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CSA 803A Service Manual
5Ć9
Setup to Examine/Adjust Voltage Reference
CSA 803A
A2A2 Control
Rectifier Board
(see Figure 5Ć2)
To TP221
To TP701
Digital Voltmeter
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:ăPerform the following settings in the order listed:
a. Set the front panel ON/STANDBY switch to STANDBY and the rear
panel PRINCIPAL POWER SWITCH to OFF. Disconnect the CSA
803A from the power source.
b. Remove the Power Supply module following the procedure listed
under Power Supply Module Removal/Replacement in the MainteĆ
nance Section.
c. Create a short between test points TP830 and TP831 on the A2A2
Control Rectifier board using a shorting strap. See Figure 5Ć2.
d. Connect the CSA 803A Power Supply module to a suitable line powĆ
er source.
e. Set the rear panel PRINCIPAL POWER SWITCH to ON.
ăStep 2:ăWith the Digital Voltmeter set 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
To prevent electric shock, use extreme caution when making the
following adjustment.