1219/29 dearing ring repair and more.

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dualcan
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Re: 1219/29 dearing ring repair and more.

Post by dualcan » 12 May 2018 01:08

Here is a copy of page 6 from the 1219 SM with the ten steps to remove the tone arm from a 1219, (1229 and a 1229Q):
12109 T arm removal.jpg
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The next twenty pics will follow that plan. Each pic will correspond to those numbers, starting with TA 001:
TA 001.JPG
TA 001
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TA 002.JPG
TA 002
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I used the DIY stand which I highly recommenced when doing any work especially on a Dual tone arm. It is an easy built and the plans are in the Dual Service folder above.
TA 003.JPG
TA 003
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TA 004a.jpg
TA 004a
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dualcan
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Re: 1219/29 dearing ring repair and more.

Post by dualcan » 12 May 2018 01:13

TA 004b.JPG
TA 004b
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TA 005a.jpg
TA 005a
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TA 005b.jpg
TA 005b
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TA 005c.jpg
TA 005c
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dualcan
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Re: 1219/29 dearing ring repair and more.

Post by dualcan » 12 May 2018 01:22

TA 005d.jpg
TA 005d
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TA 006.jpg
TA 006
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Before doing step seven, it's advisable to move the cam out of its neutral position (the two red lines aligned together). The cam can be rotated in either direction:
TA 007a.jpg
TA 007a
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TA 007b.jpg
TA 007b
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TA 008a.jpg
TA 008a
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dualcan
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Re: 1219/29 dearing ring repair and more.

Post by dualcan » 12 May 2018 02:13

TA 008b.jpg
TA 008b
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TA 009_010a.JPG
TA 009 and TA 010a
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TA 010b.JPG
TA 010b
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TA 010c.JPG
TA 10c
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To replace/install arm the procedure is reversed.

At this point the client's extra parts need to be cleaned before mounting, along with the arm. My 1219 is a series one but the client's arm and AS parts are from series two. The main lever and some of the Anti Skate parts are slightly different.
These series 2 parts will mount however into my series 1, thereby allowing the A.S. adjustment and arm calibration, as we will see.

Since we have the cueing barrel out, we can now replenish it with 300.00 silicon oil:
DSC00101.JPG
Cueing barrel with lift rod; 1219 Ver 2
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When removing this cueing barrel in step 8, verify if you have 1219 series one or two. The split between Series 1 and 2 occurs from serial number 141,000 forwards.

In step eight, right after the bottom nut is removed (TA 008a), Series one of the 1219, will first require the removal of the top pimple (211) then the sleeve barrel (212) before it can be pulled out as shown in TA 008b.
For 1219 Series 2, 1229 and 1229Q, the procedure is the identical with one additional step. A C clip (170) between the pimple and the sleeve, must also be removed prior to the sleeve barrel's removal.
The next step will the cue lift re-lube.
To be continued,
k

dualcan
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Re: 1219/29 dearing ring repair and more.

Post by dualcan » 15 May 2018 00:38

To replenish the lift rod,
I use a 2 cc syringe because silicon oil is not one of my favourite things to handle; things tend to slide out of my hands for the rest of the day ..
Once the lift barrel is out of the chassis, and the adjusting sleeve is off, then there is one more c clip which holds the lift rod in place. Now the lift rod can be pulled out of the barrel:
DSC00107.JPG
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I inject a few drops of 300,000 weight into the barrel:
DSC00108.JPG
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But you can also just smear a bit near the top end:
DSC00109.JPG
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and slide it home.
Getting the silicon in on top where the spring is, allows the stuff to stay longer in the barrel and refilling will be delayed quite a bit.
To get this arm functional in my unit, I now need to get the segment in shape. First step is a thorough cleaning. Getting the rubber completely off the inner area, a Dremel with a brass wire brush is handy:
DSC00110.JPG
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Once clean, mounting a new rubber ring and the two cleaned steel balls come next
To be continued,
k

dualcan
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Re: 1219/29 dearing ring repair and more.

