TroubleshootingProcedures
WFM90D and WFM91D ServiceManual 6-47
Usethis proc edure when
thegraticule is ok, but
thereis no Vector display.
Removethe D isplay module. (For instruments with
serialnumbers below BO20100, removethe Display
moduleand Backlight board. ) Power up the
instrumentand selec t DEFAULTPRESETs from the
CONFIGURE menu. Select Vector display mode.
Isthe
VIDEO
INsignal
OK?
No
Yes
No
Yes
Goto Figure 6--21.
Replacethe Bott om board.
Replacethe
Topboard.
Arethe vector
deflectionsignals
OK?
Checkthe v ector
deflectionsignals
(B-Y/R-Y):
(J9is on the back ofthe
Topboard.)
J9-1= 1.3 Vpp, 2.5 VD C
J9-3= 0.6 Vpp, 2.5 VD C
Checkthe VI DEO IN
signal:
(J14is on the Bott om
board.)
J14-2= 1.3 Vpp, 0 VDC
Figure6 -22: Flowchart for no vector display