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Old 14th May 2010, 08:22 PM   #1
imix500 is offline imix500  United States
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Default Sencore CA55 Cap Checker

Hello all,
I just picked up an old Sencore CA55 Capacitor Analyzer. On power up I get digits for about 1/2 second and then flashing "888". I'm assuming this is some sort of error code but I don't have a manual and there's very little from google. Anyone have any idea? Thanks!
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Old 15th May 2010, 12:06 AM   #2
imix500 is offline imix500  United States
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It looks like "888" normally means out of range, but it shows it with nothing connected. Input fuse is good, hmm...
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Old 15th May 2010, 02:51 AM   #3
Enzo is offline Enzo  United States
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So what happens if you connect a cap to the test terminals?

And contact Sencore for owners and service manuals.
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Old 15th May 2010, 03:41 AM   #4
imix500 is offline imix500  United States
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Well, nothing really. When I press "measure cap", the display goes blank, one of the range leds lights, and I measure about 150mV across the cap under test. As soon as I release the button the display goes back to flashing "888".
I know these need a sec or two to measure, but it shouldn't need that long right?
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Old 15th May 2010, 04:19 PM   #5
Enzo is offline Enzo  United States
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Sounds defective, still going with call Sencore.
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Old 15th May 2010, 04:33 PM   #6
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That is a common problem with those. Open it up and clean all the contacts and switches and it should be fine.
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Old 15th May 2010, 05:21 PM   #7
imix500 is offline imix500  United States
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Thanks Steve, sounds like a good Sunday project!
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Old 16th May 2010, 07:36 PM   #8
imix500 is offline imix500  United States
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So, I cleaned the rotary switch and the selector switch as well as I could. I think it made some difference as it seems to ask a little different. Also found a burned up 5k 5W cement resistor on the selector switch.
Now that I have it opened up I'm noticing the power transformer is buzzing rather loudly. I am also getting about 1/2 the voltage I expect at the terminal when the "leakage test" button is pressed. This is leading me to look at the power supply sections. I don't see a psu for the high voltage dc that jumps out at me, but obviously it's in there. I'll be calling Sencore Monday about a manual.
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Old 7th June 2010, 12:03 AM   #9
imix500 is offline imix500  United States
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Just an update, I bought a set of schematics and a manual from Sencore. After digging around in the unit I found that someone had cut a trace in the power supply section. Not sure why. The unit now measures and seems to be in the ballpark. It still jumps to flashing "888" sometimes but a power cycle clears it. I still have to check most of the carbon resistors and replace a few more lytic and tantalum caps.
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