[GreenKeys] ASR-33 Chattering...and the beginning of an adventure!

[JOHN]

I figured as much! The 60ma side shows 2k. The 20ma side is open across everything.

Q: is there a way to provide loop back using line select switch and a appropriate power supply...just to continue troubleshooting?

Thank you again!

John

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------ Original Message ------

From: WAYNE
To: John Kelley, GREENKEYS BULLETIN BOARD
Sent: September 1, 2019 at 1:37 PM
Subject: Re: [GreenKeys] ASR-33 Chattering...and the beginning of an adventure!

John,

Of course I meant ohm out the large green resistor, not the transistor.

Wayne

> On September 1, 2019 at 1:23 PM WAYNE <teletypeparts at comcast.net> wrote:
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> John,
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> We now know the problem is in the Local loop supply. You could make up a test Molex like the second and third pic and try the 9 volt batt test and see if you can type a couple of letters. Dont leave the 9 volt batt on too long. The first 9 volt batt test you performed only checked the Receive side of the Line mode. The test in the pic will check the Send as well.
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> With the machine working in the 9 volt temp test in Line mode you have tested the SMD card and the power transistor. Ohm it out and see if there is an open on one of the slide on connectors. See pic.
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> The problem is likely the large green resistor just in front of the power transistor.
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> I am afraid I have none on hand. If you find a source please let me know where you found it.
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> Its also possible the capacitor in front of the large green resistor is bad but unlikely.
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> Sorry for the jumbled way you are getting this email. Its my thinking process. LOL.
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> Wayne
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