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| TC1 lcr-meter transistor-tester fix |
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| distefanom:
Hi indman, I think no. Some weeks ago I broke my TC1 incidentally measuring a charged capacitor, I was sure it was already discharged. I'm a hardware engineer, and I found several damaged components on the testing path, like the protection diodes including DZ1, DZ2 as well the other resistors that go to the uP I/O ports (see the enclosed schematic for reference). Now they're all ok now, and changed the uP Atmega324 so I cannot imagine what else could be if not a FW problem. Maybe I should learn how "compile" the firmware, as you said, to tailor the sources to my TC1 device needs, but at my age, I find a thing really hard to do, starting from zero, as I am. I thought, as I already did with several other appliances, I felt it was way easier to find the already compiled FW and program it inside the micro. But I have to say is really harder than I thought. I'm still in the hope that someone else already has done it, and could kindly link me the firmware he/she used. Many many thanks to those who can help ^-^ ^-^ ^-^ |
| indman:
--- Quote from: belzrebuth on March 19, 2022, 07:11:40 pm ---Mine has a 644 and I think I already have v1.34 somewhere, I was hoping for a newer edition of the m-firmware. --- End quote --- Here is the working firmware for ATMega644 https://www.eevblog.com/forum/testgear/$20-lcr-esr-transistor-checker-project/msg3578117/#msg3578117 --- Quote from: distefanom on March 19, 2022, 07:35:11 pm ---Hi indman, I think no. --- End quote --- But I still think you're wrong! The firmware that I suggested is 100% working and tested on a very large number of clones like yours. Here is another 100% working firmware in Russian(1.41m) for your clone. Try it and if the display shows the same messages as on 1.34m, then your device has a hardware problem. ;) Remove the protective diode assembly DZ2 for a while and check the operation of the firmware without it. I also advise you to check the quality of the soldering of the ATmega324 processor. Very often problems arise precisely for this reason. Check the resistances of each of the processor test ports(PA0-PA2) against +5V and GND. I also do not advise you to check the operation of the device with the USB charging cable connected. |
| distefanom:
Hi indman! quote: "But I still think you're wrong!" Trust me indman, I really HOPE I'm wrong since I would like to recover this device, and not throw it into the bin! All the suggestions you give, like the DZ2 zener, all the protection diodes are already out of the PCB, as well to control the soldering joints of the I/O ports Also there's no problem reading/verifying the uP at all. This evening I'll try you Russian version, and let you know. Thanks 4 the moment :) |
| stefanus:
You forgot to check DZ2, (SRV05-4) ,when you tested capacitor without discharged, DZ2 will protect forward/reverse voltage, and mostly DZ2 will short. ATMega will saved all the time. |
| distefanom:
I removed it already long ago. It still won't work and the micro shows what's in the attached photo- Of course it won't make any measurement |
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