6Ć79
This section provides the information necessary to troubleshoot a faulty
CSA 803A to the fieldreplaceable unit (FRU) level. In most cases a FRU is a
circuit board. The primary means for troubleshooting is to use the error
index code output from the Kernel diagnostics and crossĆreference it to the
suspect circuit boards in the following tables, or to use the builtĆin FRU help
function available in Extended Diagnostics. In addition, conventional troubleĆ
shooting techniques are describedat the endof this section to help identify
a faulty A4 Regulator board, CRT, Power Supply module, A13 Mother board,
or A8 CRT Driver board.
Each subsystem processor (Executive, Display, Time Base, andAcquisition)
executes a set of Kernel diagnostics prior to the SelfĆTest diagnostics. After
the Acquisition processor has verifiedits support circuitry, it tries to establish
communication with the Time Base processor. After the Time Base procesĆ
sor has verifiedits critical support circuitry, andafter it has attemptedto
communicate with the Acquisition processor, the Time Base processor
attempts to communicate with the Executive processor. Likewise, the DisĆ
play processor attempts to communicate with the Executive processor after
successfully executing its Kernel diagnostics.
After a processor has successfully completedits Kernel diagnostics and
establishedcommunications with the next order processor (for example,
AcquisitionĆtoĆTime Base andTime BaseĆtoĆExecutive), then SelfĆTest diagĆ
nostics execute to verify the more global functionality of the processor's
hardware system. After all the SelfĆTest diagnostics are executed, any failĆ
ures cause the CSA 803C to enter ExtendedDiagnostics andto display the
error index codes in a diagnostic menu. Extended diagnostics contains tests
which are a superset of the SelfĆTest.
The Kernel diagnostics (lowĆlevel SelfĆTest diagnostics) and SelfĆTest/ExĆ
tended Diagnostics produce and format error index codes differently, so
they are covered separately. Kernel diagnostics error index codes for each
subsystem are producedandreadquite differently from each other.
Note that some of these tests that may indicate faulty FRU(s) are not
executed automatically during the SelfĆTest diagnostics (that is, some errors
codes are only generated by manually selecting tests or Extended DiagnosĆ
tics).
Summary of Contents for CSA 803C
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