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F-58

TROUBLESHOOTING AND REPAIR

F-58

 

SPI CABLE RESISTANCE AND VOLTAGE TEST PROCEDURE (continued)

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TEST PROCEDURE

1.Remove the input power to the V450-PRO.

2.Using the #2 Phillips screwdriver, remove the case front panel.

5.Locate and remove plug J33 from the control board. See Figure F.15.

6.Check the resistance and continuity of the SPI cable by testing with the ohmmeter from each pin on plug J33 to the corresponding pins on plug J34. See the Wiring Diagram.

7.The resistance reading pin to corresponding pin should be zero ohms or very low resis- tance. If the resistance reading is high or “open” check the plug connections to the SPI network PC boards. If the connections are OK and the resistance is high or “open” the SPI cable may be faulty.

8.Reconnect the plug into the control board.

9.With plug J33 reinstalled in the control board, carefully apply the correct input power to V450-PRO.

10.Turn on the machine.

11.Carefully check for the presence of +15VDC from plug J33 pin -1(+) to plug J33 pin -10(-) at the display board receptacle.

12.Carefully check for the presence of +5VDC from plug J33 pin -2(+) to plug J33 pin -10(-) at the display board receptacle.

13.If either of these voltages are low or not pre- sent, the control board may be faulty. Replace. Also Perform the Power Board Test.

14.Remove the input power to the V450-PRO machine.

15.Replace any cable ties previously removed.

16.Replace the case front.

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FIGURE F.15 - Plug J33

PLUG J33

5 10

4 9

J33

3

8

 

2 7

1 6

INVERTEC® V450-PRO

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Lincoln Electric SVM199-A service manual SPI Cable Resistance and Voltage Test Procedure, Plug J33

SVM199-A specifications

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