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ART NUMBER FN091065, REVISION 2 VS5 N AND VS6 N SERVICE MANUAL
Chapter 7 - Diagnostics/Troubleshooting 7-75
PRELIMINARY
7-4-6 Probe Select Board Diagnostic Tests (cont’d)
7-4-6-2-4 ACW Pre-Mixer Gain Test
NOTE: For a description of this test, refer to the information in - "ACW Pre-Mixer Gain Test" on page 7-14.
NOTE: When performing this test, no probe should be connected to the system and nothing should be touching
the probe connectors!
1.) In the Diagnostic Test window, trackball to ACW Pre-Mixer Gain Test in the list of ACW tests
available for selection from the Diagnostic Test Tree (see Figure 7-46 "ACW Pre-Mixer Gain Test"
on page 7-75) and press Set. The ACW Pre-Mixer Gain Test name is displayed under Execute; the
relevant system components to be tested are highlighted light blue in the Schematic View (PIB &
PSB), as shown below:
2.) As indicated in the Special Instructions area, disconnect any probes currently connected to the
system and make sure that nothing is touching the probe connectors.
3.) Adjacent to On Fail, select either Stop or Continue, as required. Stopping on failure enables you
to review a failed test, the moment it fails. Alternatively, you may prefer testing to continue on failure
and later you may review the report.
In order to access an individual board test, it is necessary to insert the service dongle from system boot-
up and enter the Service Password.
It is necessary to disable the Loop option where it should not be used.
After performing this test, you must re-boot the system and perform the DC Offset Calibration procedure
as described in “DC Offset Calibration” on page 7-27.
Figure 7-46 ACW Pre-Mixer Gain Test
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