Adjustments
CSA 803C Service Manual 5Ć9
Setup to Examine/Adjust Voltage Reference
CSA 803C
A2A2Control
RectifierBoard
(seeFigure 5Ć2) ToTP221
ToTP701
DigitalVoltmeter
Hi
Low
This procedure should only be performed if maintenance is required.
This is not necessary for verifying instrument specifications.
Procedure to Examine/Adjust Voltage Reference
ăStep 1:ăPerformthe following settings in the order listed:
a. Set the front panel ON/STANDBYswitch to STANDBY and the rear
panel PRINCIPALPOWER SWITCH to OFF. Disconnect the CSA
803C from the power source.
b. Removethe Power Supply module following the procedure listed
under PowerSupply Module Removal/Replacement in the MainteĆ
nanceSection.
c. Create a short between test points TP830 and TP831 on the A2A2
Control Rectifier board using a shorting strap. See Figure 5Ć2.
d. Connectthe CSA 803C Power Supply module to a suitable line powĆ
ersource.
e. Set the rear panel PRINCIPALPOWER SWITCH to ON.
ăStep 2:ăWith the Digital Voltmeterset to DC Voltage and connected as
indicated in the setup diagram, check that the multimeter reads within
the limits of +5.15 V and +5.25 V.
DO NOT attempt to change the following adjustment setting if the
reading is within the stated limits. Instead, proceed to Step 4.
WARNING
Toprevent electric shock, use extreme caution when making the
following adjustment.