Positive Grid Spark 40 User manual
Spark 40 Footswitch Mod
MODZ
PHASE 1
THE
FOOTSWITCH
THE
CABINET
THE
AMP
THE
TEST
PHASE 2 PHASE 3 PHASE 4
The Footswitch
Strip all the components from the
Randall footswitch. Sand and paint
whatever color.. I chose flat black.
Punch 3/4” hole on either side for
the panel mount RJ45 connector.
You may have to open the hole up a
bit with Dremel tool or file. I also
used a fitted o-ring so that I could
have the outside connector flush
with the retaining nut.
Take one of your 3ft or 10ft
network cables and cut it in half.
One half will be used in the
footswitch, the other half will be
used in the amp later.
PDF for the dimensions on the panel mount RJ45
MODZ
The Footswitch
Prep all your momentary foot
switches with lock-tight.
Populate your newly painted
footswitch with the switches.
It shows the old switches with L
Strip jacket 8”, tin & solder each pair to
each switch, install strain relief.
Solder connections:
Blu/bluwht for 1, Org/orgwht for 2,
Grn/Grnwht for 3, Brn/Brnwht for 4
Screw the cover and base back together.
The footswitch is done.
MODZ
The Cabinet
Remove the right speaker Choose your location on the back
plate and trim the coating just over
¾” so that when you use your
paddle bit you don’t tear up the
jacket. Remove the back plate and
drill the 3/4” hole.
Now use the backplate as your
template and trace your cabinet thru-
hole on the back of the cabinet.
Place back plate aside.
MODZ
The Cabinet
With the backplate removed use
a 1-1/2” paddle bit to open the
pass-thru hole for the RJ-45
connector
Carefully remove the circuit
board. Be mindful of the
Bluetooth cable and speaker
cable. Unplug the speaker cable
to allow you to rotate the board
out of the way for the next step.
Just to the left of the speaker cable
pass-thru drill a ½” hole into the
lower cavity. Make sure the wiring
below is out of the way. The new
pass-thru is for the internal network
cable that will routed and soldered
to the circuit board.
MODZ
The Cabinet
Connect the other half of
the network cable that you
cut in half and feed it thru
up to the ½ hole to where
the circuit board is
With the connector and
cable installed, test fit the
back panel.
Remove the back panel again
and remove the circuit board,
disconnect the cable from RJ45
and set the back panel aside.
MODZ
The Amp
Looking down with the back of the amp
facing you, carefully position and secure
the circuit board. Strip the jacket 8”
off the routed network cable and
solder the assigned pairs to the
appropriate contacts.
Pin 1 –Color w/white stipe
1
2
Pin 2 –Solid Color
MODZ
The Test
The Test
To serve as strain-relief, zip tie the
pairs, and take 4” piece of electrical
tape to cover the contacts.
With a Digital Multimeter set to
Ohms, put you leads on pins 1
and 2 for each group of
contacts, and press each
appropriate footswitch,
testing all four switches.
To completely test the crcuit ,
connect pedal with the other
12’ network cable to the rear
RJ45 connector. Do not
reassemble the amp.
MODZ
The Test
Make sure to connect the
speaker connector before you
re-install the circuit board.
Re-assemble amp. Time to rock!
And now you can change
presets with your foot! Whoa!
MODZ
Other manuals for Spark 40
3
Table of contents
