Lincoln Electric SVM188-A service manual Firing Board Test

Page 58

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F-18

TROUBLESHOOTING AND REPAIR

 

F-18

 

FIRING BOARD TEST (continued)

 

 

 

FIGURE F.6 FIRING BOARD

 

 

 

 

 

(205) 8

J5

 

LED8

LED9 LED7

16 (204)

 

 

 

(206) 7

15 (203)

 

 

 

(207) 6

14

 

 

 

(208) 5

13 (231)

 

 

 

4

12 (215)

 

 

 

3

11

 

 

 

2

10

 

 

 

1

 

 

 

9

 

 

 

 

LED5

LED3

LED1

 

J6

 

 

 

 

LED10

J7

LED6 LED4 LED2

J8

J4

G3742-[ ]

FIRING BOARD

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PROCEDURE

WARNING

ELECTRIC SHOCK can kill.

• Do not touch electrically hot parts.

7.Trigger the DC-600 using the Output Terninal Switch and see that LEDs 1 thru 6 and LED 10 come on.

NOTE: LEDs 1 thru 6 should alwaysl be the same bril- liance as each other. The brilliance will vary as the Output Control is changed.

8.If LED 10 does not come ON, perform the Internal

Trigger Test.

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9. If LEDs 7,8 &9 are ON and any of LEDs 1 thru 6

1.

 

Disconnect the AC input power to the DC-600

 

are not ON, turn the machine OFF , disconnect J4

 

 

machine.

and re- energize the machine. All six LEDs should

2.

 

Locate the firing board on the left side of the con-

be ON very bright. If not Replace the Firing Board.

 

If so perform the SCR Bridge Test.

 

 

trol box.

 

 

 

3.

 

Perform a visual inspection on the firing board to

10. If LEDs 7,8 &9 are ON and any of LEDs 1 thru 6

 

are not the same briliance as the others, Perform

 

 

see if there are any loose or faulty connections or

 

 

the SCR Bribge Test. If OK, replace the Firing

 

 

physical damage.

 

 

Board.

4.

 

Connect the correct AC input power to the DC-600.

 

11. If LEDs 1 thru 6 do not change as the output con-

5.

 

Turn the power switch (SW1) to the ON position.

 

trol is varied:

6.

 

LEDs 7, 8 and 9 should be lit and equally bright.

• Check the Output Control Potentiometer.

 

 

See Figure F.4 to locate the LEDs. The three LEDs

 

should be of equal intensity. If not correvt, see the

• Make sure that the Local/Remote Switch is in

Local and functioning properly.

PC Board Troubleshooting Guide.

 

 

• Perform the Control Board Test. If OK, replace

 

the Firing Board

DC-600

 

Page 57 Page 59
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Page 57 Page 59
Contents DC-600 ISAFETYi Fumes and Gases SafetyElectric Shock can kill Can be dangerousPowered equipment For ElectricallyPrécautions DE Sûreté Sûreté Pour Soudage a L’ArcElectromagnetic Compatibility EMC Safety Master Table of Contents for ALL Sections Table of Contents Installation Section Installation Technical Specifications DC-600Electric Shock can Kill Safety PrecautionsSelect Proper Location Electrical Input Connections Fuse and Wire SizesGround Connection Reconnect Procedure Connection for Highest Rating Plate VOLTAGE, 50 or 60 HZConnection for 440 Volts 50 or 60 HZ V 60HZ See Machine Rating Plate for Required Input Supply Voltage ELECTRODE, Work and #21 Lead Output ConnectionsConnections Terminal Strip 1 T.S.1 Auxiliary Power Control ConnectionsTerminal Strip 2 T.S.2 DC-600 Table of Contents Operation Section Safety Precautions OperationGeneral Description Design Features AdvantagesRecommended Processes and Equipment Welding Capability Meanings of Graphical Symbols on Case FrontOFF Input Power Output Control Output Voltage CurrentMeaning of Graphical Symbol for Ground CON- Nection Controls and SettingsAuxiliary Power in MS-RECEPTACLE OVERLOAD, OVERCURRENT, and Fault ProtectionWelding Procedure Recommendations Remote Control of Machine OperationOperating Steps NA-3 Automatic Wire Feeder RemoteLN-8 or LN-9 SEMI-AUTOMATIC Wire Feeder LN-7 and Other Constant Wire FeedersDC-600 Table of Contents Accessories Section Factory or Field Installed Options AccessoriesWire Feeders and Tractors Field Installed OptionsFigure C.2 MULTI-PROCESS Switch Cable Connections Accessories Table of Contents Maintenance Section Safety Precautions Electric Shock can Kill MaintenanceRoutine and Periodic Maintenance 1TABLE of CONTENTS-THEORY of Operation Section E-1 Theory of Operation Input Circuit and Main TRANS- FormerRectification Firing CIRCUIT, Control CIR- Cuit and RectificationFiring Board Thermal Protection SCR Operation DC-600 1TABLE of Contents Troubleshooting and Repair F-1 2TROUBLESHOOTING and REPAIRF-2 HOW to USE Troubleshooting GuideTroubleshooting and Repair PC Board Troubleshooting ProceduresControl Feeder. See Protective Devices Check all three phase input Output Control J1,Pin2. See Wiring Diagram Wiring Diagram Test Description PC Board Troubleshooting GuideMaterials Needed PC Board Troubleshooting Guide Control Board Figure F.2 Control Board LEDsDC-600 Internal Trigger Circuit Test Procedure Internal Trigger Circuit TestInternal Trigger Circuit Test 75 76DC-600 Firing Board Test Firing Board Test Control Board Test Control Board Test Figure F.7 Control BoardMain Transformer Voltage Test Main Transformer Voltage Test Figure F.8 Input Contactor and Reconnect PanelFigure F.9 Transformer Secondaries Main Transformer Voltage Test Control Transformer Test Procedure Control Transformer TestInput Contactor Test Input Contactor Test Voltage TestSCR Bridge Test Anode Cathode Remove Insulating Paint SCR Bridge TestActive Test Scope Settings Maximum Output Setting no Load Minimum Output Setting no Load 35TROUBLESHOOTING and REPAIRF-35 2V/Div Volts DC-600 Input Contactor CR1 CLEANING/REPLACEMENT Cleaning Procedure Input Contactor CLEANING/REPLACEMENT ProcedureContactor Replacement Procedure SCR Rectifier Bridge Removal and Replacement Procedure Removal Procedure 42TROUBLESHOOTING and REPAIRF-42Removal and Replacement Procedure SCR Rectifier BridgeReplacement Procedure Insulator Lock Washer Plain Washer Output Snubber LeadDC-600 Main Transformer and Choke Removal and Replacement Removal and Replacement Main Transformer and ChokeRemoval Procedure Weld Input Idle Amps and Watts Maximum Open Circuit VoltagesDC-600 Table of Contents Diagram Section Electrical Diagrams Wiring Diagram 230/460/575 Volt Machines G3506-1 Schematic Complete Machine G3575 Schematic Control PC Board G3408-1 Control PC Board Assembly G3409-1 Schematic Firing PC Board G3741-1
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