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Document revision 2.3 – Last modification : 27/05/21
MP573 Assembly guide – Main PCB, A side
23. Small electrolytic capacitors
Add C18, C27, C6, C8, C19, C29, C1.
Solder one lead first, adjust verticality then solder the second lead.
Warning
: The +lead must go into the +hole. Do not reverse (they may explode !)
24. Switches
Add SW1, SW2 and SW3. The position of the switches is critical for a good front-plate matching. They
must sit flat on the PCB. Press firmly the switch on the PCB and solder one of the front pins (housing).
Check verticality and horizontality. Then solder the other pins.
25. Potentiometer
Place the bracket on the potentiometer bush. Attach with lock washer and nut. Insert potentiometer and
bracket into the PCB holes. Solder the 2 central potentiometer pins, taking care that it sits perfectly flat
on the PCB. Double check that the potentiometer shaft is parallel to the PCB surface. Adjust if needed.
Once the position is correct, solder the other pins.
26. Rotary switch
If your kit contains the switch with adjustable stops, insert the supplied metal
stops into the holes that are circled in the picture. Then place the adhesive
sticker to lock them in place.
Warning
: Work carefully over a large tray because these metal stops are
incredibly easy to drop and lose!
Insert SW4. Make sure that the switch if sitting perfectly flat on the PCB.
Solder 2 opposite pins, check that the shaft is parallel to the PCB, then
solder the other pins.
Warning
: Double or triple check the switch position before committing to solder because it is impossible
to unsolder and pretty expensive to replace. The pads are small and take some care to solder.
27. Regulators
Add U1 and U2. Insert as far down as possible, solder one pin, adjust the verticality, then solder the
two other pins.
Warning
: Watch out the direction, the metal tab at the back of the device is symbolized by a double line
on the PCB marking.
28. Large electrolytics
Add C7, C10, C11, C12, C13, C23.
Solder one lead first, adjust verticality then solder the second lead.
Warning
: The +lead must go into the +hole. Do not reverse (they will explode !)
29. Power transistor Q6
Clip Q6 into its heatsink making sure it is well centred. The transistor must be
firmly pinched by the clip. If available a drop of thermal paste can be layered on
the back of the transistor.
Insert the 2 heatsink pins all the way down into the PCB holes. The transistor
pins are going through the slot. Solder the heatsink pins. Bend the 3 transistor
pins 90° in direction of the 3 rectangular pads underneath the PCB. Cut the
pins slightly shorter than the pads and solder.
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