Filter
Top Products
Troubleshooting Procedures
WFM90D and WFM91D Service Manual
6-47
Use this procedure when
the graticule is ok, but
there is no Vector display.
Remove the Display module. (For instruments with
serial numbers below BO20100, remove the Display
module and Backlight board.) Power up the
instrument and select DEFAULT PRESETs from the
CONFIGURE menu. Select Vector display mode.
Is the
VIDEO
IN signal
OK?
No
Yes
No
Yes
Go to Figure 6--21.
Replace the Bottom board.
Replace the
Top board.
Are the vector
deflection signals
OK?
Check the vector
deflection signals
(B-Y/R- Y):
(J9 is on the back of the
Top board.)
J9-1 = 1.3 Vpp, 2.5 VDC
J9-3 = 0.6 Vpp, 2.5 VDC
Check the VIDEO IN
signal:
(J14 is on the Bottom
board.)
J14-2 = 1.3 Vpp, 0 VDC
Figure 6- 22: Flowchart for no vector display