Lincoln Electric SVM101-B service manual Table F.5, Points Steps, Probe Acceptable Meter Reading

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F-34 TROUBLESHOOTING & REPAIR F-34

INPUT RECTIFIER TEST

FIGURE F.11 - INPUT RECTIFIER LOCATION

TEST PROCEDURE

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1.Perform Input Filter Capacitor Discharge Procedure as detailed in this section.

2.Locate Input Rectifier (Component D-13).

3.Locate leads needed to perform tests shown in Figure F.11.

4.Use ohmmeter to perform tests shown in Table F.5. Replace the Inpit Rectiferif readings are not as indi- cated

NOTE: When installing a new Input Rectifier, torque mounting nuts (in a cross tightening pattern) to 6 inch-pounds (.7 Nm). Torque terminals to 26 inch- pounds (3 Nm). ALWAYS GO TO STEP 6 TO CHECK RELATED COMPONENTS.

6.Inspect Main Power Switch S1 and replace if faulty. Go to step 7.

7.Test Capacitors C1 and C2 and replace both Capacitors if either is faulty.

NOTE: Faulty Capacitors could be the reason for a defective Input Rectifier.

Visually inspect Capacitors for leakage, damage, etc., and use appropriate test equipment to determine com- ponent integrity (also check/test Switch Boards for damage).

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TABLE F.5

	Test	Points
Steps	+ Probe	– Probe	Acceptable Meter Reading
A	9	H1	Greater than 1K ohms
B	9	A	Greater than 1K ohms
C	9	H5	Greater than 1K ohms
D	H1	9	Less than 100 ohms
E	A	9	Less than 100 ohms
F	H5	9	Less than 100 ohms
G	12	H1	Less than 100 ohms
H	12	A	Less than 100 ohms
I	12	H5	Less than 100 ohms
J	H1	12	Greater than 1K ohms
K	A	12	Greater than 1K ohms
L	H5	12	Greater than 1K ohms

V300-I