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CSA 803C Service Manual
5Ć11
Setup to Examine/Adjust Regulator Reference
CSA 803C
A4
Regulator
Board
(see Figure 5Ć3)
To Com
Test Point
To Ref
Test Point
Digital Voltmeter
Hi
Low
Procedure to Examine/Adjust Regulator Reference
ăStep 1:ăMake the connections shown in the setup and Figure 5Ć3 diaĆ
grams. Check that the CSA 803C power is ON.
ăStep 2:ăWith the Digital Voltmeter in DC Voltage mode, check the VoltĆ
meter for a reading within the limits of +9.95 V and +10.05 V.
DO NOT attempt to make the following adjustment to R730 if the
reading is within the stated limits. Instead, proceed to Step 4.
WARNING
To prevent electric shock, use extreme caution when making the
following adjustment. Access the test points from the right side of
the oscilloscope.
ăStep 3:ăAdjust the +10 V Ref, R730, on the A4 Regulator board to
+10.00 V.
ăStep 4:ăRemove the test leads.
ăStep 5:ăInitiate PowerĆOn Diagnostics (see Performance Verification
section).