Re: Triplet 630APL meter movement adjustment

On Apr 22, 8:14 pm, s...@xxxxxxxxxxxxx (Samuel M. Goldwasser) wrote:
captainvideo462...@xxxxxxxxx writes:
On Apr 22, 8:53 am, s...@xxxxxxxxxxxxx (Samuel M. Goldwasser) wrote:
captainvideo462...@xxxxxxxxx writes:
Well I made the adjustments as both Sam and Dave suggested. I want to
thank both of you guys for all the advice. I could never have done
this without your help. It was very difficult, but now balance in all
planes is very close. In fact its as close if not better than my bench
VOM. During the course of the procedure one side spring became so
distorted that it was useless, and the other simply launched itself
while I was holding it with the hemostat. Luckily I have a box of junk
260's and was able to scrounge two springs from an old movement. I'm
glad that I learned how to do this but I don't want to have to do it
again. You can easily destroy a movement with one careless.slip. Now
that the mechanical is resolved I have to deal with an electrical
problem. All AC ranges are inoperative. I found one resistor which was
burned  beyond recognition and was open but I have no schematic so I
cannot troubleshoot this instrument. I also found out that Triplett
was sold two  years ago ironically to Jewell Instruments, a company
here in New Hampshire. I called them today but they have little if
nothing to do with older equipment. No schematics either. Does anyone
know where I might be able to find a manual for a model
630APL? . .Thanks, Lenny

Assuming that only the one resistor is bad, estimate a replacement
based on the ohms/V rating of the meter.  Start high and work down
if there is any response.  If nothing else is smoked, you should be
able to figure it out.  Real engineers don't need !@$# schematics! :)

--
    sam | Sci.Electronics.Repair FAQ:http://www.repairfaq.org/

Yeah I tried that Sam but it appears that there is more wrong than
just that resistor. Lenny.

Oh well, it was worth a shot....

Check the rectifier.  If it got through the resistor, but DC ranges work,
that would be next in line.

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I checked the meter diodes and they were both shorted. They were some
obscure number that wasn't listed anywhere. So I pulled two out of an
old junk 260 that was of a similar vintage. I don't know if the
originals were silicon or germanium, if it matters but AC came right
up and the accuracy as compared to my digital was not too bad at all.
So my 1.00 flea market find needed a movement balance adjustment, it
had two burned resistors, for which I did find the values, and two
rectifiers for the AC. Someone really beat the shit out of this thing
but now that its repaired its actually pretty accurate. For the 30V
battery, I used four 6.50 V small lithium military surplus batteries.
Each battery is half the size of an aa battery. I soldered them
together and fit them inside the case. This was a nice little project.
Thanks again everyone. Lenny.
.

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