Calibration
1502C MTDR Service Manual
6–27
5. Verify that the supply voltage is 16.6 VDC and there is a minimal current drawn
(< 2W) from the Variac.
6. Connect the positive (+) voltmeter probe to TP2030. The negative (–) voltmeter
probe should remain connected to ground. The reading should be +16.2 VDC
(see following table for tolerances).
R2025
R2026
Q2021
Q2022
R2027
C2024
CR2021
C2025
TP2030
C2031
U2030
T1030
R2031
R2032
Q2030
Q2031
CR2030
CR2031
R2030
C2030
Figure 6–43: Power Supply Test Point TP2030
Supply Range Test Point Location
+16.2 VDC +15.9 to +16.4 VDC TP2030 Power Supply Board
+5.0 VDC +4.85 to +5.25 VDC Pin 1, J5040 Main Board
–5.0 VDC –4.85 to –5.25 VDC Pin 3, J5040 Main Board
+15.0 VDC +14.7 to +15.3 VDC Pin 4, J5040 Main Board
–15.0 VDC –14..7 to –15.3 VDC Pin 6, J5040 Main Board
7. Make a mental note of the location where the ribbon cable from the power
supply is plugged into the Main Board, then turn the instrument over.
NOTE. When the instrument is turned over, you will be looking at the top (component
side) of the Main Board.
The J5040 pins go through the circuit board and appear on the top (component side)
of the Main Board. J5040/P5040 is the input from the power supply. The other end
of the cable is J1030/P1030 on the Power Supply Board. Measure the voltages on
the pins listed in the table and verify the supply voltages.
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