug 2012
Posts: 172
Likes: 0
From: In the desert.
The soldering iron i use is a 25 watt one,As far as the resistors goes i got the 75ohm 1-2 watt 1% tolerance,i got those from china hahaha they were hard to find to,i ended up getting 40 of them in case i need them for any thing else i may need them for,i will try a different idm from a friend and see what happens,thanks for the help,im glad there is good people on here willing to help out,i love this forum.
Thread Starter
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Fleet Mechanic
Joined: Oct 2006
Posts: 1,386
Likes: 1
From: Spokane, WA
The resistors are a bit hard to find, but available at the following link Digi-Key - PPC75.0KXCT-ND (Vishay/BC Components - SFR16S0007502FR500)
Last three numbers of IDM serial number is current volts
Here they are:
IDM-100 uses a 75.0k Ohm (75,000 ohm) 1/2 watt 1% tolerance Metal Film resistor
IDM-110 uses a 75.0k Ohm (75,000) 1/2 watt 1% tolerance Metal Film resistor
IDM-120 uses a 73.2k Ohm (73,200) 1/2 watt 1% tolerance Metal Film resistor[/QUOTE]
Mike, did you use the above guide to find the correct resistor to upgrade your IDM to a 140?
Last three numbers of IDM serial number is current volts
Here they are:
IDM-100 uses a 75.0k Ohm (75,000 ohm) 1/2 watt 1% tolerance Metal Film resistor
IDM-110 uses a 75.0k Ohm (75,000) 1/2 watt 1% tolerance Metal Film resistor
IDM-120 uses a 73.2k Ohm (73,200) 1/2 watt 1% tolerance Metal Film resistor[/QUOTE]
Mike, did you use the above guide to find the correct resistor to upgrade your IDM to a 140?
FOREIGN GURU
Joined: Jul 2006
Posts: 7,655
Likes: 7
From: Celaya, Gto. MX
The soldering iron i use is a 25 watt one,As far as the resistors goes i got the 75ohm 1-2 watt 1% tolerance,i got those from china hahaha they were hard to find to,i ended up getting 40 of them in case i need them for any thing else i may need them for,i will try a different idm from a friend and see what happens,thanks for the help,im glad there is good people on here willing to help out,i love this forum.
The resistors are a bit hard to find, but available at the following link Digi-Key - PPC75.0KXCT-ND (Vishay/BC Components - SFR16S0007502FR500)
Last three numbers of IDM serial number is current volts
Here they are:
IDM-100 uses a 75.0k Ohm (75,000 ohm) 1/2 watt 1% tolerance Metal Film resistor
IDM-110 uses a 75.0k Ohm (75,000) 1/2 watt 1% tolerance Metal Film resistor
IDM-120 uses a 73.2k Ohm (73,200) 1/2 watt 1% tolerance Metal Film resistor
Last three numbers of IDM serial number is current volts
Here they are:
IDM-100 uses a 75.0k Ohm (75,000 ohm) 1/2 watt 1% tolerance Metal Film resistor
IDM-110 uses a 75.0k Ohm (75,000) 1/2 watt 1% tolerance Metal Film resistor
IDM-120 uses a 73.2k Ohm (73,200) 1/2 watt 1% tolerance Metal Film resistor
Yes, check that number very well.
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Postmaster
Joined: Sep 2007
Posts: 4,195
Likes: 6
From: Medford Oregon
Hope you meant 75K (75,000 ohms), not 75 ohms?
Senior User
Joined: Aug 2012
Posts: 172
Likes: 0
From: In the desert.
I think i got the wrong one,i did get the 75 but it was ohms not 75k i did go by the chart and my idm is the idm 100,i though i was in the clear, i didn't know there was a different type i saw the 75 ohm and though i was ok,it is the 1-2 watt 1% tolerance,i learned something here for sure hahah,now the question is if i order the correct one do you think my idm is any good still or fried due to the wrong resistor?i would sure love to get it running again im missing driving it to work hahah,thanks for all the help guys.
Postmaster
Joined: Sep 2007
Posts: 4,195
Likes: 6
From: Medford Oregon
This is just a guess but I suspect replacing with the correct resistor will fix the problem and no harm has been done to the IDM, it's just a timing circuit. In any case I would certainly try as the resistor is only a few bucks.
Senior User
Joined: Aug 2012
Posts: 172
Likes: 0
From: In the desert.
Thanks Hussler,Im most defiantly going to try the correct resistor for sure,a few bucks sure beats 500 hahah,i hope it fixes it and runs good,i got to order a correct one and go for it,now the fun part,taking apart the idm after i put silicone on it to seal it up again haha
FOREIGN GURU
Joined: Jul 2006
Posts: 7,655
Likes: 7
From: Celaya, Gto. MX
Thanks Hussler,Im most defiantly going to try the correct resistor for sure,a few bucks sure beats 500 hahah,i hope it fixes it and runs good,i got to order a correct one and go for it,now the fun part,taking apart the idm after i put silicone on it to seal it up again haha
I read that in some write up but dont remember where, but seems logical. 
BTW, you are my friend now. OK?
