XV-5080 encoder replacement

Forum for JD, JV, XP and XV synthesizers from 1990's

Re: XV-5080 encoder replacement

Postby bluesplayer » 22:45, 2 February 2017

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
bluesplayer
 
Posts: 105
Joined: 00:40, 4 October 2004
Location: Rio Rancho NM


Re: XV-5080 encoder replacement

Postby genesis92 » 13:45, 3 February 2017

ok Modal, I will make a new post soon about the encoder replacement ;)
User avatar
genesis92
 
Posts: 19
Joined: 11:01, 9 January 2017
Location: Near Paris

Re: XV-5080 encoder replacement

Postby genesis92 » 14:46, 3 February 2017

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
Image

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)
Image

here is its part number: PEC11R-4220F-S0024
we can order it from Farnell, RS, Digikey and mouser.
it's not an expensive part
Image

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
Image

first step is to detach the PCB from the cable with solder iron and solder wick.
Image
Image

use solder wick to remove the old encoder
Image
Image

the old encoder uses a strange pinout so we must modify the wiring to the new one
Image

bend the pins
Image

drill two larger holes with 3mm bit
Image

cut the two external pins
Image

put the new encoder on the PCB
Image
Image

and solder it in place
Image
Image

use a bit of tinned copper wire and make a right angle as a hoock
Image
Image

solder it to the encoder pin
Image

and on the bottom of the PCB
Image
Image

do the same thing for the other pin
Image
Image

and cut the copper wire
Image

remove the green varnish of the PCB near the center pad of the encoder
to get a ground contact
Image

solder the pin to this ground connection
Image
Image

cut what exceeds
Image
Image

now use two insulated wires to make the A and B connections to the encoder and solder them like on the pictures
Image
Image
Image
Image
Image
Image
Image

the new and old encoders side by side
Image
Image

the PCB ready to be installed back in the unit
Image
Image

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
Image
Image

put the encoder back on the front
Image
Image

put the washer
Image

check the alignment
Image
use the hole to set the middle position
Image

and tight gently the bolt
Image
Image

you can now check with the switches front panel PCB hole if the encoder
is right in place
Image
Image
Image

check if it fit in the middle of the front panel
Image

and if it works well
Image

the first time it was not in the middle so....
Image

you must align it again and when it's ok you can tight the bolt
Image

use locking (or standard) varnish to be sure
Image

and voila! a new working encoder for your XV-5080! enjoy!
Image
User avatar
genesis92
 
Posts: 19
Joined: 11:01, 9 January 2017
Location: Near Paris

Re: XV-5080 encoder replacement

Postby bluesplayer » 16:31, 3 February 2017

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
bluesplayer
 
Posts: 105
Joined: 00:40, 4 October 2004
Location: Rio Rancho NM

Re: XV-5080 encoder replacement

Postby genesis92 » 16:37, 3 February 2017

you're welcome ;)
User avatar
genesis92
 
Posts: 19
Joined: 11:01, 9 January 2017
Location: Near Paris

Previous

Return to JD, JV, XP and XV series

Who is online

Users browsing this forum: No registered users and 1 guest