Lincoln Electric POWER WAVE SVM156-A Service Manual page 68

F-22
DC BUS POWER SUPPLY PC BOARD TEST(CONTINUED)
6. Check the DC Bus Power Supply PC Board
input and output voltages according to Table
F.3. See Figure F.7 and the Wiring
Diagram.
TABLE F.3 – DC BUS POWER SUPPLY PC BOARD VOLTAGE TABLE
Positive Meter Probe
Test Point
Plug P46 – Pin 1
Plug P47 – Pin 7
Plug P47 – Pin 8
Plug P47 – Pin 4
Plug P47 – Pin 3
TROUBLESHOOTING & REPAIR
WARNING
ELECTRIC SHOCK can kill.
High voltage is present at the
terminals of Capacitor C3 near
where testing is to be done.
Negative Meter Probe
Test Point
Plug P46 – Pin 3
Plug P47 – Pin 6
Plug P47 – Pin 6
Plug P47 – Pin 2
Plug P47 – Pin 1
POWER WAVE 455/R
7. If all the voltages are correct, the DC Bus
Power Supply PC Board is operating prop-
erly.
8. If any of the output voltages are not cor-
rect and the input voltage is correct, the
DC Bus Power Supply PC Board may be
faulty.
9. If the input voltage is not correct, check
the leads between the DC Bus Power
Supply PC Board and the Power PC
Board Rectifier. See the Wiring Diagram.
10. When finished testing, replace the case
top.
Approximate Voltage
Reading
65 – 75 VDC
38.0 – 42.0 VDC
38.0 – 42.0 VDC
38.0 – 42.0 VDC
38.0 – 42.0 VDC
F-22
Conditions/Comments
Should be same as the
Power PC Board
Rectifier
Supply to Power PC
Board
Supply to Power PC
Board
Supply to Feed Head PC
Board
Supply to S1 Wire
Feeder Receptacle