PC Board Troubleshooting Procedure

E-7	TROUBLESHOOTING	E-7

Before replacing a PC Board which is suspected of being defective, visually inspect the PC Board in question for any electrical or mechanical damage to any of the components or conductors on the board, partially insulated molex pins or connectors.

a.If there is no visible damage to the PC Board, install a new one and see if this remedies the problem. If the problem is remedied, reinstall the old PC Board to see if the prob- lem still exists. If the problem no longer exists with old PC Board:

1.Check the PC Board harness connector pins for corrosion, contamination or looseness.

2.Check leads in the plug harness for loose or intermittent connections.

b.If PC Board has visible electrical damage, before possibly subjecting the new PC Board to the same cause of failure, check for possible shorts, opens or grounds caused by:

1.Frayed or pinched lead insulation.

2.Poor lead termination, such as a poor contact or a short to adjacent connection or surface.

3.Shorted or open control cable leads, or other external leads.

4.Foreign matter or interference behind the PC Boards.

c.If PC Board has visible mechanical damage, inspect for cause, then remedy before installing a replacement PC Board.

If there is damage to the PC Board or if replacing PC Board corrects problem, return it to the local Lincoln Electric Field Service Shop.

INPUT - BYPASS PC BOARD (EUROPEAN

MODELS ONLY)

This board is mounted to the case front and connects to the input power at the line switch. It passes excess high frequency to ground, protecting the machine and power line. For proper operation it must be securely grounded, by means of its ground and mounting screws to the case front. The quick connect terminals from the line switch must be fully seated. Failures of this board should be very rare.

BYPASS / STABILIZER PC BOARD

The board is mounted between the output terminals. It passes excess high frequency to ground before it can reach the inside of the machine. For proper operation, it must be securely grounded, by means of its ground and mounting screws, to the case front. Failures of this board should be very rare.

DISPLAY PC BOARD

The board is mounted directly to the front panel. The Control P.C. Board supplies power and metering infor- mation to the board.

CONTROL PC BOARD

This board, located on the left divider assembly, is the heart of the machine. All welding output is controlled by this board. The Display board receives its informa- tion from the Control board as well. Very little external diagnostic work can be performed on this board. If one control or function of the machine does not appear to be working, it is best to trace out the wiring associated with that function all the way back to the Control board with an ohmmeter. If all checks out there, verify that the following voltages are present at the output of the auxiliary leads at the main transformer, T1.

CONTROL PC BOARD

AUXILIARY LEAD VOLTAGES

Main Transformer (T1)	Plug P8	Approximate
Auxiliary Lead Number	Locations	Voltage

209 to 210	1 to 9	18 VAC
201 to 204	4 to 6	18 VAC
231 to 232A	2 to 12	115 VAC
211A to 212	13 to 14	23 VAC

Often, replacement with a known good board is the best service method. Remove the board that is sus- pected to be defective. Carefully look over the board, checking for burnt traces or components. If none are found, install the known good board. If the trouble goes away, reinstall the suspected bad board to confirm that the board was indeed at fault. If the problem is now gone with the original board installed, the problem is probably with one of the leads or connectors going to the board.

Consult the Lincoln Service Department if further trou- bleshooting assistance is required.

CAUTION

If for any reason you do not understand the test procedures or are unable to perform the tests/repairs safely, contact your Local Lincoln Authorized Field Service Facility for technical troubleshooting assistance before you proceed.

SQUARE WAVE TIG 275

IM609-B specifications

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