M6013 capacitor tester

[Broblack!!!]

Hi all...im steven.
I hv a quick qustion....ihv this chinese cap tester which went kaput when i tested it without discharging it....now all it does is just show OL...

so ive been poking ard n found a smd resistor which is 514 a 510kohm resistor.
So when i tested it with my DMM it showed me 0.510Mohm!! So am i right to say its off?? N thats the perhaps cause for my meter to show OL.

btw...im using a new capa to test the meter.

Im just begining in electronics so im not a pro.pls help me guys...thanks a million

 

[Broblack!!!]

Hi all...im steven.
I hv a quick qustion....ihv this chinese cap tester which went kaput when i tested it without discharging it....now all it does is just show OL...

so ive been poking ard n found a smd resistor which is 514 a 510kohm resistor.
So when i tested it with my DMM it showed me 0.510Mohm!! So am i right to say its off?? N thats the perhaps cause for my meter to show OL.

btw...im using a new capa to test the meter.

Im just begining in electronics so im not a pro.pls help me guys...thanks a million

 

[Harald Kapp]

514Ω = 51*10^4Ω=0.51*10^6Ω=0.51MΩ which isxactly what you measured. This resistor seems to be o.k.

 

[shrtrnd]

Your meter was designed with self-protection in-mind.
You may have fried a component in the measuring circuitry, but you most likely blew a fuse or a resistor in the
circuit attached to the input probe terminals. Check continuity in the fuses, look for a physically damaged resistor,
and if you don't see anything check the circuit board for any other damaged components, before you start worrying about if you damaged the measurement circuitry itself.

 

[Broblack!!!]

thanks for the reply...yes I have checked the pcb for physical damage or fuse n nothing that I can see with my naked eye...I cant find any circuit diagram in the web as well let alone find the manufacturer or its details (bought it in ALIEXPRESS) so I again started poking ard n found some resistors under value.. pls bear with me guys.

oh BTW these are SMD so I just used my DMM to test it without taking it out of the circuit but I have seen in youtube n read in the net that you can measure the resistors while in circuit but if for sure results lift a leg or remove it from the board. but being smd its gona be tough..(for now)

these are the values: 30F=20mohm reads 16Mohm but if I turn the leads ard it reads 19++Mohms (see pic with the probs interchanged).
301=300ohms reads 288ohms both ways (5% tolerance is 285)
102=1kohms reads 909 ohms both ways

I knw for sure there is NO polarity in resistors so could this be the faulty ones?? Also why does the 20mhoms one read 2 different reading on the DMM? I'm using a fluke 17B DMM.

 

[Broblack!!!]

Guys?? Way too quiet in here....

 

[Kel]

Guys?? Way too quiet in here....

Hi, just got here with a similar problem. Hope it's not to late to help some. On the back side of that board is a zener diode that was blown on mine. After replacing it, It will test capacitors now but still having problems with it zeroing.

 

[shrtrnd]

I don't know if you've got a schematic. You probably need to adjust a pot after replacing the zener to get back to zero(?)

 

[Kel]

I don't know if you've got a schematic. You probably need to adjust a pot after replacing the zener to get back to zero(?)

That might be it. I couldn't find a schematic anywhere so not sure how to set it.

 

[shrtrnd]

I'd check the components in-line with that zener. A high enough current to zap the zener would probably take-out something else in the circuit that could cause the unstable zero. THEN I'd recheck to see how far off your zero might be.

 

[Kel]

I'd check the components in-line with that zener. A high enough current to zap the zener would probably take-out something else in the circuit that could cause the unstable zero. THEN I'd recheck to see how far off your zero might be.

I found a bad capacitor, 10v 1000 uf. Tested at 486 uf So replaced it with a 16v 1000uf, it was a longer capacitor so was a little tricky getting it to fit in such a tight area. But that also didn't fix the problem yet. If I find more I'll keep you posted. When zeroing it says I need to open the leads even with the leads out.

 

[shrtrnd]

Good luck with your troubleshooting. A lot of guys here are probably unable to find your schematic too, and we're a lot more helpful when we have a schematic in front of us. Sorry for the guess-work here, but I'm sure anyone here with a good idea will add it in following posts.

 

[kellys_eye]

As I understand those testers to work they rely on using the capacitor under test in a charge/discharge circuit based around the analog input of an ADC in the microcontroller - understandably you have to have a DISCHARGED capacitor as those inputs are invariably limited to 5V maximum.

If you connect a charged capacitor and you feed more than 5V into the ADC you blow the guts out of it...... hence the warning to ensure they are discharged before measurement and the consequent 'fault' (irrepairable other than changing the microcontroller).

Even if you could fit a new processor you would have to have a programmed one - good luck in sourcing the code!

Time to chuck it in the bin and learn from the lesson.