Tektronix WVR4000, Руководство по обслуживанию

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Maintenance
1. Check the VBULK test point and verify that it is approximately the same as
the input voltage. Input voltage is about 12 V with the supplied AC converter.
2. Check the following test points for the individual supplies. (See Table 5.)
Table 5: Backplane board secondary supplies
Nominal (V) Allowed range (V) Measure at
VBULK
Input V (anywhere in 10 V to
18 V range) with up to 0.2 V
drop
TP20
Fan 5 to 13.5 TP11 1
+5 4.75 to 5.25 TP3 1
3.3 3.2 to 3.4 TP4 2
2.5 2.4 to 2.6 TP5 2
1.5 1.4 to 1.6 TP6 2
-5 -4.75 to -5.25 TP7 2
1
Near the fan circuits.
2
Near the central mounting hole in the middle of the Backplane board. You may have to gently press the J3 and J8
ribbon cables out of the way to access it.
Check the Audio supplies on the Audio board (if an Audio board is installed).
The test points are available, with the board installed, at the location speci
fi ed.
(See Figure 2.)
WVR4000 and WVR5000 Service Manual 17