[cctalk] Re: TK50/70 Repair

I'm finding 5.5 to 6 turns is a pretty solid constant. Try going down that much on each one, then going 1/2 turn in, 1/2 out, and down in 1/2 increments. C On 2/14/2023 10:35 AM, Nigel Johnson Ham via cctalk wrote: > Unfortunately, I had already removed the nut before you warned me > about that in a previous email. However I did try various adjustments > of that nut with disappointing results.  Maybe I will try doing it > many different settings!  I did compare it to the position of the hut > in a TK50 and it was about the same. > I can feel a definite rubbing in the idler, but I will keep trying. I > can visualise that the sensor slots must be the correct height to > give a good since wave. > > thanks > Nigel > > > On 2023-02-14 09:58, Chris Zach via cctalk wrote: >> 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. >>>> >