Lincoln Electric INVERTEC POWER WAVE 450 SVM112-B Service Manual page 88

F-28
AUXILIARY TRANSFORMER TEST #1 (continued)
TEST PROCEDURE
1. Remove main input supply power to the
machine.
2. With the 3/8" nut driver, remove the 4
screws that hold the handle to the machine.
3. Remove the rubber gasket (cover seal) from
the lift bail.
4. With the 5/16" nut driver, remove the sheet
metal screws from the case top.
5. With the 5/16" nut driver, remove the
screws holding the right and left case sides.
Remove the case sides by lifting up and
out.
6. Perform the Capacitor Discharge Proce-
dure described earlier in this section of the
manual.
WARNING
Before continuing with the
test procedure, perform the
capacitor discharge proce-
dure to avoid electric shock.
TROUBLESHOOTING & REPAIR
FIGURE F.5 - TRANSFORMER T1 AND T2 LOCATION
POWER WAVE 450
1. AUXILIARY TRANSFORMER T1, PLUG
J5 LOCATED IN BASE
2. PROTECTION BOARD
3. PLUG J30
4. AUXILIARY TRANSFORMER T1
7. After you have completed the capacitor
discharge procedure for all four switch
boards, remove the PC board cover. Use
the 5/16" nut driver.
8. Remove plug J5 from the T2 transformer
located in the machine base assembly.
This is a 6-pin molex plug with 5 wires;
see Figure F. 5 for location. T2 is con-
nected in parallel with T1. Leaving the two
transformers connected in parallel for the
test might result in incorrect readings;
therefore plug J5 should be disconnected.
9. Remove plug J30 from the protection
board. See Figure F.1 for location of the
board and plug J30.
10. Remove the 5 leads ( 3 heavy and 2 small)
T1, T2, T3 from main input contactor CR1.
This is a safety precaution. It prevents
high voltage from being put on the
machine during the test.
around the lead ends to insulate them and
prevent them from touching.
F-28
Wrap tape