2
Measure the power supply voltages at L1, L2, and L3 on the system
board.
The test points are not marked on the system board; see figure below for
location of test points.
Make sure that the voltage measurements are within the following tolerances.
Table 4-13
Power Supply Voltage Tolerances
+5.1 V ±150 mV (+4.95 V to +5.25 V)
+15.75 V ±787 mV (+14.96 V to +16.54 V)
− 15.75 V ±787 mV (−14.96 V to −16.54 V)
Low Voltage Power Supply voltage test points
(bottom side of oscilloscope
Figure 4–1
Service
Adjusting the Oscilloscope
4–29
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