SYNTHESIS TECHNOLOGY
PAGE
8
MOTM-110 ASSEMBLY
WWW.SYNTHTECH.COM
Locate the 10mfd electrolytics. Note that there is a stripe on the NEGATIVE
terminal. The pc board has a + on the POSITIVE terminal. Carefully stick the
capacitors into C1, C4 and C5 with the stripe
away
from the + pad on the board.
PART #4: MISC STUFF
Almost done with the parts on the pc board! This will finish up the soldering with the
organic flux.
Locate the
MISC
#1
bag and the
IC
bag.
Locate the ferrite beads. They are axial parts, gray colored with no markings. These
are non-polar, and are soldered into L1 and L2.
Locate the 18 pin DIP socket. Solder it into the U1 location (CEM3330). There is a
small notch on one end of the socket: this is the ‘PIN #1’ end. Locate U1 on the pc
board. Note that Pin #1 is the square pad, and there is a notch on the silkscreen.
Locate the MTA-156 power connector. Solder into JP1. Note that the connector has
a ‘locking tab’ on one side. This side is the “inside” facing relative to the pc board.
Note the silkscreen symbol for JP1 has a line on one side, indicating this is the side
where the locking tab goes.
Locate the OP275 op amps. Solder into U2 and U3. Note that Pin #1 is the square
pad. Pin #1 is the pin near the very small ‘dot’ in the top of the part. They are not in
sockets.
Locate the 1N4148 signal diodes. These are clear glass axial parts with a black
band around one end. Locate D1 and D2 on the pc board. Notice that the silkscreen
symbol has a distinct band on one end. Insert the banded end (called the cathode)
into the pc board in the correct pad.
PART #5: WASH THE BOARD AGAIN
Verify all the parts are in the correct locations. Check the diodes and C1, C4 & C5
orientation.
Inspect the solder joints. Any solder shorts? Too much solder? Missing joints?
Wash the board under warm water. Scrub gently. Dry.
THIS IS A GOOD STOPPING PLACE TO REST OR PUT THE KIT AWAY UNTIL
LATER.
