Tektronix WVR8200, Service Manual

Page: 55 / 78

General Maintenance
c. Probe pins 31 and 32 of connector J26 during the boot sequence. If the
signal on either of these pins does not toggle, replace the main board. If
both signals do toggle, probe pins 31 and 32 of J200 on the audio board.
If the signal does not toggle on either pin, suspect the cable.
d. Probe pin 30 of J200 on the audio board during the boot sequence. If the
signal does not exhibit a low-to-high transition, replace the audio board.
If the signal does transition, check pin 30 of connector J26 on the main
board. If the signal on pin 30 does not toggle, suspect the cable; if the
signal on pin 30 does toggle, suspect the audio board.
e. If all signals in a through d are correct replace the audio board.
3. If the Diagnostic Log screen reports the failure Audio DSP Self Test-dsp0 ,
perform the following procedure:
a. Check to see if the audio board is recognized by the main board by
pressing the
Main button, then CONFIG and selecting Utilities > View
HW/SW Version .
b. If there is an audio option listed, suspect the audio board; otherwise,
proceed to step c.
c. Probe pins 3 through 14 on the main board connector J26, and verify
that the signals on all pins are toggling. If any signals are not toggling,
replace the main board. If they all are toggling, check them again on the
audio board J200. If any of the signals do not toggle on the audio board,
replace the cable.
d. Probe pins 15 and 18 on connector J26 during boot-up and verify that the
signals toggle. If they are not toggling, suspect the main board. If they are
toggling, check them again on the audio board J200. If either of the signals
on pins 15 and 18 do not toggle on the audio board, replace the cable.
e. Probe pin 25 on the audio board connector J200 during the boot sequence.
If the signal does not toggle, replace the audio board; otherwise, check
it again on the main board at connector J26. If the signal on pin 25 does
not toggle on the main board, then replace the cable; otherwise, replace
the main board.
f. If all of these steps pass, replace the audio board.
WVR8200 and WVR8300 Waveform Rasterizers Service Manual 4–15