Tektronix WVR8200, Service Manual

Page: 53 / 78

General Maintenance
Check the Audio supplies on the Audio board (if an Audio board is installed).
(See Table 4-6 on page 4-13.). The test points are available, with the board
installed. (See Figure 4-3 on page 4-21.).
Table 4-6: Audio board secondary supplies
Supply name Range
+1.26 V 1.20 to 1.32
+1.5 V 1.425 to 1.575
+1.8 V 1.71 to 1.89
+3.3 V 3.1 to 3.6
+5 VA 4.8 to 5.2
+5 V 4.75 to 5.2
-5 V -4.5 to -5.5
+15 V 14 to 15.5
-15 V -14 to -15.5
The Eye board also has multiple secondary supplies. The Power-up Diagnostics
measure these, so they are not included in this procedure. Note that some of these
supplies are only active in either SD or HD mode, so it is normal for some of them
to not be present in some operating modes.
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, the 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 J7. If the cable is connected and good then replace the front panel
assembly.
Display Troubleshooting
Perform this test if there is no display on the external monitor, but the power
supplies test as nominal.
1. Connect an external XGA monitor to the DVI Primary output on the rear
of the instrument.
2. Cycle the power and watch the external monitor. If the monitor does not
display the boot up messages and normal operational screen, replace the
main board.
WVR8200 and WVR8300 Waveform Rasterizers Service Manual 4–13