GPS7 module troubleshooting
4. Configure the Re
ference Source of the GPS7 module to be NTSC Burst.
a. Press the MODULE button until GPS7 appears.
b. Use the up (▲)ordown(▼) arrow button to select REFERENCE.
c. Press the ENTER button.
d. Press the right (►) arrow button until NTSC Burst appears, and then
press the ENTER button.
e. Press the BACK button.
5. Configure Black 2 of the GPS7 module to Enable Loop Output from Black 1.
a. Use the up
(▲)ordown(▼) arrow button to select SELECT OUTPUT.
b. Press the right (►) arrow button until BLACK 2 appears, and then press
the ENTE
R button.
c. Use the up (▲)ordown(▼) arrow button to select LOOP FROM
BLACK1
.
d. Press the right (►) arrow button until Enable appears, and then press
the EN
TER button.
e. Press the BACK button.
6. Use the WFM7120 to examine the video. Check that the signal level is
appropriate. The normal level is approximately twice the normal video
size
. Check for clipping or distortion of the signal. If the signal level is not
appropriate or there is clipping or distortion, replace the GPS7 module.
10–22 TG8000 Multiformat Test Signal Generator Service Manual
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