R24 - Replace Combo Jacks?

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davegardner0
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R24 - Replace Combo Jacks?

Post by davegardner0 » Sat Aug 19, 2017 10:23 am

Hello all, first post here!

I have a Zoom R24 recorder that I've been using with great success for the last few years, but lately I've noticed that the TRS input on some of the XLR/1/4" combo jacks are very loose. They used to be way too tight but now the jacks are sometimes falling right out. Additionally when I plug in mono 1/4" plugs (from the insert jacks on my mixer) sometimes I can only get a signal if I insert them to the "first click" on the R24, and even still sometimes the audio gets fuzzy and/or cuts out during long recordings.

So I think the jacks are probably shot inside. I'd feel comfortable with soldering in new jacks, but the questions are (a) can the R24 be opened up, and (b) are replacement jacks available??

Thanks!
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Re: R24 - Replace Combo Jacks?

Post by Jim_Fogle » Sat Aug 19, 2017 1:46 pm

Good news and bad news.

First the bad news. Zoom N-A, the North American distributor of Zoom products, replaces defective product under warranty. That means service information is not commonly available, even to electronic repair shops.

The good news. If you are comfortable with opening your R24 without guidance and replacing surface mounted parts that were initially wave soldered then you should be able to to find replacement jacks. The jack was invented by a Swiss company called Neutrik. Here is a link: http://www.neutrik.com/en/xlr/combo-i-series/. Replacements cost about $6.00 but you'll need to know to know the pin out and if the connection pins extend from the bottom or rear of the connector. Next you'll need to find a source that sells small quantities. Here are two links I quickly found with an internet search: http://www.mouser.com/new/amphenolaudio ... dual-jack/ and https://www.amazon.com/Neutrik-NCJ10FI- ... B00HKTXE02

Finally, you need to take a look at the connectors of the cables you're plugging into your R24. The tip is supposed to always be the same size but some manufacturers follow standards more strictly than others. Monster cable (for one) is very well known for almost always using oversize components. Search through the forum and you'll see multiple postings where people have had tips come off a cable connector and remains stuck inside the jack. It's possible the jacks Zoom used are undersized.
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Re: R24 - Replace Combo Jacks?

Post by hoodoo voodoo » Sat Aug 19, 2017 11:56 pm

Jim's correct, in that it could be the shape or size of the 1/4" plugs you're inserting into the Zoom...particularly the tip shape profile. If you search through the forum to the posts where folks have had the tip of their 1/4"plugs break off and remain inside the Zoom, you'll see that it's often where the plug has a sharp angle to the tip point, rather than a smooth curve..so the 'sprung tongue' of the Zoom socket catches on to the tip, rather than allowing it to slide smoothly along the surface. Replacing your cables to those with a smaller and more rounded (less bulbous) tip will likely help.

Having done that, it is possible that once you've opened up the R24 casing, there's some way to push in a very thin screwdriver or other metal probe to 're-tension' the sprung tongue of the combo socket (that's if the combo isn't a completely sealed unit ?) If the design allows this, it will be an easier and less intrusive solution than replacing all the combo sockets. It's also possible that the sprung metal of the combo sockets Zoom has used on the R24 simply is too thin to retain its "springiness" over time, so socket replacement would be the best path.
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Re: R24 - Replace Combo Jacks?

Post by TheOldGuy » Sun Aug 20, 2017 9:20 am

It is indeed possible to open up the R24. It's a little more work than most other electronic devices, but at least Zoom used removable screws instead of snap-tabs or glue. Someone (not me) has done a teardown video of an R24 that might be helpful.

https://www.youtube.com/watch?v=KSDacaNZ0lA

Hope this helps.
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Re: R24 - Replace Combo Jacks?

Post by davegardner0 » Sun Aug 20, 2017 1:52 pm

Jim_Fogle wrote:
Sat Aug 19, 2017 1:46 pm
Finally, you need to take a look at the connectors of the cables you're plugging into your R24. The tip is supposed to always be the same size but some manufacturers follow standards more strictly than others. Monster cable (for one) is very well known for almost always using oversize components. Search through the forum and you'll see multiple postings where people have had tips come off a cable connector and remains stuck inside the jack. It's possible the jacks Zoom used are undersized.
hoodoo voodoo wrote:
Sat Aug 19, 2017 11:56 pm
Jim's correct, in that it could be the shape or size of the 1/4" plugs you're inserting into the Zoom...particularly the tip shape profile. If you search through the forum to the posts where folks have had the tip of their 1/4"plugs break off and remain inside the Zoom, you'll see that it's often where the plug has a sharp angle to the tip point, rather than a smooth curve..so the 'sprung tongue' of the Zoom socket catches on to the tip, rather than allowing it to slide smoothly along the surface. Replacing your cables to those with a smaller and more rounded (less bulbous) tip will likely help.

Having done that, it is possible that once you've opened up the R24 casing, there's some way to push in a very thin screwdriver or other metal probe to 're-tension' the sprung tongue of the combo socket (that's if the combo isn't a completely sealed unit ?) If the design allows this, it will be an easier and less intrusive solution than replacing all the combo sockets. It's also possible that the sprung metal of the combo sockets Zoom has used on the R24 simply is too thin to retain its "springiness" over time, so socket replacement would be the best path.

Thanks for this good info. The snake I'm using between my mixer and the R24 started life as a Hosa 8xTS to 4xTRS snake, and I chopped the 4 TRS plugs off and replaces with 8x mismatched TS plugs from my parts box. So they're all different brands and could be different shapes too, and this is the side of the snake I've been plugging into the R24. I'll take a look at them to see about the specific shape of the plugs, maybe I just need to flip around the snake and use the Hosa ends. I'll let you guys know what I find! If that doesn't seem promising then I think retensioning the springs would be the next best bet, followed by replacing the jacks (which I think I'd be comfortable doing).
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Re: R24 - Replace Combo Jacks?

Post by Jim_Fogle » Mon Aug 21, 2017 9:14 pm

TheOldGuy wrote:
Sun Aug 20, 2017 9:20 am
It is indeed possible to open up the R24. It's a little more work than most other electronic devices, but at least Zoom used removable screws instead of snap-tabs or glue. Someone (not me) has done a teardown video of an R24 that might be helpful.

https://www.youtube.com/watch?v=KSDacaNZ0lA

Hope this helps.
--
Tog.
Tog,

That video is a most excellent find. Thanks for sharing it with us. I had not seen it and enjoyed it very much.
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