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PARTS LIST AND ASSEMBLY OF ENCODER BOARD
ITEMS PER BOARD-----------------------------------------------------------------------SOCKETS & HOLDERSALL IC SOCKETS MUST HAVE PINS 0.33" (8.38mm) LONGAugat 300C Series (dual wipe) Recommended 3 - 20 pin IC sockets 1 - 28 pin IC socket
1 - 40 pin IC socket
1 - 8 pin IC socket
1 - 16 pin IC socket
2 - 14 pin IC sockets
1 - 2 X 22 Card Edge Connector with 0.125 Contact Centers to Center
1 - DS-90980 (touch memory holder)
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IC's
1 - 80C31 MPU
1 - 74HC02
1 - 74HC14
1 - LS-7084
1 - MAX-232 or equiv.
3 - 74HC573's
1 - 27C256 (programmed)
1 - DS-1992L-F5 (touch memory)
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RESISTORS
3 - 10K 1/8W R3, R4, & R5
1 - 10Meg 1/8W R1
1 - 5.6K 1/8W R2
1 - 4.7K 1/8W R6
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CAPICATORS
1 - 0.10 Poly/25VDC C5
2 - 10uF Tant, or Electro/16VDC C12, & C11
4 - 1.0uF Tant, or Electro/16VDC C1, C2, C3, & C4.
2 - 0.001uF Cer/25VDC C6 & C7
7 - 0.10 Cer/25VDC All remaining capacitor locations
SWITCHES
4 - Jameco Electronics # 119010 Manufactures # KTIIBICM
XTAL
11.0495Mhz Series Resonance
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TOOLS & MATERIALS
1/ Acquire a 25 watt soldering pencil with a SHARP CURVED needle nose tip
2/ Obtain a supply of 0.75mm dia. Rosin Core Solder
3/ Obtain a quantity of solder flux remover
4/ Obtain approx. 1 foot of #33AWG wirewrap wire
Fully familiarize yourself with the board layout on both component side
(silk-screened side), and solder side.
BOARD ASSEMBLY
1/
Start the assembly with IC Socket installation. Because the board does not have plated through connections it is necessary to raise the socket approx. 1mm from the board.
2/
Start by soldering in the EPROM socket (28 pin). Solder ONLY, but all the connections on the component side that have traces attached. Then turn the board over and solder only those pins that have traces attached on the solder side.
3/
Proceed to the 40 pin MPU socket and install in the same manner used above.
Work your way along installing all the IC Sockets as above.
4/
Install all the components, resistors, switches, capacitors in a like manner taking care that both the solder side and component side is soldered as necessary.
5/
Between the 40 pin MPU and the 28 pin EPROM sockets there are 8 J? locations.
Cut 8 pieces of "wire wrap" wire and install a jumper between J1 at one socket and J1 of the other socket. Continue this jumper installation for J2, J3, J4, J5, J6, J7, and J8.
Be very sure the jumpers are installed to the correct locations.
6/
At the location of the "touch memory" holder solder a small piece of wire end through the center pad location that carries the trace through to the solder side of the board.
7/
When finished very carefully inspect all soldering for trace wicking, i.e. NO solder between traces and that all connections are secured.
9/
Before installing any IC’s apply the VCC +5VDC and ensure that the VCC is available at the required IC pin locations, AND NO other locations.
10/
Do a point to point continuity check on all the DATA line from socket to socket, from the top of the sockets. At the same time check between each adjoining DATA line that there is not contact between DATA lines.
This should complete all component installation and the IC’s can now be installed and the system checked out as per the calibration procedure.
If you notice any errors, or missing steps in this assembly procedure please contact me by:
E-mail: ve1alq@nbnet.nb.ca
Phone: 1 506 738 2734
FAX: 1 506 738 8512
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