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 Post subject: Dead Simpson Model 260 Series 6 VOM
PostPosted: Nov Mon 03, 2003 7:47 am 
Member

Joined: Jan Thu 01, 1970 1:00 am
Posts: 63
Location: Boca Raton, FL USA
I've acquired a Simpson 260 Series-6 VOM that was DOA but I figured probably only needed a fuse. Wrong! I checked the 1-amp fuse in the battery/fuse compartment as well as the internal 2 amp fuse under the printed circuit board and both tested good. I downloaded a copy of the operators manual from Simpson.com for a slightly later version of the Series 6 VOM but it did not contain (and their website did not offer) a schematic for this instrument. Although this is not a new meter I learned a lot from ones just like it and I'd like to salvage it if possible. Any suggestions for trouble shooting? I notice what appear to be a couple of diodes on the PCB but I'm reluctant to start pulling the components apart for out-of-circuit testing if there's something obvious I'm missing.<P>As always, thanks for your help.<P>Allan<P>------------------<BR>


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 Post subject: Dead Simpson Model 260 Series 6 VOM
PostPosted: Nov Mon 03, 2003 8:09 am 
Moderator

Joined: Jan Thu 01, 1970 1:00 am
Posts: 31224
Location: Livermore, CA
Hi Allan<P> Before you go through a lot of work make sure the meter movement isn't open. Connect a 1 1/2 volt battery in series with a 100K resistor across the internal meter connections. The meter should move.<P>------------------<BR>Norm


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 Post subject: Dead Simpson Model 260 Series 6 VOM
PostPosted: Nov Mon 03, 2003 8:18 am 
Member

Joined: Jan Thu 01, 1970 1:00 am
Posts: 2846
Location: Warwick,RI
Somebody here must have a schematic for the model 6.I certainly would not even consider giving up on this,period. VOM's are not terribly hard to service.<BR>Asuming a good meter movement and all functions dead you have automatically isolated the problem to whatever components effect all functions simultaneously.<BR>Shouldn't be hard to trace.<BR>Malcolm<P><BR><P>------------------<BR>


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 Post subject: Dead Simpson Model 260 Series 6 VOM
PostPosted: Nov Mon 03, 2003 8:24 am 
Member

Joined: Jan Thu 01, 1970 1:00 am
Posts: 7666
Location: Minnesota
Allan<BR>Schematic is on the way<P>Dave<P>------------------<BR>Intelligence is the ability to use your knowledge


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 Post subject: Dead Simpson Model 260 Series 6 VOM
PostPosted: Nov Mon 03, 2003 10:40 am 
Member

Joined: Jan Thu 01, 1970 1:00 am
Posts: 63
Location: Boca Raton, FL USA
Thanks for the replies (and the schematic, Dave). Norm's suggested test of the meter Movement itself seems on the mark - I got nary a jiggle out of the meter needle when crossing the internal terminals with 1.5V in series with a 100K resistor. Guess I'll have to watch eBay or the local flea markets for a working movement if I want to save this one.<P> Thanks again to all - it's WAY past my bedtime!<P>Allan<P>------------------<BR>


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 Post subject: Dead Simpson Model 260 Series 6 VOM
PostPosted: Nov Mon 03, 2003 9:07 pm 
Member

Joined: Jan Thu 01, 1970 1:00 am
Posts: 27069
Location: Pocasset, Cape Cod, MA
An open meter is very rare. I'd look carefully for a bad solder connection or something, inside the meter case.<P>------------------<BR>


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 Post subject: Re: Dead Simpson Model 260 Series 6 VOM
PostPosted: Mar Tue 20, 2012 10:11 pm 
New Member

Joined: Mar Tue 20, 2012 10:02 pm
Posts: 1
Most times, somebody measured some AC in the resister ohm mode. It blows out some resisters. In mine it was R17 (1.095K) and R18 (138ohms). Of course, neither is available so I had to build with series and parallel resisters to come pretty close.


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 Post subject: Re: Dead Simpson Model 260 Series 6 VOM
PostPosted: Mar Thu 22, 2012 5:17 am 
Member

Joined: Jan Thu 01, 1970 1:00 am
Posts: 364
AllanJN-

There's a lot of Simpson 260 info, including schematics and calibration procedures, in this thread:
viewtopic.php?f=8&t=56942

Alltare
AllanJN wrote:
I've acquired a Simpson 260 Series-6 VOM that was DOA but I figured probably only needed a fuse. Wrong! I checked the 1-amp fuse in the battery/fuse compartment as well as the internal 2 amp fuse under the printed circuit board and both tested good. I downloaded a copy of the operators manual from Simpson.com for a slightly later version of the Series 6 VOM but it did not contain (and their website did not offer) a schematic for this instrument. Although this is not a new meter I learned a lot from ones just like it and I'd like to salvage it if possible. Any suggestions for trouble shooting? I notice what appear to be a couple of diodes on the PCB but I'm reluctant to start pulling the components apart for out-of-circuit testing if there's something obvious I'm missing.<P>As always, thanks for your help.<P>Allan<P>------------------<BR>


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 Post subject: Re: Dead Simpson Model 260 Series 6 VOM
PostPosted: Mar Sun 25, 2012 12:22 am 
Member

Joined: Jan Thu 01, 1970 1:00 am
Posts: 31
Location: Adelaide Australia
I picked up a 260 Simpson about 10yrs ago in a salvage yard, it too was DOA, like you I hoped it was a blown fuse, I found a broken connection in the movement. My memory is a bit hazy but I know the break was not in a wire but in a thin metal strip near the back bearing pivot. A quick dab with a soldering iron fixed it.


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 Post subject: Re: Dead Simpson Model 260 Series 6 VOM
PostPosted: Mar Sun 25, 2012 12:45 am 
Member

Joined: Jan Sun 23, 2011 2:48 am
Posts: 88
My guess is that the original poster either got it working or gave up on it somewhere in the last 8 years.


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