General Maintenance
Table 4-6: Digi
tal secondary supplies
Nominal (+V) Allowed range (+V) Measure at
1.5 1.4 to 1.6 TP430
1.8 1.7 to 1.9 TP20
2.5 2.4 to 2.6 TP432
2.6 2.6 to 2.8 TP19
3.3 3.3 to 3.55 TP530
5.0 4.75 to 5.25 TP531
After you have checked the Digital Secondary Supplies, check the Analog
supplies as shown in the following table. These have LEDs and test points . If any
voltages are out of tolerance, replace the main board. (See Figure 4-1.)
Table 4-7
: Analog supplies
Nominal (V) Allowed range (V) Measure at
–5
–5.2 to –
4.8
TP171
+5 "good" +4.75 to 5.25 TP383
Check the Audio supplies on the Audio board as shown in the following table,
(if an A
udio board is installed). The test points are available, with the board
installed, at the location specified. Check fuse F870 if there a re no audio supply
voltages. (See Figure 4-3 on page 4-25.)
Table 4-8: Audio secondary supplies
Supply name Range
+1.26 V 1.20 to 1.32
+1.5 V 1.425 to 1.575
+1.8 V 1.71 to 1.89
+3.3 V 3.1 to 3.6
+5 VA 4.8 to 5.2
+5 V 4.8 to 5.2
–5 V –4.5 to –5.5
+15 V 14 to 15.5
–15 V –14 to –15.5
WVR6020, WVR7020, and WVR7120 Waveform Rasterizers Service Manual 4–15
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