Tektronix WFM6120 Service Manual

General Maintenance
2. If the d iagnost
ic log contains an entry that reads Fail Audio DSP Self Test
fpga, do the following substeps:
a. Check audio bo
ard DS511, the FPGA programmed indicator in the Main
board power supply test points and LEDs. (See Figure 4-1 on page 4-24.).
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 b oard.
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 Main button, then CONFIG and selecting Utilities > View
HW/SW Version.
b. If there is an audio option listed, suspect the audio board; otherwise,
proceedtostepc.
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 s ignals are not toggling, replace the main board.
d. Probe pins C15, C16, and C18 on connector J641 during boot up and
v
erify that the signals toggle. If they are not toggling, suspect the main
board.
e. Probe pin B21 on 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.
4–18 WFM6120, WFM7020, and WFM7120 Waveform Monitors Service Manual

Tektronix WFM6120 Specifications

General

Brand	Tektronix
Model	WFM6120
Category	Monitor
Language	English