User manual

Troubleshooting Guide
220
8.2 General Problems
If there is no display on the screen:
• Check that the power cord is connected to the
oscilloscope and to a live power source.
• Check that the power switch is on.
If there is no waveform displayed:
• Check that the oscilloscope probe is securely inserted
into the connector assembly and that the probe clips
make good contact with the probe lead wires.
• Check that the probe clips are securely connected to
points in the circuit under test and that the ground is
connected.
• Check that the circuit under test is powered on.
• Press the AUTO key again.
If the waveform display is not stable:
• Check that the trigger source channel is actually the
channel to which the trigger signal is connected.
• Check that the proper trigger type is selected. Video type
is only used to trigger a Video signal. Proper trigger type
is essential to acquire a stable display.
• Try to use the HF Reject or LF Reject to reduce the noise
of the trigger signal.