Tektronix CSA 803C Power Supply

Adjustments
CSA 803C Service Manual 5Ć7
This procedure shows the setup and lists the steps to examine the MeaĆ
sured VoltageSupply and to check and adjust the Voltage Reference and
the Regulator Reference (see Figures 5Ć1, 5Ć2, and 5Ć3).
This procedure should only be performed if the instrument is out of
measurement limits and maintenance is required. If the CSA 803C is
already within limits, proceed to the Display adjustment procedure.
Measurement Limits
The measurement limits for this procedure are as follows:
Measured VoltageSupply limits must be within +4.85 V and +5.25 V
VoltageReference must be within +5.15 V and +5.25 V
Regulator Reference must be within +9.95 V and +10.05 V
Setup to Examine Voltage Supply
CSA 803C
TP200(VCC) and
TP300(GND) on A18
MemoryBoard
(seeFigure 5Ć1) ToGround
To+5 V
DigitalVoltmeter
Hi
Low
Procedure to Examine Voltage Supply
ăStep 1:ăSet the CSA 803C ON/STANDBYswitch to ON, and initialize as
follows:
UTILITYbutton press...........................................
Initialize (in major menu) touch..............................
Initialize (in verification popĆup menu) touch..................
ăStep 2:ăWith the CSA 803C top and bottom covers removed, refer to
Section 3 andlocate the A18 Memory circuit board.
ăStep 3:ăConnectthe digital multimeter to TP200 and TP300 as indicated
in the setup illustration (see also Figure 5Ć1).
Power Supply