Dual 1229 Tonearm Adjustment

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ebcdic
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Dual 1229 Tonearm Adjustment

Post by ebcdic » 10 Oct 2016 22:10

Hello. I am having an issue with a 1229 skipping about half way through a record. Note the table was cleaned and the rubber ring washer replaced. One other change was I replaced the dearing ring with a good one from another tonearm (I replaced the whole segment). Even dialing up the tracking force with a balanced arm does not fix the issue.
Arm feels free when moving by hand. I actually have a 1219 that plays perfect and cannot feel any difference with manual tonearm movement and this table. I am wondering if it is related to the tonearm bearings, and the adjustment screws on the vertical and horizontal. I cannot seem to track down any documentation on how to adjust these screws properly (other than creating a specialized tool).

Any advise on this type of calibration?

jdjohn
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Re: Dual 1229 Tonearm Adjustment

Post by jdjohn » 11 Oct 2016 00:17

Hi,

When you say it skips halfway through the record, do you mean it plays fine for the first half, then begins to skip, or repeat, or get stuck...or what exactly?

ebcdic
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Re: Dual 1229 Tonearm Adjustment

Post by ebcdic » 11 Oct 2016 00:22

It gets stuck on a single track and repeats. Exhibits the same behavior with different cartridges and tracking weight as well.

jdjohn
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Re: Dual 1229 Tonearm Adjustment

Post by jdjohn » 11 Oct 2016 00:57

In the 1229 service manual, page 14, figure 26 at the bottom: is all of that arranged properly? Also make sure the tonearm slide (part 253) is properly connected to the segment (201). I recently forgot to reattach it on one I was working on.

Kyluckyman
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Re: Dual 1229 Tonearm Adjustment

Post by Kyluckyman » 11 Oct 2016 04:05

There is a ball bearing in that tonearm slide. Check that to ensure it is clean and able to move as the tonearm moves along its path. I recall that being an issue for me when restoring my 1219 a few years ago. Dirt or out of round condition might create the problem you describe.

DSJR
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Re: Dual 1229 Tonearm Adjustment

Post by DSJR » 11 Oct 2016 08:11

Only other thing I can think of is the long lever that when engaged, indexes the beginning of the record. This should drop out of the way at the tonearm end just before the mechanism completes the cycle. Sorry, time prevents me itemising this part in the manual.

Osibisa1
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Re: Dual 1229 Tonearm Adjustment

Post by Osibisa1 » 13 Oct 2016 14:25

Also check to make sure the tonearm wires have enough slack. I had this happen to me after servicing.

Guest

Re: Dual 1229 Tonearm Adjustment

Post by Guest » 13 Oct 2016 15:29

And this is why turntable servicing was always an art, specifically for the experienced.

DSJR
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Re: Dual 1229 Tonearm Adjustment

Post by DSJR » 14 Oct 2016 11:08

With power disconnected, take Klaus' advice regarding tonearm friction. use a stamp on the headshell to check for vertical free movement and set the bias to a low setting (I'd say 0.5g myself or even 0.25g) and see how smoothly the arm moves back to the rest from the innermost position. These arms are superb and should have absolutely no notchiness or stiction whatsoever.

One final thing covered recently here is the trip pawls on the main cam, which should be totally free to move (Klaus suggests the TINIEST drop of fine silicon damping on the pivots to prevent excessive rattling).

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Re: Dual 1229 Tonearm Adjustment

Post by Guest » 15 Oct 2016 04:38

DSJR wrote:With power disconnected, take Klaus' advice regarding tonearm friction. use a stamp on the headshell to check for vertical free movement and set the bias to a low setting (I'd say 0.5g myself or even 0.25g) and see how smoothly the arm moves back to the rest from the innermost position. These arms are superb and should have absolutely no notchiness or stiction whatsoever.

One final thing covered recently here is the trip pawls on the main cam, which should be totally free to move (Klaus suggests the TINIEST drop of fine silicon damping on the pivots to prevent excessive rattling).
I agree with all that, it's simple for anyone to perform.
However, as to the silicone, I'd prefer to leave the trip dry, they came originally that way.

ebcdic
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Re: Dual 1229 Tonearm Adjustment

Post by ebcdic » 24 Oct 2016 23:11

It appears adjusting the plastic guide, Part #232 has fixed the issue. I could not eyeball the contact (or feel it) but sure enough it was dragging just enough to cause the binding. Loosening the screw while swinging the arm looking for movement allowed me to find the sweet spot.

Thanks for the suggestions everyone.

wysknz1
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Re: Dual 1229 Tonearm Adjustment

Post by wysknz1 » 25 Aug 2019 14:43

Guest wrote:
13 Oct 2016 15:29
And this is why turntable servicing was always an art, specifically for the experienced.
And how do the experienced gain experience?

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