Lincoln Electric WIRE-MATIC SVM 117-A Service Manual page 67

F-14
STATIC SCR RECTIFIER ASSEMBLY TEST (CONTINUED)
TEST PROCEDURE
1. Disconnect main AC input power to
the machine.
2. Disconnect Plugs J3 and J6 from
the G2332 Control Board.
electrically isolates the SCR bridge
assembly. See Figure F.2.
WM-250 CONTROL
G2332
J1 J10
J7
FIGURE F.2 - Remove Plugs J3 and J6
to Perform Static SCR Rectifier
Assembly Test.
3. Verify that the capacitors have com-
pletely discharged with an Analog
Volt-Ohm meter.
4. Disconnect leads X2 and X3 from
the negative capacitor bank using a
1/2" open end wrench. See Figure
F.3.
TROUBLESHOOTING & REPAIR
J3
REMOVE
PLUGS J3 & J6
J9
J6
J4
J5
J2
WIRE-MATIC 250
This
NEGATIVE
CAPACITOR
BANK
BUSS BAR
FIGURE F.3 - Location of Leads X2
and X3.
5. Separate leads X2 and X3 from the
negative capacitor bank buss bar.
Be sure there is no electrical con-
tact. See Figure F.3.
F-14
LEADS
X2 AND X3