Lincoln Electric 9919 Operator's Manual page 23

E-7
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)
IF OFF
CHECK LED1
IF OFF
CHECK AC
INPUT TO
CONTROL
BOARD -
POSSIBLE
DEFECTIVE
T2 TRANSFORMER
MACHINE HAS OUTPUT
(Jumper 2-4) BUT TRIPS
OFF IMMEDIATELY
CHECK FOR SHORT
BETWEEN ELECTRODE AND
WORK LEADS, REMOVE
EXTERNAL LEADS FROM
THE OUTPUT TERMINALS
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
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.
TROUBLESHOOTING
CHECK CONTROL BOARD
LED5
IF ON
REPLACE
CONTROL
BOARD
CHECK GATE LEAD
CONNECTIONS
TO SCRʼS
CHECK LEADS
73, 74, 75, 76, 77 FOR
GROUND TO
NEGATIVE OUTPUT
TERMINAL
CHECK MODE SWITCH FOR PROPER POSITION FOR
CHECK LEDʼS 1 THRU 6 FOR EQUAL BRILLIANCY
IF LIGHTS ARE NOT ALL APPROXIMATELY EQUALLY
CAUTION
IDEALARC® DC-1000
IF ON
CHECK FIRING BOARD
LEDʼS
ALL
NINE LIGHTS
SHOULD
BE ON
IF YES
IF ONE
OR MORE
ARE OUT
CHECK AC INPUT
TO BOARD,
203-204, 205-206
207-208 -- POSSIBLE
DEFECTIVE
AUXILIARY
WINDINGS ON MAIN
TRANSFORMER
CHECK FOR OPEN
IN LEADS 203, 204
205, 206, 207, 208
ERRATIC WELDING
CHECK PROCEDURE
PROCESS BEING USED
BRIGHT, REPLACE FIRING P.C. BOARD
E-7
IF NO
CHECK LIGHTS
7,8,9
IF ON AND
OTHER LIGHTS
ARE OUT
REPLACE
FIRING
BOARD