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4. Tone oscillator circuit. IC1D.

Jumper will still be connected to pin 8 of

A. between . C6, tone

Touch meter probe to pin 4 of IC5D.

Nee

6 and 1.4VDC.

If

control.

Replace

proper IC-5.

results

are not

dle should oscillate obtained, check C5,

B.

Touch

between 4

.3 and

R21.

meter probe

If

Rep

4.7VDC.

lace Q3.

to [C] proper

of Q3. result

Meter n s are not

eedle should oscillate obtained, check C7,

5. Paddl the jumpe

e control and memory logic: r wire from pin 8 of IC1D.

Shut off the keyer and unsolder

Keyer Keys Continuously Or Erratical

ly

In the next run, a .005MFD [5000pF, PN 21-57] will Keyer output jack.

be added across the

This supercedes the information in Bulletin No: HD --------------------------------------------------

-1410-1 ----------------------

Bulletin No: HD-1410-4

A. IC-1, IC- released

Turn the keyer on and with the VTVM chec 2 and IC-3 as shown on the schematic. Wi the logic levels will be reversed.

B.

Memory bit problems can only be in IC-5,

----------------------------- May 20, 1975

March 26, 1976 HD-1410 Electronic Keyer

No Dots Or Dashes

k the logic levels for th both paddles

---------------------

HD-1410 Electronic Keyer

R3, R4, C1 and C2. ----------------------

Bulletin No: HD-1410-3

If the unit has no dots or dashes output, but has a tone in the "hold" mode, check the installation of Q2. The customer apparenly tries to twist the transistor so that the flat of the transistor will align with the flat screened on the board. This will cause the base & collector leads to short.

The manual is being changed to clarify the installation of this transistor. ------------------------------------------------------------------------

June 24, 1976

HD-1410

Bulletin No:

Electronic Keyer

HD-1410-5

RFI

RFI in the keyer coming through the power supply can be eliminated by

installing two .005UFD/1.6KV capacitors the ground.

[PN 21-44] across the AC line to

------------------------------------------------------------------------ July 9, 1976

HD-1410

Bulletin No:

Electronic Keyer

HD-1410-6

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