HP 16501A Service Manual

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.
•
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.
TCP, LAN, 16505A Test
This 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 LAN
interface module. Refer to the HP 16500C User’s Reference, chapter 7, for more information
about these 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. 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 remains UNTESTED and the status advisory for the All System Tests changes
from UNTESTED to TESTED.
Theory of Operation
Functional Performance Verification Tests
8–18

HP 16501A Specifications

General

Brand	HP
Model	16501A
Category	Measuring Instruments
Language	English