Alps Rotary Switch Dropout Issues for Input Select (e.g. Onkyo, Yamaha, Creek) - diyAudio
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Old 17th August 2014, 07:02 PM   #1
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Default Alps Rotary Switch Dropout Issues for Input Select (e.g. Onkyo, Yamaha, Creek)

Alps Rotary Switch for Input Select for Onkyo (e. g. Integra A-9711/9911) and Creek (5350SE)
The main issue at this Alps input selector is the use of contact grease resp. contact liquid between the contact springs at the plastic device and the contact itself (see the images). For this reason it is impossible to remove the internal unwanted transition resistances with the help of any kind of contact cleaners e.g. like follow:
CRC WebSite: Maintenance and Repair products
KOC WebSite: Maintenance and Repair products
KOC WebSite: Maintenance and Repair products
If it had not provided this lubrication at the contacts, I would use tuner 600 etc and success is provided.
This means, all kind of switches like the follow URLs must be disassembled.
http://bilder.hifi-forum.de/max/5999...273o_69807.jpg
Onkyo A-9711 - Welche Funktionen fernbedienbar?, Verstärker/Receiver - HIFI-FORUM
http://images.gutefrage.net/media/fr...fekt/0_big.jpg
Wer kennt sich mit ONKYO- integra Vollverstärker A-9911 aus? Eingangswahlschalter defekt! (onkyo-integra-a-9911)
Onkyo A-8051 und kranke Schalter von ALPS
View image: 20130429 151559
View image: 20130429 151526
The attached images are from me.
Clearly to see are the contacts before and after cleaning. After assembly the rotary switch and resold on the PCB the user get a kind of operating while the input select like new condition, i. e. without any dropouts at one of the channels.
It is particularly difficult (very hard) to desolder the rotary switch in such cases, where the solder pins were bent before soldering.
In case of breaking the solder pins silver wires must be soldered. That means the risc of alter the correct installation position.
Attached Images
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File Type: jpg CAM00726.jpg (533.4 KB, 120 views)
File Type: jpg CAM00728.jpg (348.4 KB, 113 views)
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File Type: jpg CAM00735.jpg (491.5 KB, 107 views)
File Type: jpg CAM00741.jpg (646.2 KB, 51 views)
File Type: jpg CAM00742.jpg (574.1 KB, 48 views)

Last edited by tiefbassuebertