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Service Manual
D602 Catch Diode
The catch diode is in place to help limit the excess voltage to the MOSFET to guarantee the parts ratings. If the
STB is victim to high mains this part is the first to fail trying to protect IC600.
If damaged primary replace the blast kit.
Healthy Drain Voltage on IC600
On a normal scope, it is normal to see a 4KHz jitter on the drain waveform. This is a feature of the PWM IC for
reducing EMI.
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