Power On Sequence Troubleshooting; Check The Line Voltage And Fuse; Check The Power Supply Unit Output - Keysight E4980A Service Manual

Troubleshooting

Power On Sequence Troubleshooting

Power On Sequence Troubleshooting

Check the Line Voltage and Fuse

Check the main power line cord, power fuse, and actual line voltage to see that
they are all correct. For more information about the line cord and power fuse,
see the Power Requirements in Appendix B.

Check the Power Supply Unit Output

Step 1. Remove the E4980A/ E4980AL's outer cover.
Step 2. Turn the E4980A/ E4980AL power on.
Step 3. Measure the output voltage (+3.3, +5, +12, -12 V) of the power supply unit
using a voltmeter with a small probe. The location of each voltage connector
on the A1 board and A3 board is shown in
32
Figure 4-2.
Keysight E4980A/E4980AL Precision LCR Meter