diode in position and briefly touch the tip of your soldering iron to the pad at C2,
melting the solder and securing one end of the diode at that point.
F) In a similar manner, secure the other end of the diode to the solder pad at D3. Note
that you may have to add a small amount of solder to this joint in order to properly
attach the new diode.
G) After both ends of the new diode are soldered into place, it is a good idea to go
back quickly and reheat both joints, one at a time, to ensure a good connection.
Reassembling the Keyer:
12) Reinstall the SPEED control into its mounting hole in the front panel and
loosely
install
its mounting hardware.
13) Reinstall the pushbutton PC board, and
loosely
install its two mounting screws.
Ensure that you have not accidentally captured any of the pushbutton wires between the
PC board and their standoffs.
14) Slip the white nylon standoffs over the two screws onto which the keyer PC board is
mounted. Place the keyer PC board over the screws and secure with two 4-40 split
washers and nuts.
15) Using a voltmeter, measure the voltage of each of the AAA cells. If any one cell
measures less than 1.4 volts, replace them all now.
16) Reinstall any of the 3 AAA batteries you removed during disassembly.
17) Replace the top cover onto the keyer and
temporarily
secure with
two
(2) 4-40 screws.
18) Check for proper alignment of the pushbuttons through the holes in the top cover and
make any adjustments to the position of the pushbutton PC board at this time.
19) Complete the installation of the top cover of the keyer.
With the modification in place, the voltage regulator can no longer draw current from the
battery pack. Whenever the keyer is not in use the CPU automatically goes into sleep mode,
and battery drain drops to the microamp level. The batteries will last for a very long time as the
primary power source for the keyer.
If you require a diode for this fix, e-mail, write, or call us and we will be happy to immediately
mail a diode to you at no charge.
We apologize for this inconvenience.
73
Idiom Press
