Troubleshooting Guide - Ramsey Electronics FX-440 Manual

FX- TROUBLESHOOTING GUIDE
The FX- transceiver is designed to W-0-R-K with a minimum of
adjustment or alignment. By imprinting the location and correct
orientation of each component on the PC board itself in addition to
publishing detailed assembly steps, we have virtually guaranteed the
successful operation of your transceiver from the moment you turn on thf
switch.
A detailed guide to servicing a transceiver requiring so few internal
adjustments is virtually pointless to compile. (It would be like writing a
troubleshooting guide to a jigsaw puzzle: "Make sure all puzzle parts are
in the right place, and it will be a nice, complete puzzle. That's it!")
The best assurance of trouble-free operation is to build, understand and
test your transceiver in the stage-by-stage sequence presented in this
book. If you chose to install all parts first and then test, and then
encountered difficulty, we recommend that you compare
rour
assembly
work to the stage-by-stage steps: USE the double-check ) [ ] spaces.
We simply MUST accept any malfunction to be caused by:
• incorrect part selection
• incorrect part orientation (diode or capacitor
polarity, transistors, IC's etc.)
• soldering error (missing connection, solder bridge)
omitted part
• part damaged during assembly
• part defective in manufacturing (extremely rare)
• part damaged by incorrect installation of other part(s)
• part breakdown after extended operation
• defective external device or cable connected to the transceiver
circuit board.
The above possibilities may seem vague, but they cover what can go
wrong in any multi-stage electronic device. For this reason, it is important
for you to LEARN the FX circuit design in as much detail as possible,
which is why both the schematic and assembly instructions are presented
stage by stage.
Trouble-shooting is a process that considers EVERYTHING possible,
ESPECIALLY including every external device connected to the unit:
• power supply
• ALL cables and connectors
• microphone, speaker
• antenna AND
• ALL cables and connectors!
If you are at all hazy about the binary programming of the • N" number,
despite the detail of our explanations, be sure you set one channel up for
446.000 Simplex before you pursue trouble-shooting. It is very important
to have a clear understanding of how to program the frequency
synthesizer and offset matrixes of your transceiver.
Ref. 46
FX-440