Lincoln Electric IDEALARC SP-255 Service Manual page 69

F-16
4. Locate the following leads on Plug J3
on the Control Board.
G2801:
5. Connect main input power to the ma-
chine.
6. Turn the Idealarc
POWER SWITCH to ON.
7. Make the following voltage tests at
Plug J3.
a. Turn the machine OFF between
b. Carefully insert the meter probes
G2801:
8. Turn OFF the machine
FROM
LEAD
#202
(1J3)
#202
(1J3)
#203
(3J3)
9. Locate the following leads on Plug J6
on the G2801 Control PC Board.
See Figure F.1.
G2801:
10. Turn ON the machine.
11. Make the following voltage tests at
Plug J6 on the G2801 Control PC
Board.
TROUBLESHOOTING & REPAIR
MAIN TRANSFORMER TEST
LEAD PLUG
LOCATION
#202 1J3
#203 3J3
#204 A 2J3
SP-255 ON/OFF
®
each test.
into the back of each Molex Plug
pin cavity to perform the test.
TO EXPECTED
LEAD VOLTAGE
#203 30 VAC
(3J3)
#204 A 15 VAC
(2J3)
#204 A 15 VAC
(2J3)
LEAD PLUG
LOCATION
#206 4J6
#208 16J6
#209 7J6
IDEALARC
a. Turn the machine OFF between
each test.
b. Carefully insert the meter probes
into the back of each Molex Plug
pin cavity to perform the test.
G2801:
c. If any of the voltages tested are
FROM TO
LEAD LEAD
#208 #209
(16J6) (7J6)
#208 #206
(16J6) (4J6)
#209 #206
(7J6) (4J6)
incorrect, check for loose or bro-
ken leads between the test
points and the main transformer.
d. If ALL the voltages tested are in-
correct or missing, go to Step 12.
12. Test for correct nameplate input volt-
age between the H1 lead at the
ON/OFF POWER SWITCH to H2 or
H3 at the reconnect panel. Voltage
tested will vary depending on Input
Voltage Connection. See wiring dia-
gram for test point locations.
a. If the voltage test is incorrect,
- check for loose or broken
leads between the reconnect
panel and the ON/OFF POWER
SWITCH.
- test the ON/OFF POWER
SWITCH for proper operation.
b. If the correct nameplate voltage
is being applied to the main
transformer and one or more of
the secondary voltages are
missing or are incorrect, the
main transformer may faulty.
Replace.
® SP-255
F-16
EXPECTED
VOLTAGE
60 VAC
30 VAC
30 VAC