Lincoln Electric IM692 manual PC Board Troubleshooting Guide Firing P.C. Board

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TROUBLESHOOTING

 

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Observe all Safety Guidelines detailed throughout this manual

 

 

 

 

 

 

 

 

 

PC BOARD TROUBLESHOOTING GUIDE - FIRING P.C. BOARD

1.LEDs 1 through 9 must be lit when the Multi-Source is turned on and the Control board is sending an enable signal to the Firing board (pin 7 in P8 is low in reference to common at pin 12 in P5).

2.LEDs 7, 8, and 9 indicate AC power being supplied to the P.C. board from auxiliary windings on the main transformer (T1). If a LED is not on, turn the machine off and unplug P8 from the firing board. Turn the machine back on and check the following voltages:

3.If all voltages are present, turn power off, and plug P5 back into J5. Turn power back on. If LEDs 7, 8 or 9 are still not lit, replace Firing PCB.

4.If voltages were not present, check the circuit back through the external dropping resistors to the auxil- iary windings for a possible open resistor or wire.

5.LEDs 1 through 6 indicate gate signals are being sent to the main SCRs 1 through 6 respectively. If LED2 on the Control board is bright, along with LEDs 7, 8, and 9 on Firing board, and LEDs 1 through 6 are unequal in brightness, check to make sure lead 231 between Control board and Firing board is not broken. (If lead 231 is removed while the machine output is at open circuit, the output voltage peaks may be unregulated and cause the over-voltage protection circuit to open the input contactor. The over-voltage protection circuit may disabled by disconnecting lead 222D at the nega- tive output stud or at pin 1 of P2. NOTE: The machine may not be used for welding with the pro- tection circuit disabled.

6.If one or more of LEDs 1 through 6 are off, LEDs 7, 8, and 9 are on and the voltage on lead 231 from the Control board (pin 13, P5 to pin 12, P5) is 3 to 13Vdc replace the Firing PCB.

LED that was off

Check AC voltage between

Voltage should be approximately

7

P8 pins 2 & 1 (wires 283,284)

32Vac

8

P8 pins 4 & 3 (wires 285,286)

32Vac

9

P8 pins 6 & 5 (wires 287,288)

32Vac

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.

MULTI-SOURCE

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Contents MULTI-SOURCE California Proposition 65 Warnings SafetyElectric Shock can kill Cylinder may explode if damaged Sûreté Pour Soudage a L’Arc Précautions DE SûretéThank You Table of Contents Technical Specifications Multi-Source K1752-1 InstallationInput and Grounding Connetions LocationStacking Recommended Equipment and Processes Output CABLES, Connections and LimitationsDesign Features ALL Models Safety PrecautionsOperation General DescriptionAccessories Routine Maintenance MaintenancePeriodic Maintenance Machine Calibration SpecificationHOW to USE Troubleshooting Guide TroubleshootingContact your local Lincoln Authorized Field Service Facility Troubleshooting PC Board Troubleshooting Guide Firing P.C. Board PC Board Troubleshooting Guide Control P.C. Board Diagrams MULTI-SOURCE Wiring DiagramMULTI-SOURCE Dimension Print Page Page How To Read Shop Drawings Precaucion Warnung