Lincoln Electric IDEALARC IM420-D - Manual (Page 23)

E-7 TROUBLESHOOTING E-7
IDEALARC® DC-1000
If for any reason you do not understand the test procedures or are unable to perform the tests/repairs safely, contact your
Local Lincoln Authorized Field Service Facility for technical troubleshooting assistance before you proceed.
CAUTION
MACHINE HAS OUTPUT
(Jumper 2-4) BUT TRIPS
OFF IMMEDIATELY
CHECK FOR SHORT CHECK LEADS
BETWEEN ELECTRODE AND 73, 74, 75, 76, 77 FOR
WORK LEADS, REMOVE GROUND TO
EXTERNAL LEADS FROM NEGATIVE OUTPUT
THE OUTPUT TERMINALS TERMINAL
IF TROUBLE STILL PERSISTS,
CHECK LED 3 ON
CONTROL BOARD
IF LIGHT GOES ON, THEN
QUICKLY OUT WHEN START
BUTTON IS PRESSED,
CONTROL BOARD IS
DEFECTIVE AND SHOULD
BE REPLACED
ERRATIC WELDING
CHECK PROCEDURE
CHECK MODE SWITCH FOR PROPER POSITION FOR
PROCESS BEING USED
CHECK LED’S 1 THRU 6 FOR EQUAL BRILLIANCY
IF LIGHTS ARE NOT ALL APPROXIMATELY EQUALLY
BRIGHT, REPLACE FIRING P.C. BOARD
OUTLINE FOR DC-1000 TROUBLESHOOTING GUIDE
If troubleshooting guide indicates a possible P.C.
board problem, the following guide can be used to
locate the problem.
NO WELDER OUTPUT (INPUT CONTACTOR “ON”. 2 AND 4 CLOSED)
CHECK CONTROL BOARD
LED5
IF OFF
CHECK LED1
IF ON
CHECK FIRING BOARD
LED’S
ALL
NINE LIGHTS
SHOULD
BE ON
IF OFF IF ON
CHECK AC REPLACE
INPUT TO CONTROL
CONTROL BOARD
BOARD -
POSSIBLE
DEFECTIVE
T2 TRANSFORMER
IF YES IF NO
CHECK GATE LEAD CHECK LIGHTS
CONNECTIONS 7,8,9
TO SCR’S
IF ONE IF ON AND
OR MORE OTHER LIGHTS
ARE OUT ARE OUT
CHECK AC INPUT
TO BOARD, REPLACE
203-204, 205-206 FIRING
207-208 -- POSSIBLE BOARD
DEFECTIVE
AUXILIARY
WINDINGS ON MAIN
TRANSFORMER
CHECK FOR OPEN
IN LEADS 203, 204
205, 206, 207, 208