GPS7 module troubleshooting
Table 10-3: GPS7 module troubleshooting (cont.)
Problem Actions
• Unstable genlock or unable to
genlock
• Run Internal Mode Oven test. (See page 10-19, Internal mode oven test.)
• Check GPS7 reference select is set to correct mode. See the TG8000 User manual for
directions.
• Verify reference signal is valid and is the correct format. Use a WFM7120 or WFM8300
waveform monitor.
• Check ADC Bus diagnostics. (See page 10-20, ADC bus diagnostics.)
• Run Loop Out Reference test. (See page 10-21, Loop output reference test.)
• Swap m odules/mainframes.
• If no other problem found, replace the GPS7 module.
• Unable to detect or use timecode
• Verify timecode is present on the input signal. Use a WFM7120 or WFM8300 waveform
monitor.
• Verify GPS7 time source select is set to VITC. See the TG8000 User manual for directions.
• Verify GPS7 time sync method is set as needed. The “Follow” mode is best for troubleshooting
purposes. See the TG8000 User manual for directions.
• Check the GPS7 status menu for the Genlock input amplitude and VITC present indicators.
See the TG8000 User manual for directions.
• Run Loop Out Reference test. (See page 10-21, Loop output reference test.)
• Swap m odules/mainframes.
• If no other problem found, replace the GPS7 module.
10–10 TG8000 Multiformat Test Signal Generator Service Manual
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