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

[John, W9DDD]

The paperwork is letter size and folded in half fits snugly in the 
envelope.  It would be easy to miss if not looking for it.

I can't send you anything at the moment because I'm out the door for an 
appointment.

John, W9DDD

On 4/25/2019 1:27 PM, John, W9DDD wrote:
> 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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