HP 181A NOTE, NOTE, Enter, TEST LOOP: ON, TEST LOOP: is ON, TEST LOOP to OFF, To Run the Individual Self Tests, Press Enter key to start the test

2

Chapter 2 Service

Troubleshooting the Counter

	To Run the Individual Self Tests
1	Press and hold Recall (Utility) key, then cycle POWER key.
NOTE	If power does not cycle or the display does not light, go to the section titled
	“Power Supply Check” on page 2-45of this chapter.
2	Press Recall (Utility) key until TEST LOOP: is displayed.
3	Ensure that TEST LOOP:OFF is displayed.
	Note that the DISP? and KEYPAD? tests are not available if
	TEST LOOP: is ON.
	If TEST LOOP: ON is displayed, press any one of the arrow keys to set
	TEST LOOP to OFF.
4	Press Recall (Utility) key until TEST: ALL? is displayed.
5	Press any one of the arrow keys to select the desired self test
	(for example, the DISP? self test).
6	Press Enter key to start the test.
	After a test is completed, a pass or fail message will be displayed.
NOTE	After the DISP? (Display) test has cycled through each display segment
	and annunciator, press the Enter key to stop the test and to display the
	pass or fail message.

7If you are asked to do something, press Enter key when you have completed the requested task.

After a test is completed, a pass or fail message will be displayed.

2-50 Assembly-Level Service Guide