Tektronix WFM5250, Service Manual

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Troubleshooting
Power-Up Diagnostics To examine the Power-up Diagnostics results, press the CONFIG button, then
select Utilities > View Diagnostic Log .
Each power on is indicated by a boot time stamp, followed by a list of power on
tests. If any failures are indicted then refer to the action as previously noted.
Advanced Diagnostics To run the Advanced Diagnostics, press the CONFIG button, then select
Utilities > Run Advanced Diags .
Advanced Diagnostics includes tests that check the interfaces between FPGAs and
memory on the FPGA board. If any of these tests fails, replace the FPGA board.
Diagnostic Monitor Voltage
Checks
This test uses the built-in voltage monitor to check many power supplies on the
Video I/O, FPGA, and CPU boards. It requires successful boot up, display, and
front panel operation:
1. Press and hold OTHER, then select Diag Monitor to display the diagnostic
monitor screen.
2. Navigate to pages 2 and 3 to display the power supply voltages. If the “Last”
value of any voltage is outside the allowable range, it will be displayed in red.
Voltage values are updated about every 10 seconds.
3. If any voltage is out of range, replace the faulty module as indicated by the
fi rst word of the displayed line. “Input” indicates the power supply is on
the Video I/O board.
Front Panel Button
Troubleshooting
Perform this test if the power supplies are good, but none of the buttons are lit
or respond to presses:
1. Cycle the power to the unit. Immediately after power on, three buttons
(GAIN, SWEEP, and MAG) should be lit continuously and the other buttons
should be lit one at a time in a walking pattern.
2. If the buttons are not lit, check the 10 pin cable from the keypad to the main
board J21. If the cable is connected and good, then replace the front panel
assembly.
24 WFM5250 Waveform Monitor Service Manual