Instruction manual

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 GPIB.
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 (Agilent 24542G
or Agilent 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.
2 Press Recall (Utility) key until TEST: ALL? is displayed.
3 Press 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.