7. Signal Generator Fault Diagnosis and Troubleshooting

7.1 Standby Light Not Working

• Step 1: Check the AC switch state, the AC power, and the external circuits.
• Step 2: After troubleshooting, re-power on the equipment.
• Step 3: If the standby light still not working, check if the fuse blown, if yes, replace the fuse and power-on again. 
• Step 4: If the fault was caused by the power supply of the signal source, it needs to be returned to and repaired by the manufacturer.

7.2 Fan Not Working

• If the fan doesn’t work in power-on state, check whether the fan is stuck by obstacles.
• If yes, turn off the equipment to remove the obstacles and clean the fan. 
• If the fault still not solved, please return the equipment to the manufacturer for Maintenance.

7.3 Keyboard Not Working, Key Ghosting / Key Chatter

If the fault occurred in power-on state, please return the equipment to the manufacturer for Maintenance.

7.4 USB Device Not Recognized

• Step 1: Check if the U disk works in other equipment or computers.
• Step 2: If yes, reset the equipment and insert the U disk again.
• Step 3: If the fault still not solved, please return the equipment to the manufacturer for Maintenance.