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A. If the HD-1410 is to be used exclusively with the Ten-Tec or rigs with similar requirements, R27 and D5 can be replaced with jumper wires. This disables Q7 and eliminates the .7 volt drop due to D5.

B. If the HD-1410 is to be used both with such rigs and cathode or grid block keyed rigs, the modification shown on the attached schematic may be made. The jack labelled "Ext. Key" becomes a secondary "keyer-out" jack for use only with rigs employing a positive key line, and solid state keying circuit.

1. Refer to page 40 of assembly manual and remove the wire between jack L, lug 1 [Keyout Jack] and circuit board hole F.

2. Disconnect the remaining wire from jack L, lug 1 and connect to circuit board hole F.

3.

Mount

terminal

strip

and

components

as

shown:

[[Shows TS down slightly.

431-62 To Connect

be a

mounted under top 4700 Ohm resistor

screw of Jack L and bent between lugs 1 and 3 of TS

431-62. one lug

Connect base of Jack L and

of [PN 417-801] to lug 1 of TS 431-62; emitter the collector to the other Jack L lug]]

to

4. on

Connect wire from Lug

circuit

board.

Solder

3 of this

Terminal Strip to junction wire to lead of R26.

of

R23

and

R26

Keyer Keys Continuously Or Erratically

Problems with RF causing the keyer to key continuously or erratically, particularly when using long wire or random length antenna systems, can be eliminated by connecting a .001 uF disc ceramic across the keyer output jack.

Intermittent Sidetone

HD-1410

May 20, 1975

Bulletin No:

Electronic Keyer

Service Guide

HD-1410-2

In some units, if the "tone" control is turned fully clockwise [low frequency end], the sidetone will be intermittent. Turning the pot slightly counterclockwise will eliminate the condition. ------------------------------------------------------------------------

The following is a step by step procedure for servicing the HD-1410 Keyer:

Equipment Needed:

1 VTVM [Not a VOM or DVM]

Set controls on HD-1410 as follows:

AC Switch - ON Speed - Full CCW Volume - 1/4 CW

Set VTVM as follows:

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