[GreenKeys] Troubles with 33

[UEOGUY-H.E.ROBT]

Bill it's been awhile since I had my 33/101C, I'll see if I have any 
docs left on that.  But if memory serves me, the fist place to look is 
the SMD (selector magnet driver) card, located in the UCC area, it's 
usually the "burnt" looking one!  They were poorly designed and go 
regularly, usually too much heat from the current bypass resistor at the 
top of the card. I think both the 33's and 35's used them.  And looking 
at the only prints I can find, it's pretty much a closed loop in local 
mode, between the power supply the selector magnet and the keyboard, via 
the trans/dist.  The prints I have are from a 3320 with automatic modem, 
which is the newer version of the 101c, that through the miracle of 
miniaturization now only occupies the UCC area, nothing except the 
reader PS in the base!

If you like, I can try to scan the diagrams, that may be of help to you, 
but again they are not exact w/respect to your unit???

Bob

Bill Kotaska wrote:

>My 33 is the TWX type with a 101C data set (modem) in the stand. The CCU has
>a touch tone dialer and 6 lighted pushbuttons at the bottom. It appears the CCU wiring
>is mostly an extension of the data set wiring. There are two 50 pin connecters routing
>wires between the two.
>
>I am trying to track down the local mode current generator. I believe it originates in the
>data set. Anyone know if this is correct? I can't find any circuitry in my CCU which
>generates this. With the data set connected I get no local mode current so the selector 
>continously cycles. I can disconnect the data set and inject a current to get it to stop.
>
>Does anyone have a schematic for the 101C or the CCU in the teletype? There are some
>descriptions (text only) in the ASR manuals but not enough for troubleshooting. My
>only other option is to start trying to trace the wiring. Given the 7 circuit cards and
>numerous relays in the data set, this would be a very big job.
>
>Thanks,
>Bill
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