Ramsey Electronics rrw1b manual Assembly of the RRW1B

ASSEMBLY OF THE RRW1B

Assembly of the unit is straight forward but it does require some time and patience. To get our bearings, we will start by mounting the power jack and move on from there. It serves as a good reference point for the other parts.

‰1. Install J22, the 2.1 mm power jack. Be sure to get a solid connection to all three pads as this will have to take some mechanical strain during nor- mal use. Use ample solder (without ‘globbing’ it on of course).

‰2. Install J20, the screw terminal connector. Make sure and install this so the mounting holes are facing the edge of the board. This is where you will be connecting your Infra-Red LED at the end of the assembly steps.

‰3. Install R23, a 100 ohm resistor (brown-black-brown).

‰4. Install Q21, a 2N3904 type transistor (marked 2N3904).

‰5. Install C23, a 10 uF electrolytic capacitor. Electrolytic capacitors are po- larity sensitive so you need to install them with the side of the cap that is marked minus (-) away from the plus (+) marked side indicated on the PC board silkscreen and the Parts Layout Diagram.

‰6. Install C24, a 0.1 uF ceramic capacitor (marked 104).

‰7. Install R25, a 1K ohm resistor (brown-black-red).

‰ 8. Install D20, a green LED. D20 is po-	A
larity sensitive so it only works in one	K

direction. The long leg of the LED indi-

cates the Anode (A) and the shorter is the Cathode (K). The Cathode is also indicated by the flat side of the LED if you look at it end-on. The silk- screen and Parts Layout Diagram show a flat side for easy positioning of the LED. Orient the LED so its flat side is the same as shown. Do NOT mount the LED flush to the board. Mount it as high as possible (about 1 1/4” off of the board). It will be bent over out of the front of a case later.

‰9. Install R27, the 220 ohm resistor (red-red-brown).

‰10. Install J21, the two pin jumper header. This header allows you to choose if you want smart data restore turned on or not during reconstitu- tion of the IR data. It is a tight fit so make sure the leads are through the board before soldering.

‰11. Install the 8-pin DIP Socket used to mount U21. It doesn’t matter which way the socket is oriented, as long as the IC chip is inserted cor- rectly in relation to the silkscreen on the circuit board. You can bend two of the corner leads out slightly to hold the socket in place when you flip the board over to solder it in. Be sure to solder all eight pins!

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