Thermal Arc 300GTSW Pro-Wave, Service Manual

Page: 79 / 130

pro-wave 300gtsw
June 21, 2012
6-41
6.36 Main Transformer (T1 and T2)
Assembly Replacement Procedure
to remove Main transformer t1 or t2:
1. Remove the Main Circuit Board per page 6-13.
2. Remove MAIN CIRCUIT BREAKER and shield, per
page 24.
3. Cut cable ties securing T1 or T2 primary leads
(WHITE) to ferrite ring (L1). See Figure 6-37
4. Cut cable ties securing insulating sheath on
TB1 (T1) or TB2 (T2) at the BLACK/WHITE lead
junction.
5. Remove the hardware from the BLACK/WHITE
primary lead junction, and remove the lead from
the ferrite ring.
6. Remove the WHITE primary lead from the terminal
on Q1 (T1) or Q2 (T2).
7. Turn the unit on its side and feed the two WHITE
primary leads down through the hole in the chassis
in preparation for removing the transformer(s).
8. Remove the Output Inductor Assembly section
6.37 page 6-42.
9. Bend the secondary center tap leads of both
transformers T1 and T2 (“D)” up to expose the
“C” and “E” secondary lead junctions. See Figure
6-39
10. Remove the hardware from the “C” and “E”
secondary leads.
11. Remove the two (2) screws securing the
transformer plastic frame to the metal mounting
bracket.
To replace Main Transformers T1 or T2, reverse the
removal steps.
NOTE
For proper phase connections to T1 and T2,
the primary leads marked with GREEN paint
connect to the IGBT Inverter terminals. Also
note the lead routing through the ferrite ring
(L1). Refer to figure 6-38.
T1/T2 Secondary Lead
Junction "E"
Blue Wire
(to HF Unit AC1)
T1/T2 Secondary Lead
Junction "D" (center tap leads
bent upward; two black lugged
leads to CN7-1 and CN5-3)
White Wire
(to CN7-3)
T1/T2 Secondary Lead
Junction "C"
Art # A-06131
Figure 6-39: Preparation for removal of main transformers T1/T2