Assembly Instructions - Elenco Electronics AK-900 Assembly And Instruction Manual

ASSEMBLY INSTRUCTIONS

1. Take a look at each of the parts bags and compare to the Parts List. Be sure that nothing was damaged
during shipping and handling. Contact Elenco Electronics if you have any problems. DO NOT contact your
place of purchase as they will not be able to help you.
2. Lay the Circuit Board in front of you, circuit side (green side) up. Locate the Button Cushions and Piano
Cushions from Bag #1. Place them onto the Circuit Board one at a time in the arrangement shown in Figure
A. The pegs on the Cushions fit into the holes in the Circuit Board but will be loose; flip the Board over to the
components side and pull on each of the pegs (be careful not to bend the red LEDs on the circuit side while
doing so), see Figure B. The Cushions should now be flush on the Circuit Board.
Button Cushion
w/ 12 Contacts
Button Cushion
w/ 2 Contacts
Piano Cushion
w/ 12 Contacts
LEDs
3. Lay the Top Case upside-down in front of you. Locate the Switches (Bag #4), Switch Covers (Bag #4), Switch
Springs (Bag #3), and Switch Ball Bearings (Bag #3). Make sure the metal contacts are bent up 45
(otherwise they may not contact the circuit board), and that they are not damaged. Place a Spring into the
hole in the side of one of the Switches (as shown in Figure C). Place some Vaseline or grease into the ball
grooves in the switch slots on the inside of the Top Case (to ensure the Switch will switch smoothly) and a
drop on the Switch Spring. Place a Ball Bearing onto the Spring (the Vaseline helps hold the Bearing in place)
and carefully place the Switch into one of the switch slots, being sure not to drop the Bearing while doing so.
Next, press a Switch Cover into the Switch from the outside of the Top Case while holding the Switch in place
on the inside of the Case (as shown in Figure D). Be sure the Switch moves properly between each of the
switch settings and then install the other two Switches in the same manner.
Spring
Ball Bearing
Figure C
Green Side of
the PC Board
Piano Cushion
w/ 12 Contacts
Figure A
Switch
Piano Cushion
w/ 13 Contacts
Pegs
Figure B
Switches
-9-
Component Side
of the PC Board
Switch Covers
Figure D
O