Calibration
1502C MTDR Service Manual
6–29
Q2022
R2027
C2024
CR2021
C2025
TP2030
C2031
R2032
Q2030
Q2031
CR2030
CR2031
R2030
Figure 6–46: Power Supply Test Point TP2030
8. Raise the Variac output voltage to 120 VAC. The instrument should remain shut
down.
9. Turn the 1502C POWER off.
Main Board
"
12 VDC Check and Adjust
Main Board
Figure 6–47: Location of Main Board in Instrument
Test points in this check are located on the Main Board.
1. Turn the instrument over to access the Main Board.
2. Attach the positive (+) probe from the voltmeter to the + side (facing the edge
of the board) of C9031.
3. Attach the negative (–) probe to the other side of C9035.
4. Turn the instrument POWER on and check that less than 4 Watts is drawn from
the Variac.
5. Adjust R9032 for +12.0 VDC.
+12 VDC
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