Troubleshooting Procedures
6–48 WFM 90 and WFM 91 Service Manual
Use this procedure when the menus
are horizontally unlocked (tearing) in
the Picture display mode.
Yes
No
Check the horizontal and vertical sync
signals on the Bottom board:
(J9 is on Top board.)
J9-18 = VSYNC is a TTL Level (locked to
Video IN V-sync)
J9-19 = HSYNC is a TTL Level (locked to
VIDEO IN H-sync)
Does the
input signal have
noisy sync?
Are the
VSYNC and HSYNC
signals good and locked
to the video
input signal?
Replace the Top board.
No
Correct the problem on the input signal.
Replace the Bottom board.
Yes
Figure 6–29: Flowchart for bad menus in the picture display