Figure 13.12 Typical Gate-Source And Drain-Source Waveforms For Fets - Tait TB8100 Service Manual

Task 4 —
Check Gate Signals
of PFC and HVDC
FETs

Figure 13.12 Typical gate-source and drain-source waveforms for FETs

Q305 and Q306
Q201 and Q202
244 Power Management Unit Fault Finding
1. Check the gate signals (gate-to-source) of all four FETs (Q201,
Q202, Q305, Q306) individually. If the signals match the wave
forms shown in
the AC module and go to
Important
Ensure the oscilloscope is floating before earthing the oscil-
loscope at the source of Q201. Do not test the
gate-to-source signal of both Q201 and Q202 simultane-
ously. If the oscilloscope is not floating, do not test the
gate-to-source signal of Q201.
Figure 13.12, go to Step
"Final Tasks" on page
© Tait Electronics Limited September 2006
2. If they do not, replace
247.
TB8100 Service Manual