Manualshelf

Instruction manual

ManualsBrandsRamsey Electronics ManualsHeadphoneSHA2
12345678910
BD416 • 12
ASSEMBLY STEPS
We’ll start with the low profile components and work our way to the tallest.
That will make it easier to install and solder the components. Locate the 5
IC’s, (2x74HC74, 1x74HC154,1x74HC154 1x74HC86). These IC’s may have
letters before and/or after the type depending on the supplier. Be assured
they are the correct part if they have the stated number in the labeling. Notice
that the marking on the board for these IC’s has a small half circle on one end
and that the IC’s have the same type of marking or a small indented dot on
one end. It is important that the IC be installed so it matches the marking on
the board. It may be necessary to gently bend the leads inward on each side
of the IC’s so they are at right angles with the plastic body in order to get them
into the holes in the board. This is easily done by holding the IC so the leads
on one side are flat against a flat surface and then pressing the body so the
leads bend slightly inward. Do this for the leads on both sides of the IC.
Make sure that all the leads go thru the board. When you install the IC it is a
good idea to insert it into the board and slightly bend one lead on opposite
corners on the bottom of the board so it will stay in place. Then make sure all
leads are thru and it is properly oriented before soldering all the leads.
1. Install U1, a 74HC74
2. Install U2 a 74HC74.
3. Install U3, a 74HC154.
4. Install U4, a 74HC157.
5. Install U5, a 74HC86.
Next locate the 4, 10K ohm resistors.
6. Install 10K ohm resistor R1 [brown, black, orange].
7. Install 10K ohm resistor R2 [brown, black, orange].
8. Install 10K ohm resistor R3 [brown, black, orange].
9. Install 10K ohm resistor R4 [brown, black, orange].
Now find the 4 screw terminal connectors, (2, 2position and 2, 3 position).
10. Install J1 a 3 position connector.
11. Install J2 a 3 position connector.
12. Install J3 a 2 position connector.
13. Install J6 a 2 position connector.
Locate the 10 pin dual row and 20 pin dual row connectors, (one of each)
14. Install J5 a 10 pin dual row connector.
15. Install J4 a 20 pin dual row connector.