Ramsey Electronics HR40 Bedienerhandbuch PDF herunterladen (Seite 11)

FHT-1 • 11

black-orange).

 17. Install R21, 1K ohm (brown-black-red).

 18. Install C39, .01uF disc cap (marked .01 or 103 or 10nF).

 19. Next we’ll install switch S2 (the run - program switch for the

microprocessor). Gently slide the six solder pins through the PC board

for connection. Solder all six connections. Use enough heat to “flow” the

connections, especially on the ground “plane” connections.

 20. Install C45, 10 uF electrolytic. Be sure to observe the correct polarity.

See the parts placement diagram for correct orientation.

 21. Install JMP7, jumper wire. Use a piece of wire clipped from a

previously installed component bent into a small "U" or wire staple

shape. Jumpers act as electronic "bridges" carrying signals over PC

board traces underneath.

 22. Install another wire jumper, JMP3.

 23. Install resistor R23, a 10K ohm (marked brown-black-orange). Note

that this is a “stand up” component, so follow the parts placement

diagram.

 24. Install R20, 470 ohm (yellow-violet-brown).

 25. Install C36, 0.1 uF disc cap (marked .1 or 104).

 26. Form and install jumper JMP1. This completes the audio path from

the microcontroller IC to the FM transmitter section of the unit. If you

have purchased the voice ID option, the accompanying FHID-1 manual

will direct you in the proper steps to take concerning JMP1 and

associated components.

 27. Now that your soldering skills have been warmed up, we’ll install the

16 pin IC socket in the U2 position. We provide this socket because

many people feel it is easier to install a socket than to risk damaging the

IC chip while installing it. However, please be aware that we have seen

more service problems with improper socket insertion than from

soldering in ICs. Make sure that the IC socket is perfectly flat against the

PC board before soldering, and pay extra attention to not “bridge” or

splash solder between pads or traces while installing this socket. Do not

install the microcontroller yet, we’ll do that while we’re testing!

 28. Next, install resistors R43,R44, R45, and R46 which are all 10K ohm

(brown-black-orange). These are “pull down” resistors, that is, they “pull”

the corresponding pins of U2 to ground potential unless one of the

switches contained in S3 is turned on. These resistors insure a good

logic zero or one condition for the microcontroller.

 29. Install the DIP switch, S3. This “switch” looks like an eight pin IC - it

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Ramsey Electronics HR40 Bedienerhandbuch Seite 11