Befaco FXBOY V1 User manual

FXBOY V1 - ASSEMBLY GUIDE – Rev. Sepl. 2023
THANKS FOR CHOOSING ONE OF OUR KITS!
This manual has been written taking into account the common issues that we often find people experience in our
workshops. The order in which the components are placed on the board is meant to make assembly as easy as possible.
Some steps are not obvious, so even if you're an experienced DIYer please read the steps thoroughly before starting.
If this is your first project, please read this article before you start assembling the kit:
www.befaco.org/howto/
You will be soldering both boards at the same time. Keeping them in the panel together might help you through the build.
Check last pages of the Build for PCB pics to help you identify components.
HAVE FUN!
RESISTORS
Color code can be difficult to identify, we strongly recommend to use a multimeter.
Qty
Value
Code
Name on PCB
66
100k
Brown, black, black, orange, brown
R1, R2, R6, R7, R9, R10, R11, R13, R14, R15, R16, R21,
R22, R23, R24, R25, R28, R29, R30, R31, R34, R39, R40,
R41, R42, R43, R44, R45, R46, R47, R48, R49, R50, R51,
R52, R53, R55, R56, R61, R64, R67, R68, R69, R70, R72,
R74, R76, R78, R81, R83, R84, R85, R88, R93, R94, R95,
R97, R98, R99, R100, R102, R103, R105, R106, R107,
R108
8
18k
Brown, gray, black, red, brown
R12, R27, R35, R36, R37, R38, R101, R104
6
20k
Red, black, black, red, brown
R4, R17, R109, R110, R111, R112
4
150k
Brown, green, black, orange, brown
R63, R89, R91, R92
4
68k
Blue, gray, black, red, brown
R58, R60, R62, R80
4
47k
Yellow, violet, black, red, brown
R33, R57, R87, R96
3
200k
Red, black, black, orange, brown
R26, R32, R71
3
1k
Brown, black, black, brown, brown
R18, R19, R54
2
56k
Green, blue, black, red, brown
R3, R5
2
33k
Orange, orange, black, red, brown
R59, R66
2
16k
Brown, blue, black, red, brown
R75, R82
2
2k7
Red, violet, black, brown, brown
R77, R79
1
820K
Gray, red, black, orange, brown
R20
1
330k
Orange, orange, black, orange, brown
R90
1
300k
Orange, black, black, orange, brown
R73
1
220k
Red, red, black, orange, brown
R86
1
22k
Red, red, black, red, brown
R65
1
3k3
Orange, orange, black, brown, brown
R8
1

FXBOY V1 - ASSEMBLY GUIDE – Rev. Sepl. 2023
DIODES
Solder the diodes observing their polarity. The black or white line on the diode must match with the white line on the
diode symbol on the PCB silkscreen.
Qty
Value
Name on PCB
4
1N4148
D1, D2, D3, D4
2
1N5817 (black)
D5, D6
FERRITE
To solder the two ferrite beads use a recycled resistor leg passed through each ferrite and proceed as if it were a resistor.
Ferrite beads don't have polarity.
Qty
Name on PCB
2
F1, F2
IC SOCKETS
Place the sockets (taking care to orientate them properly – the notch should match the image on the silkscreen) and
solder them into their correct positions.
Qty
Value
Name on PCB
10
DIL8
IC1, IC2, IC4, IC5, IC6, IC7, IC8, IC17, IC22, IC23
10
DIL14
IC3, IC9, IC10, IC12, IC13, IC14, IC15, IC16, IC18, IC19
1
DIL16
IC11
CAPACITORS
Identifying capacitors can be quite tricky. Codes stated are indicative, please take a look at this guide for help identifying
capacitors: http://www.wikihow.com/Read-a-Capacitor
Qty
Value
Code
Name on PCB
48
100nf
104
C2, C3, C7, C8, C9, C12, C17, C18, C19, C21, C24, C26, C28, C30, C31, C32, C38,
C40, C41, C43, C50, C53, C55, C57, C58, C59, C65, C66, C69, C70, C74, C75, C76,
C79, C81, C83, C85, C90, C91, C92, C93, C94, C95, C96, C97, C98, C102, C103
24
10pF
10
C1, C6, C10, C11, C13, C14, C15, C16, C20, C22, C23, C25, C27, C29, C33, C34, C52,
C54, C56, C60, C77, C78, C82, C84
11
1nF
102
C4, C44, C45, C46, C47, C48, C49, C61, C62, C63, C64
8
4n7
4n7
C37, C39, C42, C51, C67, C71, C73, C80
2
2n2
2n2
C68, C72
1
33nf
33nk100
C36
1
10nf
10nk100
C35
2

