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Document revision 2.3 – Last modification : 27/05/21
MP573 Assembly guide – Main PCB, A side
31. Input transformer back PCB
Use the input transformer back PCB.
Insert the 90°, 13 pins headers, long tails first, into the holes, from the side marked NOT VISIBLE.
Solder one pin, adjust the position then solder the other pins. Only one pin out of two are soldered. Cut
the straight pins sharp.
32. Input transformer assembly
Remove the 2 screws from the transformer pin side and insert the
front PCB on top of the transformer, checking the pins number
correspondence and with the NOT VISIBLE text hidden. Assemble with
the 2 screws. Solder the transformer pins.
Place the back PCB on the other side of the transformer, with the
NOT VISIBLE text hidden. Assemble with the 2 provided screws.
Insert the transformer into the main PCB and solder the pins.
Warning
: The pins do not protrude much over the PCB so make sure
that you heat generously and see the solder flow into the holes.
33. Output transformer PCB
Place the 2x8 pins, 90° connector on the output transformer PCB,
on the side where it is drawn. Solder.
Cut the output transformer wires at
approximately 14 cm (5.5”). Strip out 5mm.
Insert, one at a time, the wires from the PCB
side with the colour identifiers, taking care of
matching the wire colour with the ID. Insert the
stripped end into the corresponding hole and
solder.
For a cleaner aspect, respect the wire parallelism from transformer to PCB.
YE=yellow, BK=black, OR=orange, BL=blue, GR=green, RD=red, VI=violet,
BR=brown.
34. Jumpers
Place one jumper on CN1 at the position marked by a white line.
Place one jumper on JMP3. This jumper will be removed after testing.
35. Visual check
At this point, brush the solder side with a hard tooth brush to remove any remaining solder bits.
Make a full visual check. Any missing component on the board ? Any remaining component in the box ?
When everything looks correct, proceed with the frame assembly.
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