Thermal Arc 300GTSW Pro-Wave, Service Manual

Page: 78 / 130

pro-wave 300gtsw
6-40
June 21, 2012
2. To test the primary of T1, measure the continuity
between Main Circuit Board connector CN8 pin 2
and the lugged transformer lead removed from
TB1.
3. To test the primary of T2, measure the continuity
between Main Circuit Board connector CN9 pin 2
and the lugged transformer lead removed from
TB2.
The secondaries of T1 and T2 cannot be isolated. To test
the parallel combination of secondaries:
4. Measure the continuity between the connector
CN7 pin 3 and CN5 pin 3.
Replace the Main Transformer/Inductor Assembly if no
continuity is found in any of the windings or if there is
evidence of overheating.
Art # A-06138
Figure 6-38: T1/T2 primary lead routing through ferrite ring
Q1-C2E2/T1
Primary Lead
(Green Mark)
Q2-C2E2/T2
Primary Lead
(Green Mark)
TB2-T2 Primary Lead
TB1-T1 Primary Lead
Art # A-06137
Figure 6-37: Preparation for removal of main transformers T1/T2 (right side of unit from front)
6.35 Main Transformer Assembly (T1
and T2) Test Procedure
!
WARNING
Disconnect primary power at the source before
performing this procedure.
Inspect the primary winding wires on both Main
Transformers for breaks in the insulation, signs of
overheating or loose connections.
Check for continuity across the primary windings of both
transformers.
to do this, do the following:
1. Remove the lugged leads from TB1 and TB2. See
Figure 6-37.