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Document revision 2.3 – Last modification : 27/05/21
MP573 Assembly guide – DI board
42. Diodes
Add D11 and D12. These diodes are placed vertically. Bend the cathode leg
(identified by the black ring).
Warning
: Make sure to respect the direction of the diodes which is marked by a
ring on the component and a 'K' on the PCB marking.
43. Film capacitor
Add C34.
44. Transistors
Add Q7 and Q8.
The PCB has provision for two pinouts for Q8. With the current 2SK170, use the A position.
Warning
: Watch out the transistor direction.
45. Electrolytic capacitors
Add C35, C36, C37.
Solder one lead first, adjust verticality then solder the second lead.
Warning
: The +lead must go into the +hole. Do not reverse!
46. Jack connector
Add CN4. The position of the socket is important for a good front-plate matching. It must sit flat
on the PCB. Press firmly the socket on the PCB and solder one of the pins. Check position then solder
the other pins.
47. 6 pins Connector
Solder the connector CN3b. Solder one pin first, check verticality, then solder the other pins.
Warning
: the connector pins must be exactly perpendicular to the PCB to allow proper insertion into the
preamp board.
48. Visual check
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 ?
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