[GreenKeys] ASR33 tape reader

[Don Robert House]

If the shipping screw has been removed you can lift the typing unit 
up off of its rubber supports.  The screw, or empty Tinerman nut, is 
visible underneath the codebars when looking straight down with the 
flip cover open.

  You mentioned lubrication earlier.  It is very tricky to lube a 
reader.  The only lube I use is grease on the springs.  The contacts 
need to be clean "as a whistle" and the surface of the magnet and 
armature should also be clean.

Another thing to check is to make sure the Molex plug is firmly 
seated in the reader power supply in the base of the machine.  You 
should also check the position of the distributor rotor and make sure 
the face of the distributor is nice and clean as well as the two 
brushes.  The machine screw that holds the rotor needs to be snug.

Good luck,
Don




>On Wed, 9 Apr 2003 15:48:29 -0500, you wrote:
>
>>First make sure the shipping bolt is removed from the bottom of the 
>>base "pan"
>
>Nothing obstructing the movement of the parts that I can see.
>
>>Bouncing contacts cause all kinds of trouble with 33 readers.  The
>>answerback drum in the rear of the machine and the keyboard contacts,
>>controlled my the H lever, are both in parallel with the reader
>>contacts.
>
>I have removed the answerback drum and its associated contacts, so
>that's ruled out. Keyboard could be causing errors - I believe I
>can pull one of the Molex connectors from the p/s and disconnect
>it.
>
>>Get out the adjustment manual and check the adjustment of the reader
>>feed pawl.
>
>Have done so. Problem is, when it has the recommended amount of
>clearance above the tooth, it won't work at all (blocking pawl is
>too far away and the sprocket rotates in the wrong direction. If I
>play with both adjustments enough I can get it to work 99% as
>described.
>
>>   If you need a M33 manual you can get one from Tom
>>Kleinschmidt at <tomkleinschmidt@attbi.com>
>
>Found it online, thanks, and have a printed copy on the way from
>"Print to Kinko's" online!
>
>>Lots of patience is required when working on M33 ASRs.
>>
>>Don
>
>Think I've used mine up for the moment :)
>Thanks for the info.
>
>I also have found that none of the function levers in slots 10,11
>or 12 (that among other things, actuate the XON and XOFF aka DC1
>and DC3 contacts for automatic reader control) are moving their
>associated function pawls when any of the 255 possible 8-bit
>combinations are sent to the typing unit. The CR, LF, SP, BEL all
>work fine. I have read up on the Right Rocker Drive and a couple
>of other adjustments and will start pulling out hairs on that
>problem next!
>
>-Charles