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Sencore LC102 & LC103 Capacitor & Inductor Analyzer

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HighVoltage:

--- Quote from: coromonadalix on August 19, 2019, 01:43:39 am ---The lc102 need a few  parts for calibrating it myself

I have a hard time to find 0.25% precision caps and some coils values in Canada



--- End quote ---
The caps and inductors should also be easy to get.
Let me see what I can find in my bins.

I will use my Philips / Fluke PM6306 to select the values of caps and inductors.

Xenawise:
@HighVoltage:

Hello, looks like you have a first production version of you PCB's (Version "B"). I recently repaired this version LC103 (it would fail the "OPEN" test but complete the "SHORT" test - turns out it was one of the SOT-23 2N3906 - Q13 - transistors in the low current source circuit. The transistor is completely open, all leads! Not sure what happened to it, there are no physical signs of failure either like too much current blew a chunk out of the case or something. It looks "normal" just like it's sister (it is connected in a darlington pair). Took quite a while to find this as well, I would say I have over a week into troubleshooting alone and since I have two LC103's now I could do some part swapping to help with the process.

In any case, I see that your EPROM is version 1.53! I have a Version "C" LC103 as well (I have two of them and actually three LC102's, one of them I need the LCD displays for as they got cracked during some shipping damage) and it has version 1.41 of firmware. Perhaps you could pull the EPROM and read it and post up the resulting BIN file? I would love to update to the latest firmware, although I wonder if the calibration of the unit is somehow tied the version of firmware (highly likely) so it might just be better to stick with whatever EPROM shipping in the unit to maintain the calibration. My Version "B" LC103 has firmware version 1.31. I have swapped the 1.41 firmware chip into the Version "B" and it does work, and your pictures show you have a Version "B" unit with version 1.53 firmware. Maybe it was sent in for repair or calibration and Sencore updated the firmware during the repair. As for Version "A" models, I don't think they were sold and were probably the last of the pre-production units. I believe Version "B" PCB's were the first production runs. My Version "C" unit does not have any of the bodges that the Version "B" PCB's have, and the power supply unit has some significant changes as well.

In any case, have fun with your LC103! They will only rise in value as time goes on I predict, unless some manufacturer comes up with something that can replace it which I doubt will ever happen.

Regards,

Xenawise

coromonadalix:
A 20 farad or 20 henry lcr seems improbable, with an 1kv leak test ?? more improbable ?  seen tons of models up to  100,000uf  seen nothing in recent models higher or equal to the lc102, lc103  can offer ??

I can be wrong

HighVoltage:
@Xenawise
Very interesting, thanks.

OK, I will get the EPROM version 1.53 read out.

Based on your facts, it really seems that my unit was repaired at a later time and the new FW installed.

syau:
Scored a LC102, unable to zero on short, other capacitor measurement work except the ESR which give -ve  :palm:

Managed to open up the cover on the big white relay, cleaned the contact with deoxit, also did so with the adjacent one. Still fail when I do zero on short. Surprising, it show short when I shorted the lead during capacitor measurement.

Need to do some trouble shooting on the ESR circuit.

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