Repair task
Electronics repair fault finding with the Rigol DS1054Z
Task: use the oscilloscope to narrow a dead, unstable or intermittent board fault by checking the signals that prove whether the circuit is alive.
Start with power rails
Use channel 1 to check the main rail and channel 2 for a local regulator output. Look for missing rails, excessive ripple, dips during startup or a regulator that oscillates under load. Many repair faults begin with power, even when the visible symptom appears elsewhere.
Check clocks and resets
If the board has a microcontroller, processor or timing device, use another channel to inspect the clock or oscillator. Use a further channel for the reset line. A board may have correct voltage but still fail because the reset never releases or the clock is absent.
Follow the signal path
For audio, analogue, sensor or control boards, compare the signal before and after each stage. The DS1054Z's four channels let you leave earlier reference points connected while moving another probe along the circuit.
What you get out of it
The oscilloscope helps turn a broad fault into a smaller section of circuit: power, timing, reset, input stage, output stage or loading problem.