DYNACO PAT-5 Manuale di montaggio - Pagina 16

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DYNACO PAT-5 Manuale di montaggio

Testing the power supply in place

Testing the new power supply
Done? ()
Reconnect wires 5, 6, and 8 from the transformer to the new power supply
PCB. Insert them from the component side and solder them on the solder
side.
Clean-up and make sure that no tools are inside the preamp. You're about to
power it on to test the output voltages. Remember to be safe, as potentially
lethal voltages will be present in the next step.
Plug the PAT-5 into the AC power socket. Note: There are potentially lethal
voltages inside the PAT-5 from the instant it is plugged in, regardless of the
state of the ON-OFF switch!
Be alert for any signs of distress or smoke from the new power supply. If
everything looks good, then move on to the following tests.
Measure DC voltage from pin 3 to pin 1. It should be 15 Volts, plus or
minus 1 volt.
Measure DC voltage from pin 7 to pin 1. It should be -15 Volts, plus or
minus 1 volt.
Measure DC voltage from pin 4 to pin 1. It should be 42 Volts, plus or
minus 2 volts.
Unplug the power cord and let the caps discharge for a minute before going
on.
Reconnect wires 1, 2, 3, 4, and 7 to the new power supply PCB. Insert them
from the component side and solder them on the solder side. Don't remove
the wire tag until you double check that the wire is in the correct place.
Dress these wires so they cross the zig-zag shield on top of the plastic edge
guard. This will keep the wires from wearing through and shorting to
ground.
Inspect the inside of the preamp to make sure that there are no tools or wire
bits left behind that could cause short circuits.
Be safe as you plug in the AC cord. Remember that lethal voltages will be
present inside the preamp.
Verify that the power supply output voltages are still in tolerance after
connecting the power supply to the rest of the preamp.
Measure DC voltage from pin 3 to pin 1. It should be 15 Volts, plus or
minus 1 volt.
Measure DC voltage from pin 7 to pin 1. It should be -15 Volts, plus or
minus 1 volt.
Measure DC voltage from pin 4 to pin 1. It should be 42 Volts, plus or
minus 2 volts.
Unplug the power cord and let the caps discharge for a minute before going
on.
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