Lincoln Electric INVERTEC POWER WAVE 450 SVM112-B Service Manual page 138

F-78
SNUBBER AND BLEEDER RESISTOR TEST (continued)
C. With the volt/ohmmeter, check for 25
ohms resistance between lead #404 and
#9F.
If the measurement reads between 20 and
30 ohms, resistor R4 and leads #404 and
#9F are okay. Go to step D.
If the measurement does not read between
20 and 30 ohms, check for continuity in
leads #404 and #9F. Then test for 25 ohms
resistance across R4 directly. If the mea-
surement does not read between 20 and
30 ohms, replace resistor R4.
D. Reconnect quick connect terminals #403,
#404, #9, and #12 on switch board 2.
Switch Board 3: (Switch Board 3 is Marked
CAP 1 on the Switch Board Assembly
Connection Decal - See Figure F.24.)
A. Remove quick connect terminals #405,
#406, #9, and #12 from switch board 3.
B. With the volt/ohmmeter, check for 25
ohms resistance between lead #405 and
#12G.
If the measurement reads between 20 and
30 ohms, resistor R5 and leads #405 and
#12G are okay. Go to step C.
If the measurement does not read between
20 and 30 ohms, check for continuity in
leads #405 and #12G. Then test for 25
ohms resistance across R5 directly. If the
measurement does not read between 20
and 30 ohms, replace resistor R5.
C. With the volt/ohmmeter, check for 25
ohms resistance between lead #406 and
#9G.
If the measurement reads between 20 and
30 ohms, resistor R6 and leads #406 and
#9G are okay. Go to step D.
If the measurement does not read between
20 and 30 ohms, check for continuity in
leads #406 and #9G.
ohms resistance across R5 directly. If the
measurement does not read between 20
and 30 ohms, replace resistor R5.
D. With the volt/ohmmeter, check for 7.5 K-
ohms resistance between lead #12G (12M)
and #9G (9M).
TROUBLESHOOTING & REPAIR
Then test for 25
POWER WAVE 450
If the measurement reads between 6.75
and 8.25 K-ohms, resistor R10 and leads
#12G (12M) and #9G (9M) are okay. Go to
step E.
If the measurement does not read between
6.75 and 30 K-ohms, check for continuity
in leads #12G (12M) and #9G (9M). Then
test for 7.5 K-ohms resistance across R10
directly. If the measurement does not read
between 6.75 and 8.25 K-ohms, replace
resistor R10.
E. Reconnect quick connect terminals #405,
#406, #9, and #12 on switch board 3.
Switch Board 4: (Switch Board 4 is Marked
CAP 4 on the Switch Board Assembly
Connection Label - See Figure F.24.)
A. Remove quick connect terminals #407,
#408, #9, and #12 from switch board 4.
B. With the volt/ohmmeter, check for 25
ohms resistance between lead #407 and
#12H.
If the measurement reads between 20 and
30 ohms, resistor R7 and leads #407 and
#12H are okay. Go to step C.
If the measurement does not read between
20 and 30 ohms, check for continuity in
leads #407 and #12H. Then test for 25
ohms resistance across R3 directly. If the
measurement does not read between 20
and 30 ohms, replace resistor R7.
C. With the volt/ohmmeter, check for 25
ohms resistance between lead #408 and
#9H.
If the measurement reads between 20 and
30 ohms, resistor R8 and leads #408 and
#9H are okay. Go to step D.
If the measurement does not read between
20 and 30 ohms, check for continuity in
leads #408 and #9H.
ohms resistance across R8 directly. If the
measurement does not read between 20
and 30 ohms, replace resistor R8.
D. Reconnect quick connect terminals #407,
#408, #9, and #12 on switch board 4.
8. Install the machine case sides and top.
9. Install the handle and the lift bail rubber
gasket.
F-78
Then test for 25