Products > Test Equipment

TC1 lcr-meter transistor-tester fix

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flodo:
DZ2 is probably the most promising part since you seem to have a positive voltage at socket ② - is the diode still working correctly?
You can find a datasheet here: https://www.semtech.com/uploads/documents/srv05-4.pdf

You can get a new one here (at least in Germany): https://www.conrad.de/de/tvs-diode-bourns-cdsot23-srv05-4-sot-23-6-6-v-500-w-1055462.html

Bighouse:
I remember having the device plugged in with an (empty) Capacitor for a maybe a few weeks. Could it be that the capacitor got charged up by having it plugged in, and then releasing it's charge damaging my device in the process? I only hear about 'real' dead devices, with black screens when people plug in a charged capacitor. My issue looks somewhat more subtle.

Will try to measure. All those tiny spots, hope it'll work.

indman:

--- Quote from: indman on July 01, 2018, 12:31:48 pm ---Remove DZ1 = with zener-diode 6V8; DZ2 6-pin marked V05.To give power on a tester without remote elements. If the problem remains, then YOU have damaged the ATMega324 processor. His replacement and a new firmware is necessary. :(

--- End quote ---
Bighouse,already I wrote earlier how quickly to define malfunction.

flodo:
Good idea indman! Yes Bighouse, instead of measuring you can simply remove DZ2 and see if the Tester still shows an voltage.

flodo:
does someone have already dumped the original fw?

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