Products > Test Equipment
TC1 lcr-meter transistor-tester fix
digik:
everything stays cool. is there a schematic for this specific version? btw i have tested everything and no component seems shorted...except the MCU. I will desolder the MCU and see if the short goes away
digik:
short is gone after removing the MCU. In the bin the thing goes.
acerquax:
Hello all,
my name is Harry
I am new here and I am impressed of all this good ideas, repairing this "tiny" tester. Great stuff!!
I read this threat very thoughtful, but I am a bit unsure how to handle my killed tester?!
I did exact the same as many others:
Forgotten to discharge a condensator, tried to measure capacitance on my T7 and "PENG". |O
The result:
I switch it on, the display shows as usual Testing.... and after a while it shows some voltage sometimes between Pin 1 and 2 and sometimes between 2 an3 a.s.o.
I guess my ATmega324 has got some spike and is death.
So I have to replace it, but what do I have to flash, only the 324 or the 15L104 as well?
I don't understand the function of the 15L104. :-//
Why do I have to flash it as well?
Can I get an idea here in this threat where to find an original firmware copy ?
Many thanks in advance
Harry
madires:
If you got a copy of the T7's modified firmware (flash and EEPROM) you would only need to program the replacement ATmega since the STC15L104W still works. The STC15L104W is an additional MCU which controls power and the test button which makes that tester incompatibile with the standard design. The alternative is to go for an OSHW firmware and also reprogram the STC15L104W with an alternative firmware, or to replace it with a simple two-transistor circuit.
acerquax:
Thx for your infos. great!
Where can I get a copy of the t7 firmware from?
I couldn't read out the firmware from my atmega 324, it was blocked.. :horse:
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