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Troubleshooting the IF Section
Troubleshooting the A15 Motherboard Assembly
Troubleshooting the A15 Motherboard
Assembly
Use this section to identify and locate all the signals and voltages that
pass through the A15 motherboard assembly. The location of active
components on the motherboard are also provided.
The following information is provided in this section.
•
Figure
5-1, A15 Motherboard Connector Designation. Shows the
location and reference designator for each connector on the
motherboard.
•
Figure 5-2
and
Figure 5-2
Associated Circuitry. Provides a simplified circuit diagram for the
components on the motherboard. To help locate the components, the
motherboard connector-pin that is connected to each component is
shown.
•
Figure
5-3, A15J13 Connector-Pin Designation. Provides the pin
numbering sequence for the connector that connects the A8 power
supply to the motherboard.
•
Figure
5-4, Card-Cage Connector Pin Designation. Provides the
pin-numbering sequence for the four motherboard connectors in the
card cage. The motherboard connector for the A7 analog interface
assembly (not shown) has the same pin-numbering sequence, but is
installed in a position that is reversed when compared to the
card-cage connectors.
•
Table
5-6, A15 Motherboard Mnemonic Descriptions. Provides the
mnemonic, full name, and functional description for each signal and
voltage on the motherboard.
•
Table
5-7, A15 Motherboard Pin Designations. Identifies the signal
or voltage distribution for each signal and voltage on the
motherboard.
Each column identifies the instrument assembly that is connected to
the A15 motherboard. The associated motherboard reference
designator for each assembly is also supplied.
The mnemonics from
on the left-hand side of the table.
For a given mnemonic, read across the row to find all the assemblies
that the signal or voltage is connected to. The A15 connector pin
numbers in each box indicate the A15 connector pins where the
signal or voltage appear.
Be sure to read the footnotes at the bottom of
266
A15 Connectors with Additional
Table 5-7
are arranged alphabetically by row
Table
5-7.
Chapter 5
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Troubleshooting
