Chapter 2 Service

Troubleshooting the Counter

 

INTERP? —test interpolators.

 

KEYPAD? —request user to press all keys. Note, this test is not

 

available if TEST LOOP: is ON. TEST LOOP: must

 

be OFF.

 

PRINT? —send three test lines to a printer via the RS-232.

 

If in talk-only, also send three test lines to a printer

 

via the HP-IB.

 

 

NOTE

When running the TEST LOOP self-test routine, be sure to connect the

 

Counter to a serial printer via the RS-232 using a RS-232 printer interface

 

cable (HP 24542G or HP 24542H) to receive more specific failure

 

information. If you run the TEST LOOP test without Counter being

 

connected to a printer, the Counter will only display pass or fail message.

 

Diagnosing the Faulty Assembly by Using the

 

 

Self Tests

 

To Run the Test-All Self Test

1Press and hold Recall (Utility) key, then cycle POWER key.

2Press Recall (Utility) key until TEST: ALL? is displayed.

3Press Enter key to start the test.

The counter will display the tests as they are being performed. When the tests are completed the display should show ALL: PASS.

If the fail message is displayed, run the appropriate individual test as described in the following sub-section. If the individual test fail, use Table 2-5 to determine which board or assembly you should replace.

2

Assembly-Level Service Guide

2-49

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HP 181A manual Diagnosing the Faulty Assembly by Using, Self Tests, To Run the Test-All Self Test