WhitakerAudio J C Whitaker 20 W Stereo Audio Amplifier, Manual, Page: 127 / 194

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20 W Stereo Audio Amplifier
– Move the power management PWB into position above the four 2.5-inch standoffs. Check
to make sure no wires are crimped or otherwise stressed.
– Install the #6 screws and lockwashers in the two front-facing mounting holes of the power
management PWB. Leave the screws loose for now.
– Install the #6 screws in the two rear-facing mounting holes of the power management
PWB. Use a lockwasher on one screw and a ground lug on the other. Tighten all four
mounting screws.
– Find the black #22 wire connected to the GND post on the power management PWB.
Connect to the available ground lug on the main ground point on the back panel. Do not
solder.
– Prepare a 3-inch black #18 wire. Connect one end to the available ground lug on the back
panel. Solder (4 wires). Connect the other end to the ground lug on the power management
PWB. Solder.
The power management PWB has now been completed. Check to be sure that the board
mounts flat on the standoffs. It may be necessary to reorient the cable bundle under the board to
achieve a proper fit.
5.6.13 Power Management Expansion Board
Slide the power management expansion PWB into place. Secure with six 1/4-inch 4-40 screws.
Tighten the mounting screws after all screws have been threaded.
– Cut a 14-inch long #18 black wire. Attach one end to the ground lug on the upper rear
corner of the power management expansion board. Solder. Route the free end to the rear
panel ground point using the available cable clamp. Secure to one of the available ground
lugs and solder.
In the following steps, 4-pin Molex connectors (0.1 pitch) will be used. After stripping the
cable, place a short (approximately 3/4-inch long) piece of heat-shrink tubing on each end of the
audio cable. For the end of the cable inserted into the Molex connector, process (apply heat) after
the wires have been inserted into the connector but before the cable is installed in the amplifier.