Lincoln Electric SVM153-A service manual Temperature Switch, W10

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F-47	F-47
	TROUBLESHOOTING & REPAIR

POWER MODULE TEST (CONTINUED)

FIGURE F.21 – POWER MODULE CAPACITOR LEADS (LEFT SIDE)

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TEMPERATURE SWITCH

W9

W10

POWER

MODULE

PC BOARD

DIODE

LEAD D4

POSITIVE (+)

STRAP

POSITIVE (+)

STRAP

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TEST PROCEDURE

1.Turn the engine off.

2.Perform the Case Cover Removal proce- dure.

3.Perform the Power Module Capacitor Discharge procedure.

4.Using the 7/16" wrench, loosen the nuts on the positive terminals of the power capaci- tors. Then remove the nuts, lock washers, and flat washers from the terminals where the positive straps connect to the power module PC board. Flip the straps out of the way. Also remove diode lead D3 (if working on right side power module) or D4 (if work- ing on left side power module). See Figure F.21.

5.Using the 7/16" wrench, remove the flex leads W9 and W10 (left side) or W7 and W8 (right side) from the Power Module PC board terminals.

6.Using the 7/16" wrench, remove the nega- tive jumper strap attaching the power capac- itors to the Power Module PC board.

NOTE: Make sure the bolts do not fall back against the heat sink.

COMMANDER 500