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Chapter 2 Service
Troubleshooting the Counter
Assembly-Level Service Guide 2-49
2
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
1 Press 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.