EEVblog Electronics Community Forum
Electronics => Repair => Topic started by: amir.razzaqi on July 19, 2023, 09:01:59 am
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Hello guys
I have a Victor VC97 DMM that I have not used it since last year, (I stored it without battery). I wanted to use it couple days ago and when I insert a new 9.0V battery the multimeter backlight turned on and the buzzer start buzzing and LCD showed "ERR 0" I remove battery and insert again for a few times and the same thing happened (the error sometimes changed to "ERR 1") after that the error goes away but the multimeter din not work in most ranges (only continuity test and frequency meter and capacitor meter in nano farad ranges works). I checked the fuses and 3.3v regulator and EEPROM all was OK. Now I don't know where to start.
I appreciate anyone with any advice.
the board photos: https://drive.google.com/drive/folders/10y5x8bgkodZpZq_Hk_wPlbiRgFQvfxP7?usp=drive_link
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Is this related to your other VC97 (mV) thread? You say the EEPROM is ok, have you been trying to read the contents without proper voltage level translation (I think you used 5V in the other thread). I'm wondering if it caused more damage on this meter than the other one.
https://www.eevblog.com/forum/chat/dmm-problem-in-dc-millivolts-range/ (https://www.eevblog.com/forum/chat/dmm-problem-in-dc-millivolts-range/)
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Is this related to your other VC97 (mV) thread? You say the EEPROM is ok, have you been trying to read the contents without proper voltage level translation (I think you used 5V in the other thread). I'm wondering if it caused more damage on this meter than the other one.
https://www.eevblog.com/forum/chat/dmm-problem-in-dc-millivolts-range/ (https://www.eevblog.com/forum/chat/dmm-problem-in-dc-millivolts-range/)
No, I have two of them. I compare both EEPROM (after the first one stop working) and only 24 byte of 256 byte was different. This bytes maybe related to calibration issue.