Lincoln Electric POWER WAVE C300 Service Manual page 45

F-26
SWITCH BOARD TEST PROCEDURE (continued)
Description
LED 1
LED 4
LED 3
LED11
LEDs 5 thru 10
PROCEDURE
1. Disconnect the input power to the POWER
WAVE® C300 machine.
2. Perform the Case Cover and DC Link
Capacitor Discharge Procedure.
WARNING
High voltages are present on and
around the switch board. Take the
appropriated safety precautions
when performing the following pro-
cedures.
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3. Locate the switch board on the left side of the
machine. See Figure F.7.
4. Carefully apply the correct input power to the
POWER WAVE® C300. Check the LEDs per
Table F.4. See Figure F.8 for LED locations.
5. If the LEDs are not indicating a properly func-
tioning switch board (per TABLE F.4.) proceed
with the following steps.
TROUBLESHOOTING AND REPAIR
TABLE F.4 - SWITCH BOARD LED's
Indicates
+48VDC Supply
+15VDC Supply
Boost Circuit
Active
Buck Circuit
Active
Chopper IGBTs
activated
POWER WAVE® C300
Light
ON
ON
ON*
ON**
ON***
6. Check the voltages per Table F.5. See Figure
F.9 for test point locations.
7. Check the switch board resistances per Table
F.6. See Figure F.9 for test point locations.
8. If any of the above tests are not correct the
Switch may need to be replaced.
9. Replace all plugs and leads that were previ-
ously disconnected.
10. Replace the case covers.
F-26
Conditions
Power applied to
PW C300
Power applied to
PW C300
*When high input
voltage is applied
(460 and higher)
LED3 may be very
dim or off
** Brilliance may
vary with load
*** Brilliance will
vary with load and
output.