Lincoln Electric POWER WAVE SVM156-A Service Manual page 117

F-71
OUTPUT RECTIFIER, STT CHOPPER BOARD AND RECTIFIER MODULE
REMOVAL AND REPLACEMENT (CONTINUED)
FIGURE F.27 – OUTPUT RECTIFIER, STT CHOPPER BOARD AND RECTIFIER MODULE
RECTIFIER ASSEMBLY
REMOVAL PROCEDURE
1. Remove input power to the Power Wave
455/R.
2. Using the 3/8" nut driver, remove the case
top and sides.
3. Perform the Capacitor Discharge proce-
dure.
4. Using the 9/16" wrench, remove the Power
Wave positive output lead from the rectifier
heat sink.
reassembly. Refer to Figure F.27.
TROUBLESHOOTING & REPAIR
REMOVAL AND REPLACEMENT
PLUG J10
STT LEAD
POSITIVE
OUTPUT
LEAD
Note fastener hardware for
POWER WAVE 455/R
THERMOSTAT
(LEADS 291 & 292)
LEAD 287
(SNUBBER
DIODE)
HEATSINK
5. Using the 7/16" wrench, remove the STT
output lead from the rectifier heat sink. Note
fastener hardware for reassembly. Refer to
Figure F.27.
6. Using the 7/16" wrench, remove the eight
transformer leads from the rectifier modules.
Label the leads and take note of lead place-
ment for reassembly. Note that each screw
has two flat washers and one lock washer.
RECTIFIER
LEAD 289B
(STT SNUBBER
CAPACITOR)
TRANSFORMER
LEADS
RECTIFIER
MODULE
HEATSINK
MOUNT
BOLTS (4X)
F-71