Lincoln Electric RANGER 250 SVM150-A Service Manual page 90

F-40
TEMPERATURE
SWITCH
W8
W9
POWER
MODULE
PC BOARD
POSITIVE (+)
STRAP
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. See Figure F.17.
5. Using the 7/16" wrench, remove the flex
leads W8 and W9 from the Power Module PC
board terminals.
TROUBLESHOOTING & REPAIR
POWER MODULE TEST (continued)
FIGURE F.17 – POWER MODULE CONNECTIONS
RANGER 250
6. Using the 7/16" wrench, remove the two pos-
itive jumper straps attaching the capacitors to
the Power Module PC board. Note all lead
placements for reassembly. Note lead #253,
#13, W4 and W5 do not have to be removed
from the circuit. See the Wiring Diagram.
The small flex lead connected to D4 should
be removed and electrically isolated.
7. Using the 7/16" wrench, remove the W6 lead
strap from the power module (two bolted con-
nections). Suggestion: First loosen the
straps at the capacitor terminals and remove
the nuts on the power module. Then fold the
straps back out of the way.
NOTE: Make sure the bolts do not fall back
against the heat sink.
F-40
POSITIVE (+)
STRAP
W6