Zenith Z-171 Series Service Manual page 86

Page
6-12
System Checkout and Troubleshooting
Figure 6-4: Video Board
STEP
PROCEDURE
YES
NO
5j
Using an oscilloscope, view the output of
the composite video connector. Refer to
the RGB video board section in Chapter
5 for the waveform and adjustment proce-
dures. Does the output approximate the
waveform shown?
51 5k
5k
Replace the video board. Does anything
appear on the screen?
5 51
51
Return the monitor to the shop for ser-
vice. When the monitor is repaired or a
functional monitor is obtained, proceed to
step 5.