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IRECTION FQ091019, REVISION 2 VIVID Q N SERVICE MANUAL
7-72 Section 7-4 - Performing Front End (FE) Diagnostics
7-4-5-2-4 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-
13.
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 7-45 below) 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 (P&M), 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.
4.) Trackball to the Start button and press Set.
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 7-25.
Figure 7-45 ACW Pre-Mixer Gain Test
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