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Service
Model 11848A
Running the Diagnostic Program
The Diagnostic program is independent of the main System software. To run the Diagnostic program:
1. Gather and connect the equipment. You will need, in addition to the faulty Interface, the following
equipment:
• HP 3561A Dynamic Signal Analyzer (preferably the one in the System),
• HP Series 200 or 300 Computer with disc drive and HP-IB, and
• optionally, a printer compatible with the System Controller.
2. Reset the computer. If the computer is not running BASIC, boot up BASIC 4.0. (BASIC 4.0 is
the supplied operating system. BASIC 2.1 and 3.0 will also work.)
3. Key in L O A D "Diagnostic
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and press RUN.
4. If a display appears which indicates that the HP 3561 A, HP 11848A, or printer HP-IB addresses
are not correct, you can (1) physically change the address of the device to match the displayed
address or (2) change the displayed address of the device using the cursor control keys (the knob,
arrow keys, tab keys, backspace key, or space bar); then press ENTER. If the display still indicates
an incorrect address, then the device does not respond when it is addressed. (It may be broken
or turned off.) If a printer is not available, it can be deleted at this time.
5. The display will now show the Task Selection menu screen. This is the main screen for the
Diagnostic program. The program is now ready for troubleshooting the Interface.
Features of the Diagnostic Program
Most explanations you will need to use the program are part of the program itself either as prompts
on the bottom line of the display or as entire displays of information.
Softkeys are not used in the program. Instead, highlighted (inverse video) characters are displayed;
pressing a key matching the highlighted character initiates the selected action. Very often the letter
"F in the word "Information'' will be highlighted. Pressing "F immediately brings on to the display
information pertinent to the current display. Use it often. It is the Operating Manual for the Diagnostic
program.
The Diagnostic program is referenced to the Block Diagram found herein. Refer to it frequently.
The program has two basic modes of operation.
• It runs tests, displays results, and in many cases will attempt to pinpoint the failure.
• It gives you arbitrary control over any programmable circuit device in the Interface.
When you use the Diagnostic program to troubleshoot the Interface, the normal procedure is:
1. Run tests which you think might locate the fault. (When running the test for the first time,
respond with "No" when prompted "Stop on failure?".)
2. When a failure is noted in a test, rerun the test and request stopping when a failure is detected.
When stopped, request to view the Interface setup.
3. The display will now show the current state of the Interface and enables you to alter the state
to check the functioning of a suspected circuit. Often a faulty control line will cause a circuit to
malfunction. To check for this,
• Press the key corresponding to the desired type of the circuit. (For example, press "A", for
"Attenuator", if one of the programmable amplifiers is to be checked.)
• Now press "F to display the information for the circuit type (for example, programmable
attenuators). The information will show the logic control states of all the circuits of that
type. (At this point, if a printer is attached, you may wish to print the information display.)
• Now return to the previous screen (press "X", for exit) and follow the logic levels through
the control circuits to the (Al) control assembly.
4. Once the faulty circuit or control line has been isolated, you can continue isolation to the faulty
component or replace the faulty assembly. (Some assemblies are on an exchange program.)
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