Hammond HX3.5 XB2 Retrofit Kit User manual

HX3.5 Hammond XB2 Retrofit Kit
The basic kit consists of the following components:
HX3.5 mainboard (variant XB Kit), four Spax screws 3x12mm, four spacer sleeves 5mm, two wire end
sleeves for power cable, 5 core crimp cable with 10pin connector.
Interface board 1 with 6.3mm jacks, 6 core crimp cable 25cm for swell pedal and foot switch
connection, 3 core crimp cable 40cm for audio out, 16 core ribbon cable 25cm for pots.
Interface board 2 for keyboard, drawbars, buttons, mod wheel and pitch wheel, two Spax screws
3x12mm, two spacer sleeves 5mm, two 10 core ribbon cables 20cm, 10 core ribbon cable 23cm, 16
core ribbon cable 33cm.
USB extension to screw on.
Cable ties, heat shrink tubing.
Optional additions:
Control board with rotary encoder and up/down buttons, two black screws M3, 6 core ribbon cable
35cm.
WiFi kit for wireless operation via TouchOSC on smartphone or tablet (iOS, Android), antenna with
screw base.
HX3.5 Extension Board (variant XB Kit, only needed for 11pin Leslie output), two Spax screws
3x12mm, two spacer sleeves 5mm, 14 core ribbon cable 66cm
The installation of the control board requires five precise drill holes (2x 3.2mm, 2x 7mm, 1x 14mm) in the
steel profile to the right of the display. Alternatively or additionally, the control can be done wirelessly via
our WiFi interface using TouchOSC. Both options are described in this manual.
Tools required:
Small slotted screwdriver (blade <3mm), Phillips screwdriver PH1, Torx screwdriver T10, Hexagon
screwdriver 2mm, flat nose pliers or combination pliers, flat side cutter, center punch, steel drill bit 3mm.
For installation of the optional control board with encoder: steel drill bit 3.2mm, steel drill bit 7mm, step drill
bit (>14mm).
Decoring the XB2
Loosen the 5 large screws on the bottom. Then the
wooden lid can be removed.

XB2 Kit Installation 2
Disconnect the keyboard connector from the motherboard
and remove the keyboard.
The keyboard is attached with 7 medium-sized screws
(M4) on the bottom and inside.
Make sure that no screw gets lost and remember which
screw goes where.
The interface board on the rear panel is no longer required
and can be removed. Disconnect all plug connections and
remove the board.
Disassemble the MIDI connector board and put it aside.
This board will be reinstalled later.
Remove the circuit board with the 6.3mm jacks, the
potentiometers and the jack for the expression pedal.
The socket for the expression pedal may be attached with
plastic rivets. Pinch these off on the inside with the side
cutter.

3 XB2 Kit Installation
Disconnect all connectors and remove the
large main board and the boards to the right of
it.
Remove all cable ties holding various harnesses together.
The metal rails can also be removed and sent
for disposal.
Only the power supply, the MIDI connection
board and the boards with the controls at the
front and in the left end block remain.
Remove the knobs from the Bass and Treble
pots and attach them to the pots on Interface
Board 1.

XB2 Kit Installation 4
Installation of the control board (optional)
To install the optional control board with rotary
encoder next to the display, holes must be
drilled. To do this, remove the steel profile on
which the display is located. First you must
remove the left end block with the drawbars. It
is attached to the base with four wood screws
from above and two long plastic screws from
below. Disconnect the cable to the front panel
from the slot on the end block.
To place the drill holes precisely, they must be punched. For this
purpose, print out the drilling template shown opposite. Check
the dimensions to ensure that the printout is on a scale of 1:1,
i.e. that it has not been enlarged or reduced. Cut out the drawing
along the contour lines.
Place the metal profile upside down on a soft
surface so that it does not get scratched.
Attach the drawing with adhesive tape in the
center of the metal surface, about 6cm next to
the display, with some distance to the screwed-
on strut.
Center punch the five drill holes at the
positions marked with crosses. Pre-drill all five
with 3.2mm. Then enlarge the two drill holes
for the buttons to 7mm. Enlarge the drill hole
for the encoder to 14mm with the step drill.
Deburr the holes on both sides with the step
drill.
Now fasten the control board with the two black screws and connect the 6 core cable. Reassemble the
steel profile with the display and the left end block. When doing so, do not neglect to reattach the ground
connection under the screw on the left and restore the cable connection between the two assemblies.

5 XB2 Kit Installation
Installing the components
Where the socket for the expression pedal was located, the USB
socket is installed in the rear panel. For this, drill two 3mm holes
at a distance of 29mm close to the existing drill holes, but offset
upwards by about 1mm.
Install the interface board 1. If you want to use
the optional HX3.5 Extension Board, plug the
connector with the long 14 core cable ribbon
into PL16 beforehand. Connect the connector
of the 11pin Leslie socket to PL17 and the
three connectors from the pots at the front to
PL12, PL14 and PL18.
Plug the USB cable into the socket on the
HX3.5 board. Place the board close to the
metal brace that supports the lid. Place the four
5mm spacers underneath and screw the board
to the floor with Spax screws.
If you use the optional extension board, screw
it right next to the HX3.5 mainboard. Connect it
with the short 26 connect the 6 core flat cable
and the 14 connect the 6 core flat cable
leading to the interface board 1.

