Author Topic: Sencore DVM56  (Read 1549 times)

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Offline Vintagevalves

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Re: Sencore DVM56
« Reply #25 on: January 16, 2019, 05:06:48 pm »
Also, let me rewind a bit and restate that when I got this thing the +5V regulator was dead.  I'm not sure how or why it became that way.  This could be part of the solution. 
 

Offline Vintagevalves

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Re: Sencore DVM56
« Reply #26 on: January 16, 2019, 09:49:13 pm »
 5V  5-10hz P-P square(ish) wave out of my old Leader audio generator into pin 4 of the LD120 still results in no output on the LD120.   +15 an -12V present on correct legs and grounds trace out.  Dead LD120???
 

Offline Chris56000

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Re: Sencore DVM56
« Reply #27 on: January 22, 2019, 09:41:42 pm »
Hi!

I would obtain another LD120 before you go any further with your meter!

A quick check you can try is to lift pin 15 of the LD120 and leave it floating temporarily, this should cause the display to flash "888.8" continuously – this device is noted for internal failure!

Chris Williams
It's an enigma that's what it is!! This thing's not fixed because it doesn't want to be fixed!!
 

Offline Vintagevalves

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Re: Sencore DVM56
« Reply #28 on: January 26, 2019, 10:15:27 pm »
Swapped the LD120 with no improvement.  :--


I think I'm ready to give up on this thing and move on to more fun projects.  As cheap as used much more modern DMM's are on the used market I don't see any reason to put more time into this thing. 

I'd probably be willing to ship this thing to anyone who wants it for the cost of shipping.  Mostly re-capped, PSU has had all the carbon comp resistors replaced.  I have lifted and repaired a few traces on the function boards.  :-[
 

Offline Chris56000

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Re: Sencore DVM56
« Reply #29 on: January 27, 2019, 07:53:20 pm »
Hi!

PM sent - I've decided to take it on as a challenge I can't resist!

Chris Williams
« Last Edit: January 29, 2019, 08:49:04 am by Chris56000 »
It's an enigma that's what it is!! This thing's not fixed because it doesn't want to be fixed!!
 


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