User`s guide

CHAPTER 4
MICRODIAGNOSTICS
4.1 INTRODUCTION
Microdiagnostics are the lowest level of diagnostics (level
5) in the V AX-II /730 diagnostic system. These
diagnostics test the system
at the console microprocessor and CPU microcode levels, and should be
executed when higher level diagnostics (levels 4,
3, 2, 2R and 1) are unable to load or execute. They are
the only level of diagnostics that provide for call-out of faulty module(s) for repair.
Digital
Equipment Corporation supplies the microdiagnostics programs on a single TU 58 tape cartridge,
labeled
11725/730 MICRODIAG (TU58 #36), and on the diagnostic distribution media, labeled
V AX- 725/730 CMPLT DIAG. These microdiagnostic programs are divided into two groups of
multiple sections; ENKBx and ENKCx (where x is sections A through G).
NOTE
Throughout the remainder
of this chapter, individual
microdiagnostic programs
will be referred to as
microdiagnostic sections.
The microdiagnostic group ENKBx executes from the console microprocessor
RAM, and tests the
hardware on the WCS (Writable Control Store) and the
DAP (Data Path) modules. The console
microprocessor group sections are listed
in Table 4-1.
Section
ENKBA
ENKBB
ENKBC
ENKBD
ENKBE
ENKBF*
ENKBG*
Table 4-1 ENKBx Microdiagnostic Group Sections
Number
of Tests
1-8
9-F
10-10
lE-26
27-20
2E
* Sections ENKBF and ENKBG are only executed when specifically called out by the section qualifier. These tests are not
executed when the diagnose command, MIC>DI,
is given with no section selected.
ENKBF tests the WCS RAM memory thoroughly using a "march" pattern which takes approximately 5 minutes to execute.
ENKBG tests the remote diagnosis (RD) port on the M8394 board.
It requires a modem loopback connector (H3248 may be
used) on the RD port.
4-1