Tweco 42 CutMaster Service Manual - Manual (Page 42)

Troubleshooting 6-6 Manual 0-5171
CUTMASTER 42 TROUBLESHOOTING
6.06 Visually Inspect
Visually inspect the inside of the Power Source. The levels of current present in these units can cause burning or arcing
of PCB, transformers, switches, or rectifier when a failure occurs. Carefully inspect all components within these units.
Look in particular for the following:
a) Loose or broken wires or connectors.
b) Burned or scorched parts or wires or evidence of arcing.
c) Any accumulation of metal dust or filings that may have caused shorting or arcing.
If any parts are damaged, they must be replaced. Refer to the Spare Parts section for a complete list of components
used in the Power Source.
Locate the faulty component(s) then replace where necessary.
6.07 Preliminary DC Bus Measurement of the Main Inverter Board
!
Read and follow safety information in Section 6.02 before proceeding.
DC Bus Testing Multimeter Lead Placement Voltage with Supply voltage OFF
Upper capacitor bank
Positive meter lead to testpoint 30
Negative meter lead to testpoint 29
0 VDC
Lower capacitor bank
Positive meter lead to testpoint 32
Negative meter lead to testpoint 31
0 VDC
Table 6-1 DC BUS, Multimeter set to measure DC volts