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Wrong Type Of Round Knob

Some kits were shipped with round knobs [PN 462-932] that will not accept the knob bushing. Although these knobs will fit onto the control shafts, the knob pointer may not align properly. ------------------------------------------------------------------------

HD-1410

September 23, 1977

Electronic Keyer

Keyer Locks On Some Bands

Bulletin No:

HD-1410-7

RF interference hs been

primarily

40

meter.

To

causing correct

the keyer to lock this problem:

on

some

bands,

Remove:

C102 from across the line and,

Add:

A bypass capacitor, .005 uF, 1400 volt disc [PN 21-72] from each side of the AC line to chassis ground.

A simple method of installing these is to place solder lugs under the mounting hardware for the AC connector and solder the capacitors to them. ------------------------------------------------------------------------

July 24, 1978

HD-1410

Bulletin No:

Electronic Keyer

HD-1410-8

No Dashes; Tone And Dots Okay

Check for a possible foil bridge between pins 8 and 9 or between pin 8 and ground of the Dash Reset circuit, IC2 [PN 443-1]. The bridge is usually too small to see without a magnifier. The bridge usually can be removed by scraping the area around pins 8 and 9 with a knife or other similar object. ------------------------------------------------------------------------

May 8, 1980

HD-1410

Bulletin No:

Electronic Keyer

HD-1410-9

Sidetone Not Loud Enough

To increase the sidetone volume:

  • -

    Remove the wire between point G on the circuit and lug 1 of R102.

  • -

    Run a jumper wire [PN 344-51] from R102, lug 1 to the collector of Q8.

The easiest place to access this is the R28 lead closest to the center of the board.

This increases Q3's collector voltage from +5 volts to +12 volts, which will incease the power output.

Perform this modification only on an "as-needed" basis. ------------------------------------------------------------------------ Thats everything I show up to 1989 that covers the HD-1410. Enjoy! ------------------------------------------------------------------------

January 31, 1975

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