Lincoln Electric IDEALARC DC-1500 Service Manual page 56

F-22
CONTROL TRANSFORMERS (T2, T3 & T4) VOLTAGE TEST PROCEDURE
Test Point (From)
Lead 203
Lead 205
Lead 207
PROCEDURE
1. Turn the DC-1500 machine off.
2. Remove the input power to the DC-1500.
3. Remove the left case sides.
4. Locate the Control Transformers T2, T3 & T4.
See Figure F.5.
5. Locate the TS1 Terminal strip. See Figure F.5.
6. Check to make sure the correct input power is
being applied to the primary windings of the
Control Transformers. Note that the phasing of
the Control Transformers is very important.
They provide input power and SCR firing infor-
mation to the Firing Board. Make certain that
both the primary windings and secondary wind-
ings are connected properly.
Diagram.
TROUBLESHOOTING AND REPAIR
(continued)
TABLE F.1
Test Point (To)
Lead 204
Lead 206
Lead 208
See Wiring
IDEALARC® DC-1500
Expected Reading
7. Apply the correct input power to the machine
and carefully check for the correct secondary
voltages at the TS1 terminal strip. See Table
F.5. See Wiring Diagram.
8. If any of the secondary voltages are missing or
incorrect, check for loose or faulty connections.
See Wiring Diagram. If the leads and connec-
tions are good and the correct input voltages
are being applied to the primary windings, the
Control Transformer may be faulty.
9. Also make sure that the leads and connections
between the TS1 terminal strip and 12 pin con-
nector on the firing board are good.
Wiring Diagram.
10. When testing is complete, replace the left case
sides.
F-22
115 VAC
115 VAC
115 VAC
See