Tektronix WVR6020 Service Manual

General Maintenance
1. If there are any
failures, prepare a test oscilloscope with the following settings:
a. Vertical Scale 2.00 V/div
b. Horizontal Scale 200 ns/div
2. If there is Lissajous Frequency failure, perform the following substeps:
a. Put the oscilloscope probe on pin 62 of connector J200 on the audio
board. Verify the signal is ~3 V
p-p
and is a continuous 50% duty-cycle
squarewave.
b. If the signal at J940 is not as just described in the previous step, the audio
board most likely has a failure; otherwise, proceed to next step.
c. With the oscilloscope probe, v erify the signal at J750 pin 62 of the main
board is as described in step a. If it not as described, suspect the cable; if
it is as described, replace the main board.
3. IfthereisaLissajousBusV2failure,perform the following substeps:
a. Put the scope probe on connector J200 pin 61 of the audio board a nd
verify the signal is ~3 V
p-p
and toggles low a t regular intervals.
b. If the signal on pin 61 looks OK, put the scope probe on pin 63. Pin 63 is
the data line and the signal will have a somewhat random lookdepending
on the audio source. Just verify that the signal is toggling and is ~3 V
p-p
.
c. If either signal looks bad at J200 the audio board most likely has a failure,
otherwise continue to next step. With the scope probe, check the signal at
pin
61 of J750 on the main board. Verify the signal is ~3 V
p-p
and toggles
low at regular intervals.
d. If
the signal on pin 61 looks OK, put the scope probe on pin 63. Pin 63 is
the data line and the signal will have a somewhat random lookdepending
on the audio source. Verify that the signal is toggling and is ~3 V
p-p
.
e. If either signal is bad, suspect the cable; otherwise replace the main board.
Option EYE/PHY
T
roubleshooting
The EYE/PHY functions depend on the Loopthrough, EYE, and Main boards,
and the interconnections between them.
NOTE. Options EYE and PHY are available only for the WVR7120 instrument.
WVR6020, WVR7020, and WVR7120 Waveform Rasterizers Service Manual 4–21

Tektronix WVR6020 Specifications

General

Brand	Tektronix
Model	WVR6020
Category	Measuring Instruments
Language	English