XV-5080 encoder replacement

Forum for JD, JV, XP and XV synthesizers from 1990's
bluesplayer
Posts: 136
Joined: 00:40, 4 October 2004
Location: Rio Rancho NM

Re: XV-5080 encoder replacement

Post by bluesplayer »

Modal

YES, YES, YES: GENEIS92, my apologies to both of you. I'm old and easily confused - LOL

In any case, glad there are still folks staying on top of this module
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genesis92
Posts: 22
Joined: 11:01, 9 January 2017
Location: Near Paris
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Re: XV-5080 encoder replacement

Post by genesis92 »

ok Modal, I will make a new post soon about the encoder replacement ;)
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genesis92
Posts: 22
Joined: 11:01, 9 January 2017
Location: Near Paris
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Re: XV-5080 encoder replacement

Post by genesis92 »

as requested here are the details on how to replace the XV-5080 encoder.

-> you make it at your own risks and you must have electronic skills to do it.

To get the old encoder you must open the cover and remove carefully the front panel.
Remove the crews holding the right switch panel PCB
The original part from ALPS
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the specs of the new one.
it seems electrically compatible but with a thinner threaded shaft.
the number of detents is lower than the original (24 instead of 36 but it's not an issue)
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here is its part number: PEC11R-4220F-S0024
we can order it from Farnell, RS, Digikey and mouser.
it's not an expensive part
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a first test to confirm it works but the service manual schematics shows a
quadrature decoder instead of the JD-990. so all works fine
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first step is to detach the PCB from the cable with solder iron and solder wick.
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use solder wick to remove the old encoder
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the old encoder uses a strange pinout so we must modify the wiring to the new one
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bend the pins
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drill two larger holes with 3mm bit
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cut the two external pins
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put the new encoder on the PCB
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and solder it in place
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use a bit of tinned copper wire and make a right angle as a hoock
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solder it to the encoder pin
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and on the bottom of the PCB
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do the same thing for the other pin
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and cut the copper wire
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remove the green varnish of the PCB near the center pad of the encoder
to get a ground contact
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solder the pin to this ground connection
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cut what exceeds
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now use two insulated wires to make the A and B connections to the encoder and solder them like on the pictures
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the new and old encoders side by side
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the PCB ready to be installed back in the unit
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the new encoder is thinner than the old one and thus we must solder
the cable on the bottom of the PCB like on the picture
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put the encoder back on the front
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put the washer
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check the alignment
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use the hole to set the middle position
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and tight gently the bolt
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you can now check with the switches front panel PCB hole if the encoder
is right in place
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check if it fit in the middle of the front panel
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and if it works well
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the first time it was not in the middle so....
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you must align it again and when it's ok you can tight the bolt
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use locking (or standard) varnish to be sure
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and voila! a new working encoder for your XV-5080! enjoy!
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bluesplayer
Posts: 136
Joined: 00:40, 4 October 2004
Location: Rio Rancho NM

Re: XV-5080 encoder replacement

Post by bluesplayer »

Thanks from this forumite

Great detailed "how to." I use to be a electronics tech in another life [TUBE age avionics] and still do own amp and other repairs/mods so not adverse to this kind of work - just too lazy to do the needed homework.

Again thanks
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genesis92
Posts: 22
Joined: 11:01, 9 January 2017
Location: Near Paris
Contact:

Re: XV-5080 encoder replacement

Post by genesis92 »

you're welcome ;)
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