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Hello,
I switched on my DSO4102C after ~6 months and saw a large offset and ripple noise in both the input channels even without probe. Calibration is stuck on step 6.
NOTES:
- Calibration is always hanging on Step 6. Only way to exit calibration is power off oscilloscope. Even with 1 hour warming and 30 min on step 6... it hangs.
- The offset+noise ripple is present in all scales from 200mV to 100V in both channels (10x probe setting, but no probe connected). Same output in both AC and DC coupling modes.
- In GND coupling mode, the offset + noise goes away and it reads 0V like normal (both channels).
- Everything else works okay. If I feed 5V 1kHz signal, it shows but with offset + noise added over the waveform.
Screenshot of offset and noise, oscilloscope HW/SW version screenshot are attached.
Can you please help?
I can do SMD repair if needed, what part can be damaged?
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