3 . The Housekeeper IC Test verifies
functionality
the Housekeeper IC.
The
IC performs many
chores of the amplifier,
including channel sequencing, refreshing the analog control voltage system,
latching amplifier step gain settings, and the communications with the main-
frame. This test exercises lhis
and records
reactions using an algo-
rithm similar to the algorithm that signature analysis uses. If the resulting sig-
nature of the Housekeeper IC does
not
match a known
good
signature, then
the test fails and
a fault code of 3.
Also, the test is executed repeatedly
if it fails. The instrument continues looping the Housekeeper
until
power is removed. Until the condition causing the Housekeeper IC Test to fail
the mainframe does not recognize the plug-in.
After all power-on
Tests have completed and successfully passed, the
plug-in initializes its
and communicates with the mainframe.
Self-Test/
First, the plug-in must successfully power-up, initialize its settings, and establish
Extended
communication with the mainframe. Then, the mainframe requests that the plug-in
Diagnostics
execute its Self-Test routines (unless the mainframe’s Self-Tests are disabled, in
which case all the Self-Tests
ignored). Return
normal operation or entry into
the New Configuration calibration, as discussed below, indicates successful comple-
tion of
Diagnostics. Any failures cause the instrument to display the
tended Diagnostics menu. Record the displayed error codes for the failed circuit
block(s). You may have to step through several pages of the menu
to find all
the failure codes.
The format of the error index codes is based on
Extended Diagnostics menu
structure. The Extended Diagnostics menus are in a three level hierarchy with the
Block menu at the highest level. Each plug-in is one Block. A Black is broken into
a number of parts or circuit areas in the
menu, the second level. Touching
Area label at the bottom of the menu displays the Area menu for the selected Block.
Each circuit Area has a Routine menu, the third level, associated with it that has one
or more
Routines. Routines are the smallest test units that are
and tunable. This Block, Area, and Routine menu hierarchy
the error
index codes.
Diagnostics error
codes are five digit codes whose first character in-
dicates the subsystem or plug-in
tested. The
four digits are hexadecimal
(hex) numbers
that
indicate
the
Area, Routine and specific failure mode. For
example,
is decoded as follows:
R
Right Plug-in
Block name plug-in
2
Area name Group I
4
Routine
Checksum Probe
1
Failure Identity specific failure mode
The subsystem character of an error index code is one of the following, and indicates
compartment in which the plug-in is installed. In the tables in this section, only
the four digit failure code is listed; the
L, C, or R is omitted.
L
C
R
-Right
3-24
Service Reference
Summary of Contents for 11A32
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