Post by dualcan » 17 May 2018 02:01

The two steel balls are inserted into their respective holes on the segment and the rubber ring is slipped over these two / into its cutout. Alvania will hold the balls in place and aid in mounting the ring:
DSC00123.JPG
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Slip the segment onto the gimbal's legs and carefully place the long spring leg as shown:
DSC00124.JPG
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Next comes the shut off slide. Don't forget the nylon washer under the c clip and the steel ball in the runway on top of the chassis:
DSC00125.JPG
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Slip in the pre-lubed lift rod barrel:
DSC00127.JPG
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and while its just through, attach the adjuster sleeve and upper pimple for version 1 and the second c clip between the sleeve and pimple for version 2 of the 1219 & 1229 & 1229Q:
DSC00153.JPG
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tbc
k

dualcan
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Re: 1219/29 dearing ring repair and more.

Post by dualcan » 17 May 2018 02:55

DSC00128.JPG
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DSC00129.JPG
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As the last sentence states, the outer dearing ring overlaps the inner and leaves it half covered as shown.

Now we get to the reason for mounting this arm. The client had the Anti Skate spring loose and subsequently it (the whole AS system) needs to be calibrated.
On the left is the AS oval version 2; on the right version 1:
DSC00130.JPG
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Both have a secondary hole which is used to align the disks for zero AS ---adjusted on the conical zero side for version one; version 2 only has one zero AS for both... In either case the dial on top has a detend when it gets to zero. That detend must be held in place while the tool holds the proper position of the wheel. Once aligned, the nut is tightened snug- don't overdue it - the AS wheel will crack otherwise...

Without this tool, it is still possible to align the zero AS position by holding the upper knob as before, incrementally tighten the nut (Do not forget the wavy washer!)
, while turning the oval to achieve maximum travel of lever 227 (where the springs attach..) towards the motor. Now tighten. That is the zero position of the A.S. oval/wheel.

If all the stars in heaven align, then looking straight down that hole, the point on the dearing ring (axis of tonearm) is visible:
DSC00134.JPG
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..and it won't be.. We do need to get to that point however:
DSC00135.JPG
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This adjustment will give us the actual Mechanical Zero for the arm or no Anti Skate force. If we don't achieve this, then all the AS setting will be off.
Next, we will see how we go about this adjustment, but first we must position the AS spring 215 and the AS tensioner spring 233.
tbc
k

dualcan
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Re: 1219/29 dearing ring repair and more.

Post by dualcan » 18 May 2018 16:54

Before mounting the A.S. system, we need to complete the surrounding structure under the segment. Since the client's parts are from (1219) version 2, I will restructure my 1219 accordingly. Version 2 parts are nickel plated as opposed to ver.1 which uses chrome plated parts.
A.S. lever 227 is already in place, so next are parts 219 to 222, spring 233 (between 221 and 194), 194/196,
A reminder: between 194 (equalizing arm) and 183 (lift rod/plate), there needs to be a bit of alvania:
DSC00139.JPG
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main lever 207 with all its parts:
DSC00151.JPG
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and cue lever 264:
DSC00152.JPG
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For the A.S. system, we need to add tension spring 188 between 237 and guide 221
and finally A.S spring 215 with crescent washer 216:
DSC00147.JPG
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DSC00148.JPG
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Handling and hook-up of spring 215 has to be done very carefully as it must provide a steady force of less than 0.25 gram over the disc's entire play area.
tbc,
k

dualcan
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Re: 1219/29 dearing ring repair and more.

Post by dualcan » 18 May 2018 17:10

With all the bits in place, let's do another arm friction test for vertical motion with
balanced arm:
DSC00154.JPG
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and with stamp:
DSC00155.JPG
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then, checking for mechanical zero as previously discussed, the arm must not move if held over record surface:
DSC00156.JPG
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and let go:
DSC00157.JPG
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As we can see the arm moved back to rest post so the mechanical zero needs adjustment.
For version one, the (chrome) arm needs to be bent:
DSC00172.JPG
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tbc
k

dualcan
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Re: 1219/29 dearing ring repair and more.

