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2016a.1
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1990-09-02
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2016A.1
PARTS: 2 small diodes, not at all critical; 1N1004s are fine
1 small junk-box capacitor, .01 to .1, maybe tant or
electrolytic
abt 6" of hookup wire
PROC: -Cut the wire that goes from P24 on the main board to P9 on the
synthesizer board and install a diode in the wire, with the
cathode towards the synthesizer.
-Connect the cathode lead of the second diode to the cathode of
the first.
-Connect the anode lead of the second diode, via the hookup
wire, to P39 on the main board. (You can tap into the
white/orange wire that goes from P39 to the display board. You
guessed it -- this is the lead that drives the XMT LED.)
-To the same junction, connect the + lead of the cap; connect
the - lead to a good ground on the synth board. Your choice of
grounds, but the emitter of Q12 is OK, as is almost any other
reasonable shield, metal, or board screw. (If you couldn't
find a ground, would you be a ham?)
-Of course, all the standard good techniques (power off, good
insulation, appropriate soldering iron and temperature, etc.)
should be used.
Another mod that suggests itself on this radio is the replacement of
toggle switch SW6 (the red-handled WRITE switch) with a momentary.
If anyone has any questions about this proc -- or needs a copy of
2016A schematics -- contact me thus:
Allen, N2AEL@NO3M.#WPA.PA.NA.USA.
73 ES GL.