CIGWELD 250i Transmig, Service Manual

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TRANSMIG 250i DISASSEMBLY
DISASSEMBLY 7-8 Manual 0-5188
7.09 Main PCB Removal
Read and follow safety information in Section 6.03 before proceeding with dis-
assembly. Follow anti static precautions when handling any PCB (Printed Circuit Board).
Unplug the unit before beginning disassembly procedure.
Disconnect and blead off any Shielding Gas pressure from the system before starting this procedure.
1. Disconnect the Shielding Gas solenoid valve from the HS Fan shroud (#1). You will need to cut the clamp to
the right of the valve, remove the hose and then the nut holding the valve in place. You will also need a new
clamp when reassembling.
2. Remove Input Power Switch/Circuit Breaker. See subsection "7.03 Input Power Cord and Power Switch / Circuit
Breaker Removal" for instructions on this. This is to get access to mounting screw in upper right corner of
the Main PCB.
3. Remove the two (2) bottom screws holding the rear panel to the power supply. Pull the rear panel back enough
to gain better access to the Main PCB.
4. Label and note all wires attached to the Main PCB and remove them. This will include wires from the MOV PCB
that go to the EMI PCB and one to the Ground stud with the input power cable ground wire.
5. Remove the seven (7) screws that mount the Main PCB to the center chassis(#5) . Four (4) of the screws hold
the HS Fan shroud to the Main PCB.
#5
Figure 7-14: Main PCB Mounting Screw Location