MFJ-8621 Data Radio
13
APPENDIX
Technical Assistance
If you have any problem with this unit first check the appropriate section of this manual.
If the manual does not reference your problem or your problem is not solved by
reading the manual, you may call
MFJ Technical Service at
601-323-0549
or the
MFJ
Factory at
601-323-5869
. You will be best helped if you have your unit, manual and
all information on your station handy so you can answer any questions the technicians
may ask.
You can also send questions by mail to MFJ Enterprises, INC., 300 Industrial Park
Road, Starkville, MS 39759; by FAX to
601-323-6551
; through Compuserve at
76206,1763; or by email to [email protected]. Send a complete
description of your problem, an explanation of exactly how you are using your unit, and
a complete description of your station.
Replacing the Fuse Link
The MFJ-8621 has a thin foil trace on the pc board that acts as a line fuse. This trace
connects power to the rest of the circuitry and may "burn out" under certain
conditions (such as when the MFJ-8621 is subjected to a reversed polarity power). If
your Data Radio does not operate and you suspect that the line fuse is broken follow
these steps:
1. Remove the cover and inspect the
fuse line. It may be necessary to
test the fuse for continuity.
2. If the line is broken replace it with a
length of #32 wire of approximately
the same length. You may optionally
replace the line with a heavier gauge
of wire and protect the unit with a 2
amp fast-blow fuse.
3. Replace the cover and screws.
DCD Setup
To use the
KPC-9612
at 9600 baud with the MFJ-8621:
1. Enter the command CD SOFTWARE at the cmd: prompt.
2. Set the 9600 receive level jumper (J9) to "ON" (both pins shorted together).
3. Set the 9600 equalization header for "variable" (pin 2 shorted to center).
4. Set the 9600 equalization pot (R33) from approx. 11 to 12 o' clock.
5. Set 9600 baud drive jumper (J7) to low range (jumper one pin only).
6. Set the 9600 baud drive control (R32) to midrange.
To use the
KPC-3
at 1200 baud with the MFJ-8621:
1. Enter the command CD SOFTWARE at the cmd: prompt.
2. Set the AFSK level jumper (J3) to "high range" (both pins shorted together).
3. Set the 1200 transmit drive level control (R13) to 3.5 KHz. transmit deviation as
described in your KPC-3 reference manual.
