Heathkit Service Bulletins -HD-3030 (Revised & Complete)

[Joseph W Lutz]

                        October 29, 1984
HD-3030                                         Bulletin No:
RTTY Terminal Interface                         HD-3030-1

                Schematic Corrections - U3C & AFSK Board

On the schematics for manual [PN 595-3100] and the HD-3030 Blue Book
schematics, make the following corrections:

        On the main circuit board schematic, add an inversion symbol
        at pin 14 of U3C.

        On main circuit board schematic, lower left, change 12 V at U1-9
        and U3-9 to read NC.

        On AFSK circuit board schematic, remove the connections between
        board connector pin 2 and pins 3, 6, 8 and 10.
---------------------------------------------------------------------------------------------------------------
                        November 30, 1984
HD-3030                                         Bulletin No:
RTTY Terminal Interface                         HD-3030-2

                Repetitive Failure Of CR6, Q10 and Q12

In Terminal Interface units set for current loop operation, the
repetitive failure of CR6 [PN 56-16], Q10 [PN 417-936] and Q12 [PN
417-988] can be prevented by installing a normally-closed phone jack [PN
436-4] at S2 and a 110 volt zener diode [PN 56-48] across the loop
output.

Make this change only when needed.
--------------------------------------------------------------------------------------------------------------------
                        January 31, 1985
HD-3030                                         Bulletin No:
RTTY Terminal Interface                         HD-3030-3

                      H/Z To HD-3030 Interconnection

Some customers who did not purchase the options for the HD-3030 may ask
for information for connecting the H/Z-89 Computer to the HD-3030.  Here
is the interconnect diagram from the HDP-1010 Super CW software manual
for your reference:

                                            DTE PORT

                                                 3300

                                       H8       OR     H89

                                       -----                -------
        Ground        1   -----------    1    -------
                                    |
                                    x  Grnd          HD-3030
                                              [SOUT]
    Rtty Data out             3  ---------->    2
----------------------->[Pin 6]  AFSK IN
                                              [SIN]
    Rtty Data In                5  <---------     3
<-----------------------[Pin 4] RS-232 DM OUT
                                              [RTS]
            PTT                      7  ---------->    4
----------------------->[Pin 25] RS-232 Send-P
                                              [DSR]
        CW Data In           11 <----------    6
<-----------------------[Pin 3] T(Squared)L DM OUT
                                              [GND]
                                        13  -----------    7

        CW Data Out        14  ----------> 20
----------------------->[Pin 2] Key-N
                                          |                     |
                                   [15 Pins]     [25 Pins]


[From Transceiver to HD-3030]

                                         RX AUDIO [SPKR
OUT]--------------[Pin 13] AFSK Audio Out

               CW/PTT [KEY/CONTROL]------------------------------[Pin 10]
XMIT-P
                (Note: Both CW/PTT lines have 1N4001 Diode in-line)

                                         TX AUDIO [MIKE
IN]------------------[Pin 12] AFSK Audio In


                          [Pin 15] TO GROUND

((Hope the above is understandable.  When I have the scanner hooked up I
will forward the above to the Heathkit Web Page))
-----------------------------------------------------------------------------------------------------------------
                        January 31, 1985
HD-3030                                         Bulletin No:
RTTY Terminal Interface                         HD-3030-4

        Unit Outputs Data To CRT When 425 Hz Or 850 Hz Pushbutton
        Pressed During Reception Of 170 Hz Shift Signals

This is normal operation.  A voltage drop across D1 on a filter board
allows a very small amount of signal to reach the demod board.  Because
the demod board is sensitive, it amplifies the small signal enough to be
displayed on the CRT.

In most cases, the signals from the selected filter boards will over-ride
the residual signal from the unused filter board.
-------------------------------------------------------------------------------------------------------------------
                        Mary 31, 1985
HD-3030                                         Bulletin No:
RTTY Terminal Interface                         HD-3030-5

When the [PN 56-48] zener diode is installed according TEB HD-3030-2 in
the 1984 TEB Book, the loop output won't function reliably when used as
an input.  To correct this problem, remove the #56-48 zener diode.  When
the shorting jack [PN 436-4] is installed and the criteria outlined in
the "Caution" box on page 62 of the manual [PN 595-3100-2] is met, the
zener diode is not needed.

Mark the change on TEB HD-3030-2 for future reference.
-------------------------------------------------------------------------------------------------------------------
Thats everything I hold up to 1989 that covers the HD-3030.  Enjoy!
-------------------------------------------------------------------------------------------------------------------


73 de Joe  W7LPF/4  [NNN0KUU]
QWCA - SOWP - NCVA - FISTS - RCC
Gordonsville, Va 22942 [Orange Co]

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