[cctalk] Re: TK50/70 Repair

Looking at my notes I found a similar situation: Tape would not load properly. Turned the rear nut 1/2 turn in, and it loaded. Then it would not read, turning the front nut down 1/2 turn allowed it to do proper reads and restores from an already-written tape. I think there is an oscilliscope method of setting the capstain height out there somewhere, but this "barn door" method works for me as well. C On 2/13/2023 9:31 PM, Chris Zach via cctalk wrote: > No I don't. I just lubricate them. Odd though, did you turn the nut > down the same number of turns and is the capstain dragging on the tape? > > C > > On 2/13/2023 8:05 PM, Nigel Johnson Ham via cctalk wrote: >> Chris, I don't suppose you have the part number for suitable >> replacement bearings, do you? I have cleaned out the sensor wheel >> but still the same problem - but when i give the idler wheel a >> little push it at least goes to ready. >> >> cheers, >> >> Nigel >> >> >> On 2023-02-08 10:49, Chris Zach via cctalk wrote: >>> I think it's metal, but using a bit of good old soapy water and a >>> rinse/dry should be fine. Remember that there is a little window >>> screen part there to ensure the optical system only sees the slit >>> right under it, don't forget to install it as well. >>> >>> Glad to hear there is progress. Let us know how it works out! >>> >>> C >>> >>> On 2/8/2023 10:06 AM, Nigel Johnson Ham via cctalk wrote: >>>> Well, I found dust and what looks like oil on the optical wheel.  >>>> It looks like somebody may have tried to lube the bearings in situ >>>> and used too much oil :-( >>>> >>>> I'm amused to see that it uses the same moiré principle that was >>>> used way back in the RK05! >>>> >>>> Do you know if the pattern on the wheel is purely cut out, or is >>>> there any photographic film involved?  I think the only possible >>>> solution would be to clean it with isopropyl, but useless to do >>>> that if it is film. >>