Rohde & Schwarz SMR20 signal generator failure case after maintenance

1. Instrument Model

Rohde & Schwarz Signal Generator SMR20

2. Fault phenomenon

Black screen and no boot

3. Maintenance and Inspection

After the instrument arrived, the engineer first verified the instrument fault. After the power-on test, the instrument screen was black and could not be turned on normally, but the keypad light was on. This phenomenon proved that there was no problem with the instrument powering on, and the power board was ruled out. Next, the instrument was disassembled for inspection. After checking one by one, the fault range was locked on the control board, and it was found that multiple components of the instrument control board were damaged.

4. Repair and treatment

After confirming the fault, replace the damaged components of the control board and inspect the whole machine.

5. Repair results

The instrument starts up normally, self-test passes, self-calibration passes, and the measurement signal is normal.