TROUbLESHOOTING | ||
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| Observe all Safety Guidelines detailed throughout this manual |
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CHECKING POWER ON/OFF SWITCH (S1)
1.Turn off the machine input power (" o "position).
SW1 has 115 volts across it when the input power is connected.
2.Isolate the switch to be tested by removing all co- nnecting leads.
3.Check to make sure the switch is making open and closed connections with a V.O.M. meter. Put ohm meter on X1 scale. The meter should read zero resistance with switch " I " and infinite with switch
" o "
4.Put the ohmmeter on X1K scale and measure the resistance between the terminal and the case of the machine (touch a
5.If either step (3) or step (4) fails, replace the switch.
CHECKING OUTPUT CONTROL RHEO- STAT ON MACHINE (R1)
1.Turn machine off (" o " position).
2.Remove the screws from the hinged control panel and open the panel.
3.Turn the LOCAL/REMOTE CONTROL switch to "REMOTE".
4.With an ohmmeter on X1K, connect it to lead 236 and 237 on R1.
5.Exercise caution to avoid damaging rheostat tabs.
6.Rotate the OUTPUT voltage control rheostat. The resistance reading should be from around zero to 10K ohms. Check the resistance reading between the two outer tabs on the rheostat (leads 236 and 75). The reading must be 10K "10% ohms. No reading will indicate an open rheostat and a low reading will indicate a shorted or partially shorted rheostat; in either case, replace.
CONNECTING REMOTE OUTPUT CONTROL RHEOSTAT TO THE MACHINE
Extreme caution must be observed when installing or extending the wiring of a remote control. Improper connection of this unit can lead to loss of control and/or poor welding. Only the green lead can and should be grounded to the machine case. When extending the standard remote control, make sure the leads are the same and the splice is waterproof. Be very careful not to ground the cable when in use and don't let the lugs touch against the case.
CHECKING REMOTE OUTPUT CONTROL RHEOSTAT
Disconnect the remote output control and connect an ohmmeter across 75 and 76 and rotate the rheostat in the remote control. The resistance reading should go from zero to 10K ohms. Repeat with ohmmeter across 77 and 76 with same results. Connect ohmmeter across 75 and 77. The reading should be 10K "10% ohms. A lower reading will indicate a shorted or par- tially shorted rheostat. A very high reading will indicate an open rheostat. In either of the last two cases, replace rheostat. Check cable for any physical dam- age.
P.C. bOARD TROUbLESHOOTING GUIDE VRD P.C. bOARD
1.LED’s 4 and 5 indicate power being supplied to the P.C. board from the 42 volt winding on the main transformer (T1), but only when the machine is in
CCmode. If LED 4 and 5 are not “ON” while in CC mode, turn the machine off, check the wiring back to the 42V transformer winding and check the mode switch. If the LED’s are on when the machine is in CV mode then a wiring error exists. (For Codes 11598, 11613 only)
2.With the power on, change mode switch from CV to
CC.LED 2 must be ON for the initial 5 seconds, and then LED 3 should turn “ON”. LED 3 indicates that the machine is ready to weld. LED 3 also indi- cates when 48V has been exceeded by turning “OFF” until the power is cycled.
3.When LED 3 is “ON”, LED 1 should then turn “ON” when the electrode touches the work.
CAUTION
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.
IDEALARC®