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Section 3: Tone Control Switch
Before You Begin
It's important to check C16 for leakage. The quickest and easiest way to do so is to rotate
the bass control while the PAT-4 is connected to your power amp and speakers. Listen
carefully for a scratching sound as you rotate the Bass pot.
If you hear the scratching sound on either channel, then clean the bass pot using a spray
cleaner. If the scratching sound persists, then C16 for both left and right channels should
be replaced. More details can be found in the section "Pops and Clicks" on page 17.
Pre-wiring the Tone Control Switch
This section covers the pre-wiring of the tone control switch. Figure 5 contains a large
diagram of the switch wiring. Cross check the directions here with the diagram.
Prepare the following 6 wires:
1. 6" length of red wire, then strip ¼" of insulation from one end
2. a second 6" length of red wire, then strip ¼" of insulation from one end of this
wire also.
3. 6" length of green wire, then strip ¼" of insulation from one end
4. a second 6" length of green wire, then strip ¼" of insulation from one end of this
wire also.
5. 6" length of black wire, then strip ½" of insulation from one end.
6. a second 6" length of black wire, then strip ½" of insulation from one end of this
wire also.
Refer to Figure 5. Make sure you have oriented the switch as shown in the Figure. The
ALPHA designation, stamped in the metal, must be facing up.
1. Bend a hook in the ¼" uninsulated portion of a red wire, insert it through the
upper BASS 1 hole, and crimp it in place. Solder the wire.
2. Bend a hook in the ¼" uninsulated portion of the second red wire, insert it
through the upper BASS 3 hole, and crimp it in place. Solder the wire.
3. Place the ½" uninsulated portion of a black wire into the upper BASS 2 hole, and
continue with the same uninsulated portion of that wire, inserting it in the adjacent
terminal, as marked by the yellow line in Figure 5. Solder the wire to both
terminals.
4. Dress the wires from steps 1-3 off to the right, keeping them together. A piece of
masking tape around the wires may be helpful.
5. Bend a hook in the ¼" uninsulated portion of a green wire, insert it through the
lower BASS 1 hole, and crimp it in place. Solder the wire.
6. Bend a hook in the ¼" uninsulated portion of the second green wire, insert it
through the lower BASS 3 hole, and crimp it in place. Solder the wire.
7. Place the ½" uninsulated portion of a the remaining black wire into the lower
BASS 2 hole, and continue with the same uninsulated portion of that wire,
Page 10 of 20
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