Plug J3 - Lincoln Electric INVERTEC V350-PRO Service Manual

F-46
SPI CABLE RESISTANCE AND VOLTAGE TEST (continued)
TEST PROCEDURE
1. Remove the input power to the V350-PRO.
2. Using the 5/16" nut driver, remove the case
wraparound cover.
3. Perform the Capacitor Discharge Procedure.
4. Perform the
Procedure. Do not remove the SPI ribbon
cable connecting the display board to the
remote/status boards.
5. Locate and remove plug J3 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 J3 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.
J3
TROUBLESHOOTING AND REPAIR
Display Board Removal
FIGURE F.15 Plug J3
8. Reconnect the plug into the control board and
perform the Display Board Replacement
Procedure.
9. With plug J3 still removed from the control
board, carefully apply the correct input power
to V350-PRO.
10. Turn on the machine.
11. Carefully check for the presence of +15VDC
from plug J3 pin -1(+) to plug J3 pin -10(-) at
the control board receptacle. See Figure F.15.
12. Carefully check for the presence of +5VDC
from plug J3 pin -2(+) to plug J3 pin -10(-) at
the control board receptacle. See Figure F.15.
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 V350-PRO
machine.
15. Replace plug J3 into the control board.
16. Replace any cable ties previously removed.
17. Replace the case wrap-around cover.

Plug J3

Pin 10
V350-PRO
F-46
Pin 1
Pin 2