Theory of Operation
Functional Performance Verification Tests
Possible problems causing a failed message in either the flexible disk drive or hard disk drive include the following:
•A damaged or disconnected disk drive cable.
•Wrong disk formatting or no disk formatting.
•The disk
•A faulty disk drive.
•Faulty microprocessor board interface circuitry to the disk drive.
For Flexible Disk Test failures, verify the continuity and connection of the disk drive cables, use formatted disks, and set the write protect tab on the disks to the unprotected position.
Intermodule Test
The Intermodule Test checks the functions of the intermodule timing correlation. This test fails if there are any connections on the input BNC. For Intermodule Test failures in a mainframe, you can suspect a faulty microprocessor board. For Intermodule Test failures in a mainframe connected to an expansion frame, you can suspect a faulty mainframe interface module.
The Intermodule Test screen shows the mainframe and expansion frame card slots and the card identification code of the module located in each slot.
Color Display Test
The Color Display Test puts screen patterns and color screens on the monitor. This test is mainly used to check for color purity. Usually, the purity problem can be solved using a degaussing coil. If some pixels are not colored, then there is probably a problem with the Display RAM on the microprocessor board. For Color Display Test failures, degauss the display. Refer to chapter 2, "Preparing for Use," for degaussing instructions. If the Color Display Test still fails, you can suspect a faulty microprocessor board or a faulty color display monitor.
Option Board Test
The Option Board Test is used during troubleshooting to check the data and control signals through the HP 16501A expansion frame components. This test also verifies the functionality of the HP 16500L LAN interface module. Refer to the manuals for the HP 16500L for more information about the LAN interface tests.
All System Tests
The All System Test will perform all the tests listed on the screen on the Mainframe Test menu, except for the Color Display Test and the Expander Test. When the tests are complete, the status advisory for each test changes from UNTESTED to PASSED or FAILED. The status advisory for the Color Display Test and for the Expander Test remains UNTESTED and the status advisory for the All System Tests changes from UNTESTED to TESTED.
