Service Tools And Utilities - Digital Equipment 3300R Service Manual

Troubleshooting Strategy

Service Tools and Utilities

This section lists the tools and utilities available for acceptance testing, diagnosis, and
serviceability and provides recommendations for their use.
ROM-Based Diagnostics (RBDs)
Many ROM-based diagnostics and exercisers execute automatically at power-up and can
be invoked in console mode using console commands.
Recommended Use: ROM-based diagnostics are the primary means of testing the console
environment and diagnosing the CPU, memory, Ethernet, I/O buses, and SCSI and DSSI
subsystems. Use ROM-based diagnostics in the acceptance test procedures when you
install a system, add a memory module, or replace the following components: CPU
module, memory module, motherboard, I/O bus device, or storage device. Refer to
Chapter 3 for information on running ROM-based diagnostics.
Loopback Tests
Internal and external loopback tests are used to isolate a failure by testing segments of a
particular control or data path. The loopback tests are a subset of the ROM-based
diagnostics.
Recommended Use: Use loopback tests to isolate problems with the COM2 serial port, the
parallel port, and Ethernet controllers. Refer to Chapter 3 for instructions on performing
loopback tests.
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