Troubleshooting the Controller/Display

Parallel Bus

Parallel Bus

The parallel bus is at the center of the control section. The parallel bus is defined as direct connections to the A7 Controller. These connections include the data bus, address bus and dedicated parallel control lines.

The assemblies on the parallel bus are:

•A1 Keyboard

•A6 Signalling Source/Analyzer

•A7 Controller

•A8 Memory

•A9 Global Test/Demod

•A19 Measurement Board

•A20 CRT Driver

•A21 GPIB Interface

•A32 GSM Controller

•A33 Hop Controller

Most problems with the parallel bus are accounted for in the power-up self-tests. The self- tests check the A7 Controller first, then the A8 Memory. If these two tests pass, the instrument will beep once after approximately 10 seconds. If these tests do not pass, the problem is probably on one of the two boards or something is pulling down the parallel bus.

The assemblies that are not directly checked by the power-on self-tests are the A1 Keyboard and the A21 GPIB Interface.

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Agilent Technologies 8922 manual Parallel Bus
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8922 specifications

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