Post by dualcan » 18 May 2018 17:42

While the version 2 lever 227 is refined and has a 5.5mm adjustment bolt for this purpose:
DSC00158.JPG
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Guide 219 on plate 221 must also be positioned to ensure the arm's free movement in both Multi and Single (switch 73) lift position :
DSC00141.JPG
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Now arm moves freely up/down and sideways in both S and M position, we can start with the A.S. adjustment.
Initially I set the crescent washer 216 onto the A.S spring at about ten turns, as can be seen in previous pic 147. The balanced arm now does not move with 0 anti skate applied when hovering over record:
DSC00159.JPG
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To calibrate the AS spring, we need to attach the skate meter in the arm and set balanced arm:
DSC00162.JPG
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to 2 grams tracking, ready for adjustments:
DSC00163.JPG
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tbc
k

dualcan
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Re: 1219/29 dearing ring repair and more.

Post by dualcan » 18 May 2018 18:45

The test record (Dual/LO97) is a silent groove disc with precision cut spiral, as is the precision shaft (Dual part 212 697) so as not to "shake" the very sensitive skate meter during play:
DSC00164.JPG
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The skate meter is a centre reading instrument which has a maximum deflection of 250mG on either side.

Set up is complete:
DSC00165.JPG
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And initial measurement of the A.S spring with my initial ten turns, shows that the arm (A.S.) is under-performing by approx. 70mG:
DSC00166.JPG
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The arm is "skating" towards the record centre (centripetal force). The Anti-Skate force will counter this, by pulling the arm towards the rest post with the same amount of force, thereby leaving stylus in the groove without undue pressure to either flank.
This minimises uneven record and stylus wear, and ensures that both sound generators in the cart are on a level playing field.

The adjustment is carried out by "spinning" the crescent washer 216 in its recess provided in the segment's (181) arm:
1219 JB T 10d align.JPG
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Until the skate meter shows no deflection towards either side:
DSC00167.JPG
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tbc,
k

dualcan
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Re: 1219/29 dearing ring repair and more.

Post by dualcan » 18 May 2018 19:43

The A.S. is now set and the washer and spring (216/215) is locked onto the segment with a sealing agent:
DSC00168.JPG
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The original glyptol sealer is easier to break and remove from the groove when readjustment is necessary, but any nail polish will do subsequently - (colour is a matter of personal choice...).

Now that the A.S is aligned properly, we can actually check the horizontal bearing friction with some degree of relevance.
The A.S force is roughly 1/10th of the tracking force, so if we have 1 gram tracking, our aligned A.S. system will apply 0.1 g of sideways pressure, if set to "1" on the conical side of the dial (67).
By using ".5" or lower on this dial:
1219 RP T 6a.JPG
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we are actually applying 0.05g sideways force (or lower-according to dial) to the arm.
This force must be enough to move the arm back to the rest post because the specs state that the arm has a maximum horizontal friction of 0.015g.
You might have noticed the difference to the vertical arm friction (0.007g).
Although the two sets of bearings are identical, the difference is due to the extra drag imposed by the shut off lever 158 and its components.
As can be deduced from this extensive alignment procedure and specifically mentioned in every service manual, the A.S. seal must not be broken and all the relevant parts to the A.S spring must not be altered. Without these tools, the precise alignment is simply not possible.

From this point on, the arm's friction and the A.S system is calibrated.
The mechanisms driving the arm, such as main lever/lift rod height and clearances, both pimple clearances, cueing settings, start and stop indexing, need to be adjusted / corrected amongst other alignments. Pictures for these steps can be seen on my webpage under Service Tips and the various units listed thereunder.

As a last look into this arm, the tracking dial's accuracy is ascertained with the use of Lab grade Correx scale. The setting I use is 1 gram:
DSC00160.JPG
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and the result:
DSC00161.JPG
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The Dual changers and players from the Steidinger era were precise instruments as can be gathered, but in order to keep that precision, subsequent servicing must be equally precise, otherwise the precision is lost!

This arm and the A.S components along with some other parts will now be removed and returned to a very patient VE member -Eric- who will need to follow these alignments when reintegrating them into his unit.
Regards,
k

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Re: 1219/29 dearing ring repair and more.

Post by ricksbsa » 04 Jul 2019 00:40

I'm gaining quite a bit of information from your posts. These in particular.