User guide

1
Troubleshooting and Diagnosing Problems
This chapter describes the troubleshooting procedure that you can use to solve
basic problems with VAX 4000 Model 105A and Model 106A systems.
1.1 Troubleshooting Procedure
If a problem occurs, you must first make sure that all the cables, loopback
connectors, and terminators are correctly connected and that the connectors
are not damaged, for example, the pins may be broken or short-circuited.
Follow these steps:
1. Shut down the operating system following the procedures described in the
operating system documentation.
2. Turn off the console terminal and all the peripheral devices such as
printers and modems.
3. Turn off all the expansion boxes.
4. Turn off the system unit.
5. Check that the following cables, if installed, are correctly connected at both
ends and that the connectors are not damaged:
• Console terminal cable (linking the console terminal to the system unit)
• Console terminal power cord
• System unit power cord
• Expansion box SCSI cables
• Expansion box Q–bus cables
• Expansion box DSSI cable(s)
• Expansion box power cords
• ThinWire™ Ethernet cable or standard Ethernet cable
Troubleshooting and Diagnosing Problems 1–1