GE
D
IRECTION
FQ091019, R
EVISION
2
V
IVID Q
N S
ERVICE
M
ANUAL
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-
.
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
) 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
