Lincoln Electric IDEALARC CV-305 - Manual (Page 46)

TROUBLESHOOTING & REPAIR F-14 F-14
IDEALARC® CV-305
MAIN TRANSFORMER TEST PROCEDURE
(CONTINUED)
TEST PROCEDURE
The ON/OFF POWER SWITCH will be "hot" during
these tests.
____________________________________
NOTE: Secondary voltages will vary proportionally with
the primary AC input voltage.
1. Disconnect the main input power to the machine.
2. Remove the case roof and case side panels.
3. Test for correct three-phase voltage being applied
to the main transformer.
a. If the correct three-phase voltage is being
applied to the main transformer, continue test.
b. If the incorrect three-phase voltage is not being
applied to the main transformer, correct before
proceeding with test.
4. Locate plug J3 on the Control PC Board.
5. Locate the following leads on plug J3: #200, #201,
#202, and #203.
6. Re-connect main input power to the machine.
7. Turn the ON/OFF POWER SWITCH to ON.
8. Test for 12 VAC
a. Insert the meter probes carefully into the back
of each Molex Plug pin cavity until electrical
contact is made to perform the test.
9. Locate lead # 33 connected to circuit breaker CB2
and pin "J" (lead #31) on the 14 pin amphenol con-
nector located on the Case Front. See Figure F.1.
10. Test for 115 VAC between lead #33 at circuit
breaker and pin "J" (lead #31) on the amphenol
connector.
a. If voltage is missing, check for loose or broken
wires between test points and main trans-
former. See CV-305 wiring diagram.
b. If voltage is present, continue test.
CIRCUIT BREAKER
CB2 (LEAD #33)
FRONT PANEL
14 PIN AMPHENOL
CONNECTOR (PIN J)
WARNING
FROM LEAD
#200
#202
TO LEAD
#201
#203
FIGURE F.1 - Main Transformer Test Points
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