Ramsey Electronics FZ-146 Specifications download pdf (Page 68)

FX 146 • 68

VERY IMPORTANT PC BOARD ASSEMBLY INFORMATION FOR A-L-L

OUR BUILDERS!

1. Your FX- transceiver PC board is double-clad with plated- through holes.

What this means in practice is that it is VERY important to select and

install correct part values the FIRST time around. This type of board

makes "desoldering" much more difficult and risky because the solder

adheres inside the hole and flows to the component side of the board as

well. It is VERY tricky to remove a part without damaging it. If too much

de-soldering heat or component "pulling" is used, there is also the

serious risk of damaging small PC board traces. Be careful and

methodical in assembly!!!

2. Do not, under any circumstances, install L9, R32 or L10 until instructed

to do so in Assembly Stage "TX." This applies even if you are following

your own assembly sequences. This procedure will prevent damage to

Q9 and Q8 during the initial test and alignment procedure.

3. Do not attempt to "re-engineer" our transistor orientation illustrations.

Simply point flat sides or tabs as illustrated.

4. After installing all parts, you will see a few empty holes in the circuit

traces on the top or component side of the board. These plated-through

holes are placed intentionally to connect with traces on the solder side.

The hole IS the connection! However, if these holes nag at you, simply

fill them in with a touch of solder -- AFTER verifying that all parts have

been placed and installed correctly.

5. Additional "empty" holes are marked on the PC board to allow for easy

connection of accessories or modifications as you begin to customize

your transceiver. See "GUIDE TO FX- CIRCUIT ACCESS POINTS."

6. The purpose of check boxes “” in the assembly steps is to make it

easy to check the accuracy of your work at the end of each step.

7. Almost all resistors are mounted in vertical (upright) position. You can

see that the wire leads for resistors come in several styles. If a resistor's

pre-trimmed lead is ever too short for upright installation, simply solder a

scrap wire nipped from another resistor to extend its length.

8. Some of the resistors and miniature inductors used in this project require

upright or vertical installation. It is important to follow the orientation

illustrated for vertically installed parts. Always put the body of the part in

the hole with the circle!

9. Whenever you have a choice, install parts with stamped markings so

that you can still see the markings later. This will help greatly with any

possible troubleshooting needed.

10. PARTS SORTING: In a kit of this size and complexity, there is no single

best way to sort and organize the 300+ individual components used. We

1 2 ... 63 64 65 66 67 68 69 70 71 72 73 ... 144 145

No comments

Ramsey Electronics FZ-146 Specifications Page 68