[GreenKeys] More TU-170 questions

[John Hargett]

Well , in reality, a question about the TU-170A ( no loop supply).   New

  To start with, *_new_* to all this TTY, but love the old machines.  
Picked up 2 machines from Paul well pre -covid, and finally getting 
around to trying to get them fired up.  I have several TU,  ( 2 - 
TU-170A, an IRL FSK-1000, a CV-483C  and will have a Dovetron MPC-1000T  
II ( not here yet)  The TU-170a's all power up, and I can get them 
receiving on ITTY, also get the FSK-1000 to receive on ITTY, have not 
yet tried the CV and waiting to see what shape the Dovetron is in.


My question is about the TU-170a's.  The loop supply shows to connect to 
the P2 connector on the back panel.  There is no info in the manual , 
other than the schematic,  for P2.

pin 1=   DMOUT-TTL

pin 2=    +12V

pin 3 =    AFSKIN-TTL

pin 4=    GROUND


Dont want to do any damage to the TU-170a's , so looking to the 
knowledge of the Greenkeyers.


Looking forward to getting on the air and joining in a QSO

Thanks in advance,

John

KG5YLG




On the FSk 1000, is there any alignment information out there. Unit was 
kind of dirty when I got it, and when first hooked up to ITTY, was 
getting even meter movements for mark and space, but now the mark meter 
is about half reading of the space.

On 12/27/2020 9:32 PM, w9ddd at tapr.org wrote:
> Yes I took a short cut and didn't think about there being 2 fuses, especially if the parts list only shows one. Perhaps it's a case of the parts list only showing what's on the PCB.
>
> I'm thinking a 1 or 2 page addendum to the manual would be nice.  We could take the cleanest copy available and have someone  who can edit a PDF insert  the addendum.
>
> If I were bored with nothing else to do, I'd do a new schematic that combines all in one drawing.  Don't hold your breath.
>
> John, W9DDD
>
>
>> On Dec 27, 2020, at 9:55 AM, Ralph Mowery <rmowery42 at charter.net> wrote:
>>
>> John take a closer look at the schematic.  The .125 fuse is only in the DC
>> loop supply side that is normally set for 60 ma max or 20 ma.  It seems to
>> be one of the fuses that resembles a resistor and is wired in the circuit
>> board.
>>
>>
>> There is a much larger fuse that is in the AC line.  Looks like one of the
>> 3AG type that is more common to most people.  It is not shown on the
>> component schematic, but on the chassis wiring .  I did not see a rating for
>> that one, but it should be high enough for the tu170 and the teletype motor
>> circuits.
>>
>> Ralph ku4pt
>>
>>
>>
>> -----Original Message-----
>> From: greenkeys-bounces at mailman.qth.net
>> [mailto:greenkeys-bounces at mailman.qth.net] On Behalf Of w9ddd at tapr.org
>> Sent: Sunday, December 27, 2020 2:30 PM
>> To: greenkeys at mailman.qth.net
>> Subject: [GreenKeys] More TU-170 questions
>>
>> The SSR questions got me to looking in the manual again.
>> No specs on the motor control SSR.
>> They list the fuse as 1/8 amp.  Tracing the circuit diagram shows that the
>> switched outlet is fed through that fuse.  I don't think that would work.
>> Either the  drawing is in error or the fuse size must be wrong.
>>
>> When I return home I'm going to have to take the cover off to replace the
>> meter lamp so I may as well investigate then unless some already has the
>> answers.
>>
>> John, W9DDD
>>
>>
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