[GreenKeys] 35 ASR current loop connections....

[John, W9DDD]

I don't remember how I found it, but for sure I book marked it.

John, W9DDD

On 4/25/2019 4:14 PM, Clay Archer wrote:
> Thanks!  It looks a lot closer to my machine.   I have been google-ing for
> several weeks and it never came up with that site.
> 
> -----Original Message-----
> From: greenkeys-bounces at mailman.qth.net
> [mailto:greenkeys-bounces at mailman.qth.net] On Behalf Of John, W9DDD
> Sent: Thursday, April 25, 2019 12:28 PM
> To: greenkeys at mailman.qth.net
> Subject: Re: [GreenKeys] 35 ASR current loop connections....
> 
> See if any of this helps
> 
> https://www.blunham.com/Misc/ASR35/
> 
> John, W9DDD
> 
> On 4/25/2019 1:03 AM, Clay Archer wrote:
>> My rebuild of my 35 ASR is going well.   I have just about everything
>> working in local mode.   Reads and punches tape and types correctly,
>> and can type and punch from the keyboard.   The rubber on the printing
>> reperf print hammer is missing, if anyone has a source please let me
>> know (p/n 173979).   I also need the paper tape spool holder,  I could
>> probably make something to do the job.
>>
>> I’m ready to try it “on line”, but I need to work out the current loop
>> connections.    It had some cut wires connected to the lower 4 screw
>> terminals on the back of the power supply section (I think the book
>> calls it the “electrical service unit”).  The upper 4 terminals are
>> numbered 1 to 4 and is where the power cord connects.    The bottom 4
>> are numbered 5 to 8.   Terminal 8 has no connection.     On my 33ASR I
>> have looped the input & output with a current limited voltage (a small
>> 6 or 9 volt battery usually works) so I thought I would give this a
>> try on the 35.   Connecting a battery to terminal 5 & 7 or 6 & 7 will
>> stop the chattering like it’s receiving a valid loop.   And it
>> sometimes prints random characters when I connect to these terminals.
> However, when I
>> type in line mode the data goes to the punch instead of the printer.
>> The selector knob is set correctly to the keyboard-to-print position
>> and it works in local.    Using a scope I can’t see any pulses when I
>> type on the keyboard on any of the screw terminals (I applied a small
>> voltage as a pull-up).  I also found that if I jumper 5 & 7 or 6 & 7
>> (without a
>> battery) it acts the same way.
>>
>> There are also 8 screw terminals on the back of the call control unit,
>> none seem to do anything.    Oddly, my call control unit consists of a
>> transformer and a relay.   The relay never seems to activate with any
>> knob setting or line/local.
>>
>> Does anyone have any manuals on the 35 ASR?    All that I can find
>> online are for the KSR & RO.    The schematic for the KSR & RO shows
>> it’s quite different from the ASR.
>>
>> Any assistance you can provide would be appreciated.
>>
>> Clay
>>
>>
>>
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