TroubleshootingProcedures
6-50 WFM90D and WFM91D Service Manual
Replacethe Top board.
Replacethe
Bottomboard.
Arethe
Displaydrive
signals
OK?
Checkthe D isplay drive signals:
(ProbeJ16 from the bac k of the Bottom
board.)
J16-6= (B) 2 VDC, 2. 5 V peak video
J16-7= (G) 2 VDC, 2. 5 V peak video
J16-8= (R) 2 VDC, 2.5V peak video
Isthere a
displayin any
otheroperating
mode(except
WIP)?
Checkthe SEL_EXVI DEO signal:
(ProbeJ16 from the bac k of the Bottom
board.)
J16-14= +5 VDC in PIX m ode
Isthe
SEL_EXVIDEO
signalOK?
Replacethe Dis play
module.
Usethis proc edure when
thereis no display in the
Picturedisplay m ode.
Goto Figure 6--20.
Removethe D isplay module. (For instruments with serial numbers
belowBO20100, remove t he Display module and Backlight board.)
Powerup the instrum ent. Connect a 100% flat field test signal to
theVIDEO IN PUT.Select the Pic ture display mode.
No
Yes
No
Yes
No
Yes
Figure6 -25: Flowchart for no picture display