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|
| TROUBLESHOOTING & REPAIR |
CHOPPER PC BOARD INPUT VOLTAGES AND
RESISTANCE TEST (CONTINUED)
FIGURE F.6 – POWER MODULE ASSEMBLY DETAILS
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CLAMP 
BRACKET
IGBT
HEAT
SINK
P45/45A 1 2 3
4 5 6
AMPS |
|
|
A |
|
|
|
| VOL |
LINCOLN |
| TS |
V |
| |
ELECTRIC |
|
|
MULTI- |
|
|
WELD | 350 | |
|
| |
INPUT |
|
|
CHOPPER |
|
|
TECHNOLOGY |
|
|
WORK |
| ELECTRODE |
DIODE
MODULE
D3
REMOVE CASE BACK PANEL TO ACCESS HEAT SINK TEST POINT (4 SCREWS)
+
-
| COPPER |
| CAPACITOR |
| POSITIVE |
| STRAP |
DIODE | COPPER |
D5 | CAPACITOR |
| NEGATIVE |
| STRAP |
| LEADS |
| #X1 |
| #X4 |
| #401 |
| #401A |
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TEST PROCEDURE
1.Set the CC/CV power switch to OFF.
2.Remove input power to the machine.
WARNING
ELECTRIC SHOCK can kill.
Disconnect input power before removing the case cover and performing tests or making repairs to the machine.
3.Perform the Case Cover Removal proce- dure.