HP 4395A - Page 194

Internal Tests Failure Troubleshooting
Check the Power-On Selftest
The analyzer performs the power-on selftest every time when the analyzer is turned on. In the
power-on selftest, some built-in internal tests are executed sequentially. The rst failed test
indicates the most probable faulty assembly and you should be replaced.
If the power-on selftest fails and \ POWER ON TEST FAILED " message is displayed, execute all
internal tests to identify the rst failed test. Refer to the following steps to execute all internal
tests. Then refer to the Table 6-1 to know what assembly you should replace.
Execute All Internal Tests
If the power-on self test fails and \ POWER ON TEST FAILED " message is displayed, you should
execute the all internal tests and identify the rst failed test. To execute all internal tests, you
should specify test number as 0 in the HP 4395A service tests mode.
a.
Press 4
PRESET
5 , 4
SYSTEM
5 ,
NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN
SERVICE TESTS , 4
0
5 , and 4
x1
5 to access the internal test 0: ALL
INT.
b. Press
N
NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN
EXECUTE TEST to execute the ALL INT test.
c. Wait until the test result, PASS or FAIL, is displayed.
d. Press the 4
*
5 , 4
+
5 keys to nd the rst occurrence of a F
AIL message.
Execute the Individual Test
If you would like to perform the internal test individually
, you should specify internal test
number in the HP 4395A service tests mode.
a. Press 4
PRESET
5 , 4
SYSTEM
5 ,
NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN
SERVICE TESTS . Pressing
NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN
INTERNAL TESTS jumps to the rst test
internal test, test:0 ALL INT.
b. Select the test using the RPG knob, 4
*
5 , 4
+
5 keys or ENTRY keys.
c.
Press
NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN
EXECUTE TEST to execute the specifyed test.
d. Wait until the test result, PASS or FAIL, is displayed.
Note
Internal test 1, 2, 3, 7, 17, 18, 38 and 39 are not executed in the power-on
selftest. You should perform these tests by specifying test number or by
executing all internal tests.
6-6 Troubleshooting