Troubleshooting Procedures
6–42 WFM 90 and WFM 91 Service Manual
Use this procedure when the graticule
and menu are bad, but the PIX mode is
ok (moderate to severe vertical flutter).
No
Yes
Perform the Raster VCO
adjustment, if possible, in
the Adjustment procedures.
Check the Raster VCO control
signal:
(J9 is on the Top board.)
J9-6 = Approximately 10 mVDC
Is the
Raster VCO
control signal
ok?
Replace the
Top board.
Replace the Bottom board.
Figure 6–22: Flowchart for bad graticules and menus