TroubleshootingProcedures
6-52 WFM90D and WFM91D Service Manual
Replacethe
Bottomboard.
Are
allof these
signals
correct?
Replacethe
Displaymodule.
Usethis proc edure when
thedisplay is all white.
Removethe D isplay module. (For instruments with serial numbers
belowBO20100, remove t he Display module and Backlight board.)
Connectthe AC Adapterand power up the inst rument.
No
Yes
Checkthe D isplay drive signals:
(ProbeJ16 from the bac k of the Bottom board.)
J16-9= +1 to +3 VDC as VIEWis adjust ed in the CONFIGURE menu.
J16-10=( DSYNC) 0 t o 0.6 V compsync
J16-14= (SEL_EXVID) +5 VDC inPIX mode/0 VDC inWaveform
mode
Selectthe PIX M ode, No Menu,
(Use100% flat f ield test signal.)
J16-6= (B) 2 VDC blanking level/ 2.5 V peak video
J16-7= (G) 2 VDC blanking level/ 2.5 V peak video
J16-8= (R) 2 VDC Blanking/ 2.5 V peak video
SelectWFM Mode+ MENU
(Use75% color bar signal. )
J16-2= (B) 0 to +1.3 V
J16-3=(G)0to+1.3V
J16-4= (R) 0 to +1.3 V
Figure6 -27: Flowchart for all white display