W A R N I N G
Troubleshooting
To test the hard disk drive voltages
To test the hard disk drive voltages
Refer to chapter 6, "Replacing Assemblies," for instructions to remove or replace covers and assemblies.
Hazard voltages exist on the power supply, the CRT, and the CRT driver board. This procedure is to be performed by
Equipment Required
Equipment | Critical Specification | Recommended |
|
| Model/Part |
Digitizing Oscilloscope | > 100 MHz Bandwidth | HP 54600A |
1Turn off the instrument, then remove the power cable. Remove both the top and bottom covers of the mainframe and set the mainframe on its side with the strap handle facing up.
2If an HP 16500L module is installed, then remove it from the mainframe.
a Disconnect the three cables plugged into the HP 16500L by reaching through the top of the mainframe and removing the plugs.
b Remove the screws attaching the HP 16500L to the mainframe. Refer to chapter 6 for more complete instructions to remove the HP 16500L.
3Remove the four screws holding the hard disk drive and let the hard disk drive hang by the power and the data cables. Do not let the hard disk drive contact the CPU board.
4Connect the power cable and apply power to the mainframe. When the hard disk drive begins spinning, ensure the disk drive does not contact the CPU board. When the mainframe has powered up, enter the Test System.
5When the System Test menu appears, select Mainframe Test, then select Disk Test. When the disk test menu appears, select
6Using an oscilloscope, check for activity on the pins. Probe the voltages on the hard disk drive circuit board where the data cable connector is soldered. Pin 1 of the connector is marked on the circuit board and is on the side of the connector closest to the power cable.
