Go Back   Home > Forums > >
Home Forums Rules Articles diyAudio Store Blogs Gallery Wiki Register Donations FAQ Calendar Search Today's Posts Mark Forums Read

Everything Else Anything related to audio / video / electronics etc) BUT remember- we have many new forums where your thread may now fit! .... Parts, Equipment & Tools, Construction Tips, Software Tools......

Pure Evoke-3 radio
Pure Evoke-3 radio
Please consider donating to help us continue to serve you.

Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving
Reply
 
Thread Tools Search this Thread
Old 10th October 2017, 10:42 PM   #1
MikeVou is offline MikeVou  United Kingdom
diyAudio Member
 
Join Date: Oct 2012
Location: Bristol, United Kingdom
Default Pure Evoke-3 radio

I have seen that there are Pure radio owners discussing problems on this forum, and I wonder if any of them can help me.
The display on my 10 year-old Pure Evoke-3 has gone very dim – only just readable in strong light even with the software Brightness setting at maximum. Since the backlight brightness is actually adjustable (from ‘almost invisible’ to ‘just about readable in good light’), it seems like the voltage to the backlight is low – possibly a feed resistor gone high in value or a faulty voltage regulator. Pure are notorious for their disinterest in support with service information, so can anyone answer these questions –

1. The display board seems to be held captive by the three control knobs after the pcb mounting screws are removed. The amount of force needed to remove them from their shafts seems to be huge. Is it safe/normal to just pull them as hard as necessary to remove – I’m afraid of damaging the switch mechanisms or destroying the knobs with the force needed.

2. Can anyone help with locating the backlight power supply components when I’ve removed the display pcb? Also the correct feed voltage for the backlight, and the voltage feed pins on the display?
  Reply With Quote
Old 20th April 2018, 09:04 PM   #2
OXAUDIO is offline OXAUDIO  United Kingdom
diyAudio Member
 
Join Date: Sep 2006
Sorry I didn't see this thread sooner. The knobs are held in place by some kind of tape over the ends of the shafts and the only way I've found to remove them, is by gently prising whilst pulling. An old dodge was to use a length of nylon drive cord or something similar wound around the rear of a knob (behind the actual knob of course, then pulling the ends of the cord. Not tried that with a PURE radio, but it might work. Two of the three controls are held in place by nuts & washers. Once the knobs are off the nuts can easily be undone with a suitable diameter nut spanner or socket. Two different sized nuts are used. One thing of which to be aware is that the display is connected to the board via a ribbon cable inserted into a latched socket below which a rubbery pad is stuck. The pad must be carefully peeled back and the ribbon unplugged before the PCB can be removed. I don't know the voltage of the backlight, and have never made notes as to the voltages on the display pins so cannot help with that. At the time of writing this I am trying to source a replacement display for an Evoke 3. PURE of course won't supply any parts, but I spoke to someone at their technical dept. this afternoon, and was quoted 60.00 for a repair to this model. PURE can be contacted on 0845 1489001, during U.K. office hours, by the way.
  Reply With Quote
Old 20th April 2018, 10:52 PM   #3
MikeVou is offline MikeVou  United Kingdom
diyAudio Member
 
Join Date: Oct 2012
Location: Bristol, United Kingdom
Thanks for taking the trouble to reply. I did solve the problem in the end - much as you suggest - a very thin screwdriver blade is able to reach in and behind the knobs to lever them off - helped by a bit of pulling as well, Pulling alone - even with padding and pliers - doesn't seem to shift them at all (I never worked out why). I posted some photos of the process on original thread.

Thanks again.
  Reply With Quote
Old 21st April 2018, 07:46 AM   #4
OXAUDIO is offline OXAUDIO  United Kingdom
diyAudio Member
 
Join Date: Sep 2006
Hopefully my thread will assist other members needing to dismantle PURE radios generally, and Evokes in particular!
  Reply With Quote
Old 6th July 2018, 01:17 PM   #5
EFS is offline EFS
diyAudio Member
 
Join Date: Jul 2018
To the original poster, I have a similar problem with an Evoke 3 and was wondering whether you had found the source of your particular problem. I haven't taken the front panel PCB off yet, but the voltage between the red and black wires that disappear into a huge blob of hot-glue seems to vary with back light level and I was wondering if that was the drive voltage? There's an SMD transistor marked 1F connected to the black lead, but I don't know whether this is a bipolar device or an FET (the smd markings websites list both.)

Any advice welcome.
  Reply With Quote

Reply


Pure Evoke-3 radioHide this!Advertise here!
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
Pure Player npetralias PC Based 534 13th October 2017 03:32 PM
Portable radio won't tune into radio 2 soul music Analogue Source 59 9th August 2017 10:44 AM
Internet Radio vs Broadcast Radio - Bandwidth ? Bigun Digital Source 13 6th December 2015 12:54 PM


New To Site? Need Help?

All times are GMT. The time now is 03:30 AM.


Search Engine Optimisation provided by DragonByte SEO (Pro) - vBulletin Mods & Addons Copyright © 2018 DragonByte Technologies Ltd.
Resources saved on this page: MySQL 15.79%
vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2018 DragonByte Technologies Ltd.
Copyright ©1999-2018 diyAudio
Wiki