Plug j2 pin 6 (+) pin 2 (-) pin 7 (+), Troubleshooting & repair, Control input test (continued) – Lincoln Electric COMMANDER SVM145-B User Manual
Page 120: Warning, Test procedure
TROUBLESHOOTING & REPAIR
F-64
F-64
COMMANDER 300
CONTROL INPUT TEST
(continued)
FIGURE F.30 – PLUG J2
G3002-1
COMMANDER 300
CONTROL
Q1
C1
C54
C2
C25
X4
X8
X2
X10
X12
X13
X18
X11
X5
X19
X1
J1
J2
J3
J4
TEST PROCEDURE
1. Turn the engine off.
2. Perform the Case Cover Removal and
3. Tilt the control panel out.
4. Locate the J2 connector on the control
board. See Figure F.30.
5. Start the machine.
6. With a voltmeter, measure the following volt-
ages from J2 pin 6 (pos. lead) to J2 pin 2
(neg. lead) at the control board. See Table
F.2.
ELECTRIC SHOCK CAN KILL.
• Do not touch electrically
live parts such as output
terminals or internal wiring.
• Insulate yourself from the
work and ground.
• Always wear dry insulating
gloves.
7. Set the Arc Force dial in the min. position, the
Range Selector switch to the CC position, and
the Control dial to min.
8. Short the output studs.
9. Using a voltmeter, measure 4.378 - 4.648
VDC from J2 pin 7 (pos. lead) to J2 pin 2 (neg.
lead). Set the Arc Force dial in the max. posi-
tion. Measure 8.352 - 8.868 VDC from J2 pin
7 (pos. lead) to J2 pin 2 (neg. lead). The short
circuit output current should increase as the
Arc Force dial is turned from min to max. See
Figure F.30.
10. Remove the short and turn the engine off.
11. If any of the voltage checks fail, proceed to
the continuity check section.
12. Locate and disconnect J4 at the control
board. See Figure F.30.
13. Set the range selector switch in the CV posi-
tion.
Plug J2
Pin 6 (+)
Pin 2 (-)
Pin 7 (+)
WARNING