SYNTHESIS TECHNOLOGY
PAGE
9
MOTM-110 ASSEMBLY
WWW.SYNTHTECH.COM
You are now finished with the Organic flux solder. All soldering past this point is
using the No-Clean solder. You do not have to wash the board anymore.
PART #6: FINISHING THE PCB
You will now solder in the remains parts on the pcb in preparation for wiring to the front
panel. USE THE NO-CLEAN SOLDER. BE CAREFUL!
Locate the 3 blue trim pots in the
MISC #1
bag. Solder into TP1, 2, & 3.
Locate the 4 Spectrol #148 pots (metal shafts). They are all 100K.
IMPORTANT
:
in order for the pc board to properly align into the front panel, each pot must be
absolutely flat on the pc board, with the shafts pointing away from the pc board.
Solder the pots into VR2 - 5. Clip the leads off.
Locate the
WIRE
bag. Note that the pre-stripped wires all have a short end and
a longer end. THE SHORT END GOES IN THE PC BOARD.
Locate the white/orange twisted pair. Solder the WHITE wire into JP2, in the hole
marked GND (square pad).
Solder the ORANGE wire short end into JP2, in the CV hole.
Locate one of the red/black twisted pairs. Solder the RED short end into S1,
into the top hole (round).
Solder the BLACK short end into S1, bottom hole (square).
Solder the other red/black twisted pair as before into S2.
Locate the 5 pieces of RG-174 black coax cable. Again, note that one end has
longer wires stripped than the other. The short ends will go in the pc board in
positions J2 to J6. Look at the pc board. Notice that in positions J2 - J6, there
is a large hole pad (lower pad) and a smaller pad (top hole). The braided wire
is soldered into the larger hole. The smaller, inner conductor goes in the top
hole.
Note there is a row of ‘plain’ holes along the bottom, under J2 - 6. These holes are
for
threading the small white tie-wraps for holding the coax against the pc board. The
holes are designed so that coax exits the pads from the right side. The coax then lies
in between the 2 holes. The tie wrap enters the left hole from the top, comes out
the right hole from the bottom, and is then secured so that the coax is tightly
held against the top of the pc board. Note that the tie wraps must thread from the
top, or there may not be sufficient room between the pc board and the mounting
bracket. The excess tie wrap is cut off.
