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Check your work
Look over the board to verify that:
1. All components are soldered.
2. No solder bridges are apparent.
3. Polarity of the electrolytic capacitors is correct.
4. The right regulator is in the right location.
5. The heatsink hardware is tight.
6. Diode polarity is correct.
If everything looks good, you’re ready to install the power supply into your PAT-5.
Removing the Old Power Supply
The mechanical design of the PAT-5 Preamp makes removing the old power supply a lot
of work. Your soup bowl will come in handy again as a safe place to collect all the bits
and pieces you’ll need to remove to change the power supply.
Figure 7-Remove hardware that holds power supply bracket to chassis floor
All of the following steps have the goal of removing the power supply and the power
supply wall, allowing replacement of the old power supply with the new.
Note: You will re-use the 4-40 screws in your kit, so be sure to save them. However, we
have supplied 4-40 keps nuts. A keps nut has a captive lock-washer. These keps nuts
will replace the separate nuts and lock-washers originally used for PAT-5 assembly.
Prepare to remove the old power supply
Pull the Preamp’s AC plug and wait 1 minute
Remove the two screws (one in each bracket) that hold the silver colored
power supply mounting brackets to the bottom of the chassis. Easiest access
is from the screws at the bottom of the chassis
Remove the four side screws that hold the back panel to the bottom of the
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