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F-76

 

F-76

 

 

TROUBLESHOOTING & REPAIR

 

 

POWER SUPPLY TEST (continued)

 

TEST PROCEDURE

5.

Turn the engine off.

 

1. Turn the engine off.

6.

Using the Case Cover Removal and

Replacement Procedure, install the control

2. Perform the Case Cover Removal and

panel and side panels on the machine.

Replacement Procedure and tilt the control

 

panel out.

 

WARNING

ELECTRIC SHOCK CAN KILL.

Do not touch electrically live parts such as output termi- nals or internal wiring.

Insulate yourself from the work and ground.

Always wear dry insulating gloves.

3.Start the machine.

4.Using a voltmeter, measure the following sup- ply voltages at the designated points. See Table F.4.

Table F.4

SUPPLY VOLTAGE

MEASURED AT:

FUNCTION AFFECTED

CHECK/REPLACE

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+12VDC control

J2 pin 3 to 2 @ control bd

+12VDC control

J1 pin 4 to 1 @ control bd

+12VDC control

J5 pin 4 to 1 @ engine prot. bd

30VAC control

J12 pin 1 to 2

@ LT chopper bd

30VAC control

J13 pin 1 to 2

@ RT chopper bd

42VAC control

J3 pin 1 to 9

@ control bd

+12VDC control

J9 pin 4 to 5

@ display bd

+12VDC Battery

J9 pin 1 to 2

@ display bd

 

(run/stop on)

 

Weld output/display output

Idler control

Idler control

Weld output

Weld output

Weld output

Display output (if so equipped)

Display output (if so equipped)

Control board

Control board

leads 108, 109/cont. bd

leads 15, 16

leads 13, 14

leads 17, 18

leads 106, 107/cont. bd

leads 232, 232J, 5L, 5N, 5M/Battery

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Note: When checking leads for continuity or poor connection, remember to look closely for broken molex pins.

COMMANDER 300

Page 132
Image 132
Lincoln Electric SVM145-B service manual Power Supply Test