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F-177

F-177

TROUBLESHOOTING & REPAIR

PRINTED CIRCUIT BOARD REMOVAL AND REPLACEMENT

(CONTROL BOARD, POWER BOARD, AND PROTECTION BOARD) (continued)

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CAUTION

Be sure to follow the recommended static-free methods for handling printed circuit boards. Failure to do so can result in permanent dam- age to the equipment.

8.Remove the molex plugs from the PC board you are removing.

NOTE: The plugs are numbered in order from left to right.

9.Depress the two PC board retainer clips located on the left and right sides of the board. Lift the board by the clips to remove it.

10.When reinstalling the PC board, make cer- tain the tabs at the bottom of the board fit into the slots on the compartment floor. When the board is properly seated, the retainer clips will snap into the locked position.

11.Install the molex plugs removed earlier. Be sure to fit the each plug into its respec- tive receptacle on the board.

12.Perform appropriate calibration procedure per flowchart in Figure F.67.

13.Install the PC board cover and tighten the two screws with the 5/16" nut driver.

14.Install the machine case sides and top.

15.Install the handle and the lift bail rubber gasket.

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FIGURE F.67 – PC BOARD REPLACEMENT CALIBRATION REQUIREMENTS

DISPLAY

 

SNUBBER

 

SHUNT

 

CONTROL

 

 

AMPLIFIER

 

BOARD

 

BOARD

 

 

BOARD

 

 

BOARD

 

REPLACED

 

REPLACED

 

 

REPLACED

 

 

REPLACED

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

IF POSSIBLE

 

 

 

 

QUICK

 

 

 

 

VOLTAGE

 

 

 

CURRENT

CALIBRATION

 

 

 

 

 

 

CALIBRATION

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

FULL

VOLTAGE

CALIBRATION

POWER WAVE 450

Page 237
Image 237
Lincoln Electric SVM112-B service manual Figure F.67 PC Board Replacement Calibration Requirements