HD3G7 module troubleshooting
Converter mode test
Follow this pro
cedure if there is a problem when the HD3G7 module is set for
converter mode:
1. Confirm that the input signal is present and that the format is compatible with
the selected output. Specifically the input must be interlace video at the same
frame rate as the progressive output (same frame rate: 50, 59.94, or 60 Hz).
2. Remove and reconnect the input signal a few times to see if that clears the
problem.
3. Verify the input is good:
a. Apply the input signal directly to the WFM7120.
b. Check for general status problems, correct format, E DH errors, and
excessive jitter.
4. If the HD3G7 status screen continues to report "Input Signal Unlocked" check
the input module "NO_INPUT_DETECT" test point, along the top edge of
the input board. If the voltage on the test point is low, an input is detected and
the fault is probably on the main module board.
Figure 11-3: No_Input_Detect test point location on the HD3G7 module
Powerupinfactorymode
Putting the instrument into factory mode allows access to calibration, but it also
allows the module to show in the menus even if it fails the POST routine.
1. Restart the instrument in Factory mode:
a. Press and hold the MODULE, ENTER,andFront Panel ENABLE
buttons simultaneously.
b. Continue holding the buttons until the message TG8000 Booting...
displays.
c. When the message TG8000 Booting... displays, release the MODULE
and ENTER buttons. Continue holding the Front Panel ENABLE
button.
d. When the message TG800
0 Start up with Factory Mode displays,
release the Front Panel ENABLE button.
2. Run the Check module diagnostics routine. (See page 11-15, Check the
module diagnostics.)
TG8000 Multiformat Test Signal Generator Service Manual 11–21
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