Calibration
6–26
1502C MTDR Service Manual
1. Pull the POWER switch to the ON position.
2. Observe that the power draw does not exceed 4 Watts on the Variac.
Power Supply Board
Figure 6–41: Power Supply Board
3. Connect the positive (+) voltmeter probe to TP1020 (+16.6 VDC – it might be
marked as 15.8 V on some older power supplies).
4. Connect the negative (–) probe to TP1010 (ground).
+
–
J1010
R1010
CR1010
L1010
R1011
R1012
C1011
R1013
C1012
C1013
Q1010
Q1011
C2010
R1015
U1010
R1014
CR1011
Q1012
U1011
VR1012
R1017
C1014
R1018
C1015
C1016
C2013
R1016
R1020
R1021
U1020
R1022
R1023
U1021
TP1020
TP1010
Figure 6–42: Power Supply Test Points TP1020 and TP1010
Voltage Checks
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