5-6 Chapter 5
Power Supply Troubleshooting
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Measure the Post Regulator Voltages
Measure the DC voltages on the test points of A8 with a voltmeter. Refer to Figure 5-3 for
test point locations and Table 5-3 for supply voltages and limits.
Figure 5-3 A8 Post Regulator Test Point Locations
Table 5-1 A8 Post Regulator Test Point Voltages
TP Supply Range
1 +65 V (not used) +64.6 to +65.4
2AGND n/a
3 +5 VD +4.9 to +5.3
4SDIS n/a
5 −15 V −14.4 to −15.6
6 −12.6 VPP (probe power) −12.1 to −12.91
7 +15 V +14.5 to +15.5
8 +5 VU +5.05 to +5.35
9 −5.2 V −5.0 to −5.4
10 +22 V +21.3 to +22.7
11 +6 V +5.8 to +6.2
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