Products > Test Equipment
TC1 lcr-meter transistor-tester fix
madires:
ZD2 (SRV05) is a weak over-voltage protection. The tester works also fine without it, but make sure that you always discharge capacitors before connecting to the tester.
belzrebuth:
Is there a programming header on the TC-1 or should I directly attach wires to the MCU?
I destroyed mine with a charged capacitor and I replaced the atmega but I now need to re-upload the firmware.
With an older tester I needed to solder wires directly to the 328p in order to update it.
madires:
You just need to solder an ISP header (unpopulated footprint at the top).
belzrebuth:
Thanks madires.
Do you maybe have an avrdude command for the atmega 644?
I'm thinking of using the m-firmware.
I don't know what fuse settings I need to set on the ATmega 644.
belzrebuth:
Here are the commands I've gone with; fuses set as follows:
avrdude -c usbtiny -p m644 -U lfuse:w:0xff:m -U hfuse:w:0xd9:m -U efuse:w:0xfc:m
avrdude -c usbtiny -p m644 -U flash:w:ComponentTester-TC1.HEX
avrdude -c usbtiny -p m644 -U eeprom:w:ComponentTester-TC1_eeprom.HEX
I think I've managed to upload the firmware fine since I got a "Bye!" on the LCD.
I then powered the unit with 3.7V on the battery pins but the tester still doesn't work.
The LCD just flashes in white.
I think there's something wrong with my "U4" maybe.
I tried reprogramming that as well but my chip is scratched down and I can't see the markings on top.
I've set various ICs as DUT but no configuaration recognises it..
I've gone with STC15W104, STC15L104, STC15L104W, STC15W104 so far..
My FTDI adapter outputs a VCC of 3.56V instead of 3.3V would this be the fault maybe??
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