Roger: what is the purpose of 100k potentiometer in your ESR diagram? what will be the settings, for now I started to assemble the ESR tester… it’s almost done…the IC TL062 or TL072 is lacking,,, it’s hard to find the ic…but I’ll try other electronics stores …
Humphrey: The 100K pot is like the zero adjusts of your analogue meter. So it will be used to adjust to zero when using the esr meter attached to your analogue meter. Please try and get any of these two ic...they are very cheap in the market.
Roger: sir, good day…I finish assembling the esr…but when I switch ON, only little flick…when I short the two leads at the esr… no movement…I used ceramic disc caps,,102m,,,104m,,, is this right sir? I check the vcc pin of ic TL062,pin 8 there is 5 volt there, but I wondering why that no movement or not functioning…I check also the ic pins 5-6-7-8,,jumper,,pls,advise me sir...thanks
Humphrey: That little flicker is ok...now try to turn the P.O.T knob all the way with the two probes shorted together and see if it goes to zero and come back to me. The 102 and 104 are ok..best of luck.
Roger: Sir, I try your advise no effect even though I adjust the pot 100k ohms…
Humphrey: Let me have the picture of your assembled circuit both bottom and components side (main esr circuit only)
Humphrey: your pictures are not clear but I am able to pick some few things...
1. Did you cut the 4 track on the underside of the ic 4 pins...i can’t see them.
If they are not that means the ic is doing nothing because it is just shorted on the 4 pins...
2. I can’t see the jumper wire from pin 8 of the ic to 100 K resistor.
3. I see jumpers on the underside what are they doing there.
Finally let me say this…This circuit which I reproduced here is the one I used to make mine and I have not added or subtracted anything and so it should work.
Please note my template is the road map. You should follow it the way it is...
Please if you think you have not followed the template to the letter you can start again because i see the ic is on socket and therefore you can always re-use it...
Again after assembly you will get something like the one I have done because I used the same template to do mine.
Roger: Good news sir, the esr is working now…I analyzed what you have advised…I think I mislead the jumper at the bottom of ic…, when I looked at the diagram…so I immediately cut the jumper at pins 5,6,7,8,,,is shorted….after that i test its viola sir….thanks for your support sir, I really appreciate…God bless you…,now I can practice testing bad caps……
Compiled by Humphrey Kimathi
Author CRT Television repair course
