Lincoln Electric Classic 300 MP Service Manual page 35

LINCOLN ELECTRIC
DIAGNOSTIC LED FLASH CODES (LED TIED IN HARNESS AT CONTROL BOARD)
LONG SHORT
FLASH FLASH
2 1
2 3
3 2
3 3
4 2
4 1
5 1
4 3
DESCRIPTION
BATTERY VOLTAGE
APPLIED TO BOARD
REMOTE CONTROL
CIRCUIT (6-PIN)
REMOTE CONTROL
CIRCUIT (14-PIN)
LOCAL OUTPUT
CONTROL CIRCUIT
FLASHING
VOLTAGE
CV WELD
TERMINAL SWITCH
CIRCUIT
IDLER SWITCH
CC/CV MODE
SWITCH
OCV BOOST
SWITCH
EXCITER ROTOR
Table F. 2 – LED flash codes
DESCRIPTION
FIELD COIL SHORTED – FAULT CAN ONLY BE RESET BY RESTARTING WELDER.
WELDER OUTPUT SHORT CIRCUIT OR OVERLOAD, FAULT RESETS BY RESTARTING
WELDER.
NEGATIVE ARMATURE IN CVMODE CODE.
VArm>90V IN CVMODE AFTER CR2ENABLE.
CONTROL BOARD 18V SUPPLY IS UNDER 16.2V.
CONTROL BOARD 36V SUPPLY IS UNDER 29.2V.
CONTROL BOARD SERIAL COMMUNICATION ERROR.
CONTROL BOARD 15V SUPPLY UNDER CODE.
Table F. 3 – Control board voltage tests
TEST POINT (+)
J12 PIN 1
(LEAD 841)
J2 PIN 11
(LEAD 77A)
J2 PIN 12
(LEAD 77B)
J2 PIN 1
(LEAD 77)
J1 PIN 6
(LEAD 610)
J2 PIN 5
(LEAD 2)
J12 PIN 4
(LEAD 844)
J7 PIN 3
(LEAD 221)
J7 PIN 9
(LEAD 477)
J1 PIN 6
TEST POINT (-)
PLUG J12 PIN 2
(LEAD 842)
J2 PIN 10
(LEAD 75A)
J2 PIN 9
(LEAD 75B)
J2 PIN 2
(LEAD 75)
J1 PIN 7
(LEAD 600)
J2 PIN 6
(LEAD 4)
J12 PIN 2
(LEAD 842)
J7 PIN 4
(LEAD 222)
J7 PIN 2
(LEAD 476)
J1 PIN 7
Classic® 300 MP Service Manual
EXPECTED
READING
RUN STOP SWITCH
IN 'RUN' POSITION.
12 – 13 VDC
10 VDC ENGINE RUNNING.
10 VDC ENGINE RUNNING.
10 VDC ENGINE RUNNING.
12 VDC DURING FLASHING.
TERMINAL SWITCH
15 VDC
OPEN. ENGINE
12 VDC NOT RUNNING.
MODE SWITCH IN
36 VDC CC MODE (OPEN).
ENGINE RUNNING.
BOOST SWITCH IN
36 VDC CLASSIC MODE
12 VDC INITIAL ENGINE
CONDITIONS
ENGINE NOT
RUNNING.
CV WELD
RUNNING.
(OPEN).
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