Service manual

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Service Related Menus
DIAGNOSTIC TEST Menu
7. Service Related Menus
the adapter selection of the analyzer is changed to the “NONE” status.
23: A2 ATT
Checks the attenuator circuit in the A2 which generates the signal level.This test requires
an OPEN termination (42090A) or two BNC cables. It must be done before external tests
24, 25, or 26 are performed. At the end of the test, the adapter selection of the analyzer is
changed to the “NONE” status.
24: A5 NULL FRONT
Checks the input amplifier circuit in the A5. This test requires an OPEN termination
(42090A) or two BNC cables. It must be done before external tests 25 or 26. At the end of
the test, the adapter selection of the analyzer is changed to the “NONE” status.
25: A4/5/6 NULL
Checks the null loop circuit which is constructed by the A4,A5, and A6. This test requires
an OPEN termination (42090A) or two BNC cables. It must be done before external test
26. At the end of the test, the adapter selection of the analyzer is changed to the “NONE”
status.
26: A3 ICH / A4
Checks the circuit in A4 which senses the voltage across the range resistor and transmits
the signal to the A3, it also checks the circuit in the A3 which transmits the signal to the
A8. This test requires an OPEN termination (42090A) or two BNC cables. At the end of
the test, the adapter selection of the analyzer is changed to the “NONE” status.
DISPLAY TEST
These tests are test patterns used to inspect the LCD display. Test patterns are executed by
entering the test number (27 through 31), then pressing
RUN TEST. The test pattern is
displayed and the softkey labels are blanked. After a few seconds, the test pattern is exited
and return to softkey labels.
27: TEST PATTERN 1
ALL Black. This pattern is used to verify the color purity of the LCD Display.
28: TEST PATTERN 2
ALL White. This pattern is used to verify the light output and to check the color purity of
the LCD Display.
29: TEST PATTERN 3
ALL Red. This pattern has the same use as TEST PATTERN 2.
30: TEST PATTERN 4
ALL Green. This pattern has the same use as TEST PATTERN 2.
31: TEST PATTERN 5
ALL Blue. This pattern has the same use as TEST PATTERN 2.