[Hallicrafters] SX-28A Help

[Al Parker]

Hi Jim,
    Your diagram doesn't make a lot of sense after line returns are made,
etc, but:
    the "blackish" wire is green, it's the so-called 100v line, which is
really about 145v, and it goes to the 2nd pin from the front (of the 4) on
the 2nd RF box.  Maybe that's no. 6 in your diagram?  You're right, it
does also go to that terminal stip.
    This makes a good case for making sketches before you take something
apart, with wire/terminal locations and color.  Those markers have a habit
of falling off of the wires.  Its' a bit late for you now, but maybe next
time?
73,
Al, W8UT
New Bern, NC
BoatAnchors appreciated here
http://www.thecompendium.net/radio/
http://www.hammarlund.info

----- Original Message ----- 
From: "jim" <jimw at premier1.net>
To: <hallicrafters at mailman.qth.net>
Sent: Friday, March 12, 2004 12:09 AM
Subject: [Hallicrafters] SX-28A Help


>
> This is a question for a SX-28A expert out there.
>
> Well, I've really done it now.  Elmer has struck.
>
> A wax cap was heating up in the RF Deck after the radio played for a
> while, so I went in and replaced the bad caps and resistors in the 1st,
> 2nd, and mixer boxes. Not fun.  I really didn't want to, but I didn't
> see an alternative.  I marked all the wires as I dis-assembled.
> .
> When I got to the point to hook up the wires connecting to the 4 pins on
> the top of each metal box I found the wire marker fell off a blackish
> wire.  It looks like it should connect to one of the 4  the mixer box
> pins, but I don't know which one.  It doesn't seem long enough to reach
> much of the other boxes but I suppose it's possible to get to some of
> the 2nd stage.
>
> The "mystery wire" is blackish color, and I think it goes to a terminal
> strip connector.  A 1K resistor goes from that terminal strip connector
> to the 6L7 pin 4.  I think it should connect to 1 of the 4 pins on top
> of the metal mixer box but I can't figure out which one.
>
> Does anyone have a diagram of the wire connections to these boxes?
>
>
> As SX-28A is on side with IF cans on top, from bottom of chassis the
> view looks like this:  (Oscillator box not shown)
>
> <==Front                                                Rear   ====>
>
>   1    2    3   4                5       6        7       8
> 9   10    11   12
>   |    |    |   |                      |       |        |
> |              |      |       |      |
> |--------------------|      |---------------------|
> |--------------------|
> |   Mixer Box           |      |  2nd                        |     |
> 1st                       |
> |                              |      |
> |     |                             |
> |                              |      |
> |     |                             |
> |                              |      |
> |     |                             |
> ---------------------      -----------------------    ------------------
---
>
>
>
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> List Administrator: Duane Fischer, W8DBF **for assistance**
> dfischer at usol.com
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