Crown Pulse 2X1100 Supplementary Manual page 16

Diagram 4. Temporary resistor.
8. Replace the power cord and try the power supply again. It should start. You can measure the DC supply rails at the link
points.
9. Switch off the unit and bridge the isolating links between the PSU and amplifier stages with solder. Switch on the unit.
10. If the unit goes into protect mode, there is another fault in one or more channels. If the unit powers up correctly, inject a 1
kHz 1.5 dBu signal into Channel 1. Monitor the output (off load) for a clean sine wave.
11. Then use the second channel of the oscilloscope to monitor the case of the MJ15024 device. As you increase the output
from the amplifier, you should see a waveform similar to that shown below.
12. Move the second channel monitor to the case of the MJ15025 devices. Check that the waveform is similar to that shown
below.