Tektronix WFM6100 Opt. MB, Руководство по обслуживанию

Страница: 47 / 76

General Maintenance
WFM6100, WFM7000, and WFM7100 With Option FP Service Manual
4- 17
1. Prepare a test oscilloscope with the following settings:
H
Horizontal Scale 5.00
μ
s/div
H
Vertical Scale 2.00 V/div
2. If the diagnostic log contains an entry that reads Fail Audio DSP Self Test
fpga
, do the following substeps:
a. Check Audio board DS511, the FPGA programmed indicator (see
Figure 4--2 on page 4--23). If this LED is off, skip to step b; otherwise
probe pin D21 of connector J641 of the Audio board (the connector to
the Main board) during the boot sequence. If the signal on the pin
toggles, replace the Main board; otherwise, replace the Audio board.
b. Probe pin D20 of J641 on the Audio board during the boot sequence. If
the signal does not exhibit a low-to-high transition, replace the Main
board.
c. Probe pins A11 and B11 of connector J641 during the boot sequence. If
the signal on either of these pins does not toggle, replace the Main
board.
d. Probe pin D19 of J641 on the audio board during the boot sequence. If
the signal does not exhibit a low--to--high transition replace 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
CONFIG button, and then select 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 E15 through E22 and pins D16,17,18, and C17 on the Audio
board connector J641, and verify that the signals on all pins are toggling.
If any signals are not toggling, replace the Main board.
d. Probe pins C15, C16 and C18 on connector J641 during boot up and
verify that the signals toggle. If they are not toggling, suspect the Main
board.
e. Probe pin B21 on the audio board connector J641 during the boot
sequence. If the signal does not toggle, replace the Audio board;
otherwise, replace the Main board.
f.
If all of these steps pass, replace the Audio board.