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Sencore LC102 Vs Sencore LC103

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Bill Kelso:
Hi Guys and Gal's..(Don't know if there any here ) Just being PC. As you can see I have a Sencore LC102 & a LC103 Cap Checker. And I just picked up a Sencore LC103. I was told that the LC103 had a Problem. I did get a good price due to that. It looks brand new and looks like it has never been opened. I have it open now and just blew the dust of the IC Top side. It's very clean. I have a full complement of test gear here.

So I wanted to make sure the LC103 is working and or locate the problem. So Here's the Problem on the LC103. I can't find one??? The only thing that I don't understand between the 102 and the 103 Is the Cap Leakage test.

They both show that the cap is good but the way they both display it has got me wondering. I will post a pick I found on line of the LC103 in the Cap Leak Check mode. Notice that The Lower bar graph is full on to the right, And the Leakage in Ua is "0"?? But the upper right shows resistance in Ohms and it says "Good"

The LC102 display shows in Ua's and says "Good".  It does not display in Ohms.

I'm beginning to feel that nothing is wrong with the LC103. It would be great it those of you agree with me here on this reading. I Have checked a number of caps with the LC 103 and have yet to see an indication Of Leakage in Ua's.

I just happened to pop in here after doing a search on googel and ran into a thread fro 2019 about repair problems with the LC 102. So.. Gald to be here with the experts and Thankyou in Advance.

I served in Vietnam thru 66-77 and when I had a Problem I always went to the Old school Sergeants to set me straight. I hope someone here can help out. :-+   

liaifat85:
Ok, so you were told that the LC103 'had a problem'? Didn't the supplier tell you what the problem actually was?

coromonadalix:
normally on each start  you do  the 1st thing, the open and close calibration .... before doing anything else

on the internals  the main pcb of the 103  is highly condensed  with some i/o  ic's  and more evolved too for the lcd and display tests,  you have more informations given

the voltage generator pcb is supposed to be the same, it goes up to 1 kv,  warning here

but i think  the 103  gives an impedance measurement scale / vs leakage, but reading the user manual  will tell you more



you could  ask :  volvo_nut_v70 in the sell thread second page

he as one to sell right now, he could do some "compare"

Bill Kelso:

--- Quote from: liaifat85 on December 04, 2023, 10:24:41 am ---Ok, so you were told that the LC103 'had a problem'? Didn't the supplier tell you what the problem actually was?

--- End quote ---

No I bought the unit from a seller who handles Sencore stuff. He re-ferbe's it and re sell's Sencore. He is so backed up and he had just picked the LC103 up and offered it to me cheap and will be supplying tech info on repair. He didn't have time to check it out. So I bought it. The price was very low. He used to work for Sencore back in the day as an Application Engineer. So he still has contacts with Sencore people.

He is hard to get in contact with as he travels for a new company. But he still list's his many Sencore items for sale. He is only home once a week and shipment times can take a while.

I just received it and started to check it out. As noted .. The LC102 Does show Ua and a good bad indication. But no impedance as the LC103.

What's got me is the unit posted is for sale on another site and has pictures of each button press under test. As you can see.. That one shows "0" Ua. 

Bill Kelso:

--- Quote from: coromonadalix on December 04, 2023, 11:29:18 am ---normally on each start  you do  the 1st thing, the open and close calibration .... before doing anything else

on the internals  the main pcb of the 103  is highly condensed  with some i/o  ic's  and more evolved too for the lcd and display tests,  you have more informations given

the voltage generator pcb is supposed to be the same, it goes up to 1 kv,  warning here
--- End quote ---

but i think  the 103  gives an impedance measurement scale / vs leakage, but reading the user manual  will tell you more



you could  ask :  volvo_nut_v70 in the sell thread second page

he as one to sell right now, he could do some "compare"
[/quote]

Thanks coromonadalix for the reply. I really appreciate it.

I have read the manual.. And it does talk about leakage and refers you to the leakage chart. But the unit never shows leakage, just Impedance with "0" Ua. Also I am totally familiar with the Don't touch the leads when the LED is flashing..L.O.L.   I used to have an LC103 when working as a repair tech for the Golden Nugget Casino in Atlantic City repairing all there Pro Sound gear.  Any way I have had the LC102 which I picked up about 2 months ago. This deal with the LC103 came up and I knew I had to repair something.

But what's got me confused is that I have seen one on Youtube that does show Leakage and Impendence in the Leakage test ....and the one for sale on another site in this picture I posted that doesn't. I can't remember when I used mine back in the day in my shop if it showed Ua or not.

I would hate to find out that it's an big IC that is messed up. I do have a Pace de-soldering station. But that is something I don't want to have to do if it is and IC... Maybe a Relay with Dirty contacts that feeds info to the display from an IC. Whish full thinking....L.O.L.

 



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