7. CONNECTING THE PICKUPS AND WIRES TO THE
PREAMP.
Check the circuit board of the preamp and see the picture at
these instructions for connections. Connect the pickups, battery
cable harness and the output cable. Notice that the small holes
on each connector of the transducer and battery cable harness
should point upwards. If UST or AST is connected improperly
a loud audible hum will occur. make sure that they are con-
nected correctly.
When transducer, battery wire and output cable are connected
to preamp, close the cover by inserting to of the tabs of one
side of the back cover to the slots of one side of the preamp
box. Then push to insert the tabs of the opposite side to close. If
difficult to push the tabs into place it may be necessary to bend
the tabs a little so that it will fit. It is recommended to test the
systems operation at this point. Insert a battery and connect the
output cable to amplifier. You should hear it from the amplifier
when you tap on the transducer.
8. INSTALLING THE PREAMP
For the next portion of the installation, be careful not to catch
the pickup on anything as you work; inadvertent tugging may
cause damage to the transducers or pull the connectors off the
pin headers at the preamp.
Note where the hole for the access to the pickup’s input gain
control is at the back of the preamp. This will be helpful in lo-
cating it later if adjustment is needed. The control is set at the
factory at approximately 50 / 50 blend of the pickups.
Regarding AST, please note to lift one corner of the protective
layer of the mounting adhesive so it is easier to remove later.
Take the preamp assembly inside the guitar and install it to its
place. Let the transducer(s) and wire harnesses hang loose in-
side the guitar at this moment. Install the front plate and attach
the screws. It is important that you have a good quality screw-
driver to avoid it slipping during tightening and thus scratching
the guitar. Be careful to tighten the screws properly. It may be
wise to tape the area around the front plate with masking tape
in case you slip with the screwdriver. Do not over-tighten the
screws as it may strip the screws, or crack the side of your gui-
tar or the preamp’s faceplate.
At the output jack unscrew the strap attachment, the small
nut and the small dress washer from the endpin jack. make
sure that the large nut; lock washer and large dress washer are
threaded onto the jack almost all the way to the opposite end of
the output of the jack.
Next, test-fit the jack the endpin hole. It is easier to install the
output jack by using an ink pen (or something similar) that fits
into the jack. Put the pen through the hole at the guitar where
the jack will go and with the other hand holding the output jack,
and that going through the sound hole, put the jack on the pen
and guide it through the hole of the guitar. Adjust the large
nut so that only the smaller threaded section comes almost
entirely out of the guitar. Put the dress washer and the small
nut onto the threads outside the guitar. Tighten securely using
