Author Topic: Voltcraft 6010 DMM (NOS from 1984) unboxing and teardown [picture heavy]  (Read 8065 times)

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Offline Idbid

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  • Posts: 2
  • Country: au
I got hold of a similar meter a couple of weeks ago, it's a University (Yu Fong) YF-1100. Same side push button arrangement, also uses the Intersil 7106 chip. I think it may date from 1985. The 7106 chip wasn't working properly so I put another one in it, that seemed to do the trick. I can upload some photos either here or on a new thread if anyone wants, it might be interesting to someone. I couldn't find much information on the meter by Googling, except for a couple of similar ones for sale and some old magasine ads for it.
This thread & posts encouraged me to have a go at fixing it, thank you!
 
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Offline andi112

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  • Country: de
"The 7106 chip wasn't working properly"
How did you realized this? Which error it showed?
 

Offline Idbid

  • Newbie
  • Posts: 2
  • Country: au
Hi,
   It was a bit random. it would often say -1666 or just some other random numbers every few seconds. I read somewhere (I think on EEVBlog) that the 7106 shows 1666 or something continuously if the oscillator circuit is faulty. The analogue input voltage to the chip seemed stable and reasonable depending on the range and voltage applied at the meter input. The 7106 is in a pluggable socket so I decided to try swapping it, cost about $16 delivered. That fixed it. The display always worked OK though, so not really the same fault as you seem to have, but it might still be worth swapping the 7106 if you don't find anything else amiss. That's just a suggestion, I'm not an expert at all.

I can put some pictures of the PCB up, either here or link it to a similar new post for info on my particular meter. It uses a plastic velum with conductive "zebra" stripes between the 7106 and the LCD, yours seems to be different in design there. The YF-1100 is all built up on the same top PCB side as yours though, the Voltcraft 6010 has components on the bottom side which is interesting.
 


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