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  #1  
Old 03-20-2012, 10:25 PM
R_Dub R_Dub is offline
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E&S DJR400 Mod question

i find the tone controls to be too close together and would like to get rid of the treble pots, keeping the bass pots only.
has anyone here ever taken their DJR apart?
assuming i can get at them how difficult would it be to remove the treble pots and just plug the holes?
my electronic building skills are not u to par with lots of you guys so consider me a dummy! haha.
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  #2  
Old 03-21-2012, 07:51 AM
Richi Richi is offline
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Why don't you source smaller knobs. I must admit i found this too, though i just adapted and now hold them differently, i hold them by the edges instead of grabbing the whole thing.

Removing them, you would need to get a hacksaw too cut the shaft off, you'll then need to plug the hole, if you need to sell it you would have to solder new pots in.

In order to remove the cover, you must remove every knob with an Allen key, then remove the screws holding the pots, then remove the screws on the bottom of the unit. I would not want to hacksaw the shaft whilst in the circuit, so you either buy a new pot and remove it from that then solder it back else you will need to solder a relevant fixed resistor value in it's place. Really don't recommended doing this.

Last edited by Richi : 03-21-2012 at 07:56 AM.
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  #3  
Old 03-21-2012, 08:47 AM
vinyl_junkie vinyl_junkie is offline
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Errrrm I don't think he want's to saw these off, this would put a lot of stress on the boards.

You would want to un-solder the pots and fit some some resistors as links in place of the old pots I would of thought
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  #4  
Old 03-21-2012, 09:00 AM
R_Dub R_Dub is offline
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ahhh, didn't know that the pots are that difficult to remove. i was hoping it was a fairly easy task. guess i'll look for smaller knobs. thx
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  #5  
Old 03-21-2012, 09:02 AM
R_Dub R_Dub is offline
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vinyl, what kind of resistor would i need?
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  #6  
Old 03-21-2012, 09:15 AM
vinyl_junkie vinyl_junkie is offline
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Quote:
Originally Posted by R_Dub
vinyl, what kind of resistor would i need?

That I'm not sure, have you tried emailing Jerome?
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  #7  
Old 03-21-2012, 09:21 AM
Richi Richi is offline
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Quote:
Originally Posted by vinyl_junkie
Errrrm I don't think he want's to saw these off, this would put a lot of stress on the boards.

You would want to un-solder the pots and fit some some resistors as links in place of the old pots I would of thought

Think i mentioned that.

Also all those ALPS pots, have already had the shafts cut, obviously done prior to soldering.

Last edited by Richi : 03-21-2012 at 09:52 AM.
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  #8  
Old 03-21-2012, 03:19 PM
R_Dub R_Dub is offline
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i'll see what jerome says.
I think this mod will be nice. I don't have much need for the EQs anyway (i'm used to mixing with a 1620) but having the ability to cut the bass back -12db individually is nice. smaller knobs might help but i think it will still be tight.
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  #9  
Old 03-21-2012, 08:42 PM
Richi Richi is offline
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Do you really want to do this, i really do suggest living with it for a while and or go the Knob route. You could remove the current Knobs right now which would give you space if required.

If you want to sell it in the future you maybe removing value from it as people want the feature!

Working on the internals is not easy when you have a hot soldering Iron in your hand, it's very cramped in there. You will need to unsolder 24 lugs to remove the Linear Pots. You would then need to solder in 8 resitors and jumpers, it's not just resitors when you replace a pot, they have 3 legs per wiper. They are Dual Gang 50k Linear Pots, i would hazzard a guess of around 20-30k for the value of resitor to eqaute for centre postion of the pot. I have not measured the centre postion, so it may need a different value.

You can see how cramped it is in there, you would not want to drop solder accross the tracks, as stated, working in there is very awkward.


Last edited by Richi : 03-21-2012 at 08:46 PM.
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  #10  
Old 03-21-2012, 10:14 PM
R_Dub R_Dub is offline
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thx for the photo!
a little daunting i'll admit!
good idea about just removing the treble knobs, might do the
trick although not to aesthetically pleasing.
i need to log more hours on it before doing anything drastic.
I have knobs on order - 6 week backorder wait.
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  #11  
Old 03-22-2012, 08:04 AM
darrylfunk darrylfunk is offline
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i'm pretty sure you can get smaller knobs from maplin in the uk cheap as chips....

http://www.maplin.co.uk/fluted-knobs-1819
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  #12  
Old 03-22-2012, 09:04 AM
Richi Richi is offline
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The ones in that range do not come small enough. The shaft on the pot is 6mm, you will struggle to find Knobs smaller than 11mm or so. If you filed the shaft down to 4mm, you could get 8mm knobs on there.

Trying holding your hand with your wrist parallel to the line of the EQ controls, then turning the knobs, this works much better than having your hand directly over them.

Good luck
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  #13  
Old 03-22-2012, 12:11 PM
R_Dub R_Dub is offline
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i found some nice pointer knobs that i have ordered.
they are similar to the 1620's knobs. but aluminum not plastic.
very expensive though. about 10 US each.
i don't like the stock knobs jerome uses. in a dark club it's hard to
tell where you're at. with the nice pointer knobs like 1620's you
could mix with you're eyes closed.
i think he probably uses the ones he does for cost reasons so i understand.
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  #14  
Old 03-22-2012, 12:14 PM
Mistick Krewe Mistick Krewe is offline
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i have a 1620 that has pointer knobs on the balance pots...

agree that they are very nice to have in a dark setting....
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  #15  
Old 03-23-2012, 12:38 PM
R_Dub R_Dub is offline
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are the shafts on the pots 6mm or 1/4 " (6.3mm)?
the knobs i ordered fit 1/4 " !
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  #16  
Old 03-23-2012, 12:46 PM
Mistick Krewe Mistick Krewe is offline
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I am not 100% sure...

can check/measure tonight or this weekend...
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  #17  
Old 03-26-2012, 03:27 AM
Pern Pern is offline
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It looks like the EQ PCB has edge connectors, if so you can just remove it from the mixer before removing the pots. And you need to replace them with 2 resistors per channel, half the value of the pot.
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  #18  
Old 03-26-2012, 08:05 PM
Richi Richi is offline
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Pern,

It's soldered onto the main board, not an option.
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  #19  
Old 03-27-2012, 01:29 AM
Pern Pern is offline
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OK, then i would not try to remove them if you are not used to soldering :-)
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  #20  
Old 03-27-2012, 01:41 AM
Richi Richi is offline
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Other problem is the outer lid remains attached as the LED VU cannot be removed, so this is another constraint when working on it. You also need a good magnifying light or glass to see what you are doing.
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