Assembly Steps - Ramsey Electronics UAM2 Quick Manual

UAM2 PC BOARD ASSEMBLY STEPS
Let's start with the surface mount components first, and do the big through
hole parts last, except for J3, which we will install as a reference part to get
our bearings. You want to be careful about how much heat you apply to the
teeny parts. Just get the tabs and circuit board pads hot enough to get the sol-
der to flow. We have also given you extra caps and resistors in case you torch
them. The one really tough surface mount part has been installed at the fac-
tory for you. Be very thankful. . . it's a bear to do yourself!! Orient the board so
that you can read the writing and let's get going.
1. Install J3, RCA jack, at the left side of the board.
2. Install R2 and R3, 120K resistors [marked 124], near J3. These are
pullups for J1 and J2, which are the gain setting jumpers.
3. Install C7, 1 uF surface mount capacitor, to the right of R2.
4. Install C5, 1 uF surface mount capacitor, to the right of R3.
5. Install C8, .47 uF surface mount capacitor, just below R7.
6. Install C9, 1 uF surface mount capacitor, above C5.
7. Install C6, 1 uF surface mount capacitor, next to C9.
8. Install C10, 220 pF surface mount capacitor, next to C6.
9. Install R4, 120K surface mount resistor, next to C10.
10. Install R5, 51 ohm surface mount resistor, above R4.
11. Install C12, .22 uF surface mount capacitor, to the right of R5.
12. Install L2, surface mount ferrite bead, next to C12. This acts a trap for
high frequencies at the speaker output, so the kit doesn't radiate lots of
RF and upset the FCC.
13. Install D4, Schottky diode, under L2. Make sure it goes in the right
way. The white band on the part should line up with the band on the board
drawing.
14. Install C14, .001 uF surface mount capacitor, next to D4.
15. Install C11, 1 uF surface mount capacitor, under D4.
16. Install D3, Schottky diode, under C11. Again, watch the polarity.
17. Install C15, .001 uF capacitor to the right of D3.
UAM2• 9