Tweco 42 CutMaster Service Manual - Manual (Page 52)

Troubleshooting 6-16 Manual 0-5171
CUTMASTER 42 TROUBLESHOOTING
6.15 Waveforms
1. Vds of inverter IGBT at no load
Test point C1: 4 and 5 C2: 9 and 10 (Testpoints refer to inverter PCB diagram in Sec. 6.13).
Timebase Trigger
Stop
Positive
Art # A-10247
2. Vds of inverter IGBT at full load
Test point C1: 4 and 5 C2: 9 and 10 (Testpoints refer to inverter PCB diagram in Sec. 6.13 ).
Timebase Trigger
Stop
Positive
Art # A-10248
6.16 Main Circuit Description
!
Turn off power and disconnect mains supply plug from receptacle before working on the unit. Allow two minutes for
capacitors to discharge after disconnection from mains supply voltage.
PFC Control Chip
AC
AC
V+
V-
U1
DC+
DC-
DC+
DC-
dc+
dc+
Art # A-10249