14 Feb
2023
14 Feb
'23
4:02 p.m.
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.
>>