Tektronix TG8000 Service Manual

GPS7 module troubleshooting
Problem ident
ification
Ifthereisaproblem,first perform the GPS7 Performance Verification procedure,
found in the TG8000 Specifications and Performance Verification manual,
available on
the Web at www.tektronix.com/manuals. Any problems found with
that procedure can be a starting point for troubleshooting.
General problems and actions to follow are shown in the following table. (See
Table 10-3.)
Table 10-3: GPS7 module troubleshooting
Problem Actions
• Fails Power On Self Test (POST)
• GPS7 does not appear in menu
• Verify the GPS7 module is installed in slot 1 of the mainframe.
• Run power on test procedure. (See page 10-11, Power on self test.)
• Check for current software. (See page 10-11, Check the installed firmware version.)
• Run power supply test. (See page 10-14, Power supply test.)
• Swap the module with a known good GPS7 module and try again.
• GPS7 does not lock
• GPS7 does not acquire satellite
• Run power on test procedure. (See page 10-11, Power on self test.)
• Check DC antenna power voltage. (See page 10-18, DC antenna output power voltage.)
• Check GPS antenna signal source. (See page 10-12, Check the GPS antenna signal source.)
• Check diagnostics reported values. (See page 10-13, Check diagnostic reported values.)
• Swap the module with a known good GPS7 module and try again.
• Unstable G PS lock (determined
by Performance Verification or
through normal use)
• Verify 20 minute warm-up, then recheck stability relativ e to reference unit.
• Check GPS antenna signal source. (See page 10-12, Check the GPS antenna signal source.)
• Verify configuration. (See page 10-12, Verify the configuration.)
• Check diagnostics reported values. (See page 10-13, Check diagnostic reported values.)
• Run Internal Mode Oven test. (See page 10-19, Internal mode oven test.)
• If both units have not acquired positi on, run Acquire New Position procedure.
• Frame phase wrong (determined
by Performance Verification
•TimeofDaywrong
• Verify configuration. (See page 10-12, Verify the configuration.)
• Check time zone offset configuration and time of day source. See the TG8000 User manual
for directions.
• Check diagnostics reported values. (See page 10-13, Check diagnostic reported values.)
• Run Acquire New Position procedure. (See page 10-17, Acquire new position.)
• No Black Burst outputs
• No LTC outputs
• Run power supply test.
• Verify configuration. (See page 10-12, Verify the configuration.)
• Check diagnostics reported values. (See page 10-13, Check diagnostic reported values.)
• S wap modules/mainframes.
• If no other problem found, replace the GPS7 module.
• Long GPS lock time • Check GPS antenna signal source. (See page 10-12, Check the GPS antenna signal source.)
• Adjust oven oscillator. (See page 10-17, Oven oscillator frequency adjustment.)
• Verify configuration. (See page 10-12, Verify the configuration.)
• Check diagnostics reported values. (See page 10-13, Check diagnostic reported values.)
• If no other problem found, replace the GPS7 module.
TG8000 Multiformat Test Signal Generator Service Manual 10–9

Tektronix TG8000 Specifications

General

Brand	Tektronix
Model	TG8000
Category	Portable Generator
Language	English