XB2 Kit Installation 6
Connect the supplied cable with the white 10pin connectors to
PL18 on the mainboard and and PL19 on the interface board 1.
Hint: Refer to the illustration in the HX3.5 Installation Manual to
help locate the connectors on the HX3 mainboard.
Run the shorter of the 16 core ribbon cable from PL23 (ANALG
LWR) on the HX3 mainboard to PL5 on the interface board 1.
Use the 6 core crimp cable to connect PL30/PL31 on the
mainboard to PL7/PL8 on the interface board. Connect PL4 on
the mainboard to PL10 on the interface board with the 3 core
crimp cable.
The connection of the interface board 1 is now
completed and should look like on the adjacent
photo.
Now it's time to install the interface board 2. Screw it close to the left side of the HX3.5 mainboard.
Connect the white connectors leading to XB2
units, from left: 12pin connector with black
cables (Drawbar), 4pin connector (Pitch/Mod
Wheel), 5pin connector with black and yellow
cables (power supply), 9pin connector (LEDs),
10pin connector (buttons), 14pin connector
(display). The 6 core cable from the control
board, if present, goes to PL12 on the interface
board.
Make the connections to the HX3 mainboard
with the 10 core ribbon cables: PL7 goes to
HX3 PL9, PL9 to HX3 PL13, PL10 (panel) to
HX3 PL21. The 16 core cable goes from PL2
to HX3 PL22 (ANLG UPR).

7 XB2 Kit Installation
Run the yellow and the black cable for the power supply to the
HX3 mainboard. Shorten the cables to fit, remove 5mm of
insulation sheathing and press on the supplied wire end ferrules
with the pliers. Screw the ferrules into the green screw
connector. Please observe the polarity indicated by the cable
colors, see photo.
Fix the power cables with the white cable holders at the bottom
of the XB2.
You can now connect the power cable and
switch on the XB2 with HX3 soul for the first
time. The HX3 start message should now
appear on the display.
Take the opportunity to adjust display contrast
with the trimmer on the interface board 2.
Switch off the XB2 and disconnect the power
cable.
Identify the harness coming from the power supply with cables in
the colors yellow, black, green, black, orange and a 5-pin
connector. Plug this into the PL2 XB2 PWR connector on the
interface board 1.
Another cable harness remains from the power supply unit with
four connectors and six cables in the colors white, 2x black, 2x
orange, green. Cut this off at a distance of about 30 cm from the
power supply unit and insulate the cable ends with insulating
tape or heat shrink tubing.
Arrange all cables and fix them with cable ties and the white
cable holders at the bottom of the XB2.

XB2 Kit Installation 8
Fix the cables to the display and the buttons on the front tightly
with the black cable holder. There is only a narrow passage for
this cable bundle in the sheet metal profile under the keyboard.
Now reassemble the keyboard. First plug the connector into PL8
on the interface board 2. Be careful not to pinch any cables
when moving the keyboard into position. Fix the ground
connection with a toothed lock washer under the brass screw
near the power supply.
Installing the WiFi interface (optional)
If you do not use the WiFi interface, you can now install the MIDI
connector board unchanged and connect it to PL1 of the
interface board 1. You can omit the next five steps.
There is a trimmer for the display contrast on the MIDI
connection board, which is no longer needed. The hole in the
back panel can be used for the antenna of the optional WiFi
interface.
To install the antenna for the WiFi interface, remove the trimmer.
This can be done without desoldering: First cut off the rear
brackets with the side cutter, then the trimmer falls apart. Bend
the inner part backwards, then you can pinch off the three
connection wires.
Screw in the antenna socket on the rear panel, install the MIDI
connector board and connect it to the interface board 1.

9 XB2 Kit Installation
Remove the blue protective film from the double-sided adhesive
foam plate and attach it to the edge under the antenna socket on
the back of the WLAN module.
Carefully press the plug of the antenna cable onto the antenna
socket of the WLAN module until it snaps firmly into place.
Remove the second protective foil from the double-sided
adhesive foam plate, plug the WLAN module onto the PL33 slot
of the mainboard and press it onto the USB socket on the other
side.
The conversion of the Hammond XB2 to a HX3
organ is now complete.
Now you can put the lid back on and affix it to
the bottom with the five large screws.
Download the User Manual HX3_XB2 if you have not already done so.
Using the manual, attach the stickers from the stickers sheet to the
controls of the XB2.
Screw the WiFi antenna into its socket. Then you can put the organ into operation with a new soul.
The KeyboardPartner team hopes you enjoy!