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F-29

TROUBLESHOOTING AND REPAIR

F-29

 

DC BUS BOARD TEST(CONTINUED)

 

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6.Check the DC Bus Board input and output voltages according to Table F.4. See Figure F.6 and the Wiring Diagram.

WARNING

ELECTRIC SHOCK can kill.

High voltage is present at the ter- minals of Capacitor C3 near where testing is to be done.

7.If all the voltages are correct, the DC Bus Board is operating properly.

8.If any of the output voltages are not correct and the input voltage is correct, the DC Bus Board may be faulty.

9.If the input voltage is not correct, check the leads between the DC Bus Board and the Bus Rectifier. See the Wiring Diagram.

10.When finished testing, replace the case wraparound cover.

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TABLE F.4 – DC BUS POWER SUPPLY PC BOARD VOLTAGE TABLE

Positive Meter Probe

Negative Meter Probe

Approximate Voltage

Conditions/Comments

Test Point

Test Point

Reading

 

 

 

 

 

 

Plug P46 – Pin 1

Plug P46 – Pin 3

65

– 75 VDC

Should be same as the

Lead 65

Lead 66

 

 

Bus Rectifier

 

 

 

 

 

 

 

 

Plug P47 – Pin 8(+)

Plug P47 – Pin 1(-)

38.0

– 42.0 VDC

Supply to the Wire

Lead 52

Lead 51

 

 

Feeder Receptacle

 

 

 

 

 

Plug P47 – Pin 3(+)

Plug P47 – Pin 6(-)

38.0

– 42.0 VDC

Supply to Power Board

Lead 477

Lead 475

 

 

 

 

 

 

 

 

POWER WAVE 355M/405M

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Lincoln Electric 355M, 405M service manual Table F.4 DC BUS Power Supply PC Board Voltage Table