Page 28 of 80
5V power and ground wire installation
Twist and tin the bare end of the 14” red wire.
Twist and tin the bare end of the 14” black wire.
Insert the tinned 14” red wire from the bottom of the power supply board
into the TB9 hole marked +5V
and solder it on the top side.
Insert the tinned 14” black wire from the bottom of the power supply board
o the TB9 hole marked BGD
and solder it on the top side.
Connect Power Input wires and install the Power Supply
Locate the 22 AWG stranded wires that come from the switched outlet. Remove ¼” of
insulation from the ends. Twist and tin the free ends of the black and white wires.
1. Twist the insulated portion of the black and white wires together. Forming a
twisted pair like this minimizes hum.
2. Insert the white wire into the hole marked AC2 on the component side of the
power supply PCB, and solder that wire on the solder side. Cut off any extra lead
length on the solder side.
3. Insert the black wire into the hole marked AC1 on the component side of the
power supply PCB, and solder that wire on the solder side. Cut off any extra lead
length on the solder side.
4. Install the power supply PCB into the chassis. For now, loosely install just one
screw, the 4-40x0.25” zinc plated (silver colored) SEMS screw through the PCB
hole nearest the back corner of the chassis into the stand-off on the chassis floor.
The AC1 and AC2 terminals will be next to the back corner of the enclosure.
Installing just one screw allows you to swing the PCB out of the way to make
installing the transformer easier.
5. Fasten the transformer to the right side wall of the preamp in the manner shown in
Figure 19. This operation may be easier if you turn the chassis on its side so that
gravity helps you. Prevent scratches on the side of the chassis by setting it on a
towel.
6. Wiggle the transformer to make sure it is centered on the dished washer. Rotate
the transformer so the wires point towards the back of the chassis, as this makes
the wires to the power supply PCB lay most naturally.
7. Set the chassis back on its feet. Use the supplied 4-40X0.25” zinc plated (silver
colored) SEMS screws (built-in lock-washer) through the 3 remaining mounting
holes and into the stand-offs mounted in the chassis.
8. Tighten the screw at the back corner of the PCB that was installed in step 4.
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