FXBOY V1 - ASSEMBLY GUIDE – Rev. Sepl. 2023
ELECTROLYTIC CAPACITORS
Values are written on the side of the capacitor. Mind their polarity (The long leg of the capacitor is the positive (+)).
Qty
Value
Code
Name on PCB
9
10uF
10uF
C5, C86, C87, C88, C89, C99, C100, C101, C104
VOLTAGE REGULATORS
This Regulator ICs look like transistors (but they are not) This shape is better known as TO-92 Package. Used mostly for
transistors but also many other devices.
Watch Polarity!
Qty
Value
Name on PCB
1
78L05
IC20
1
TL750L10CLP
IC21
PIN HEADERS
Place and solder the Pin Headers on the silkscreen side of the main board (It is the shorter pins that you are soldering).
Double check they all are perfectly straight.
Qty
PINs
Name on PCB
2
2x7
JP7, JP8
1
2x6
JP5
1
2x3
JP6
SOCKET CONNECTORS
Place the socket connectors on the control board over the silkscreen markings at positions and solder. Double check they
all are perfectly straight.
Qty
PINs
Name on PCB
2
2x7
JP1, JP2
1
2x6
JP3
1
2x3
JP4
POWER CONNECTOR
Solder the power connector at “POWER” ensuring it is facing out from the edge of the PCB.
3

FXBOY V1 - ASSEMBLY GUIDE – Rev. Sepl. 2023
ICs
Place the ICs in their respective sockets taking note of their orientation – the notch or dot on the top of the IC must
match that of the socket and silkscreen.
Qty
Value
Name on PCB
9
TL072
IC1, IC2, IC4, IC5, IC6, IC7, IC8, IC17, IC22
6
TL074
IC3, IC9, IC12, IC14, IC15, IC18
4
AS3360
IC10, IC13, IC16, IC19
1
4053N
IC11
1
NE5532
IC23
Now it’s a good moment to split the boards apart.
SPACERs
Secure the spacers onto the CONTROL PCB (through the 3 holes with silver outline) with the main body of the spacer on
the component side, and the nut on the mechanical side.
You’re nearly at the end, but the next part is critical and takes a good bit of concentration. If you’re
feeling a bit strained, a break would definitely help. Reply to those unread messages or prove
someone wrong in Internet, for example. Mechanical parts are really delicate and will need your full
attention.
FRONT PANEL COMPONENTS MOUNTING TIPS:
Now we will proceed to mount mechanical parts to panel. This part of the assembly is CRITICAL. Please take your time
and read the following instructions carefully.
These components must NOT be soldered until they are placed on the PCB and fully attached to the front panel!!!
There are two reasons for this:
The height of the panel components are not all the same. Because of this, if not attached properly before
soldering, they will not stay properly seated against the panel. This might cause mechanical stress reducing their
life expectancy and in the worst case cause them to break.
The second reason is that it is very difficult to align the components to the holes if the panel is not positioned
prior to soldering.
POTENTIOMETERS
Now place the potentiometer on the PCB but... don't solder them yet!
Qty
Type
Name on PCB
9
Single (3pin) B10k
DW, H, L, MH, ML, X, XX, Y, YY
4

FXBOY V1 - ASSEMBLY GUIDE – Rev. Sepl. 2023
SWITCHES
Place the switches in their right places. Don't solder them yet!
Qty
Type
Name on PCB
1
Mini. One circuits two position
SWPP
1
Mini. 2 circuits two position
S1
MINI-JACKS
Place the mini-jacks on the PCB ensuring they are on the side with the silkscreen. Don't solder them until the front panel
is in place with all nuts screwed to it. This way it's easier to solder them in the right position. Keep in mind that the front
panel holes are quite narrow and it is almost impossible to place it with all the components already soldered.
LED
Place the LEDs onto main PCB minding its polarity, but don't solder them until the front panel is in place. This is the
only way to solder them the right position.
Qty
Type
Name on PCB
1
LED Bicolour 3mm
Led_1
FRONT PANEL
Attach the front panel adjusting the parts one by one if necessary until it fits. At this point a pair of fine tweezers can be
helpful.
To Finish:
- Screw in the parts in this order: A) Mini-jacks B) Pots.
- Ensuring all of the above parts are flush with the panel and both PCB and panel are perfectly parallel. Then you can
finally solder them!
- Fit the LED on the panel hole and solder them.
- Connect Middle board with the control board, screw 3 spacers on the spacers of the control board , securing the pcb
between the spacers.
- Place the cartridge connector on the bottom board but don't solder them, attach this board to the middle board and
check the alignment of all the boards.
-Place a cartridge on the connector, check
- Put the knobs on the potentiometers and the red caps on the switches/Faders.
- Connect the power ribbon cable: The red wire (-12V) on the power ribbon cable corresponds to pin number one on the
male power connector. The number one pin is indicated with a small triangle on the male power connector and a white
line on the main PCB. A white or black line (or “-12v”) marked on your power bus normally indicates the corresponding
pin.
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FXBOY V1 - ASSEMBLY GUIDE – Rev. Sepl. 2023
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FXBOY V1 - ASSEMBLY GUIDE – Rev. Sepl. 2023
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FXBOY V1 - ASSEMBLY GUIDE – Rev. Sepl. 2023
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FXBOY V1 - ASSEMBLY GUIDE – Rev. Sepl. 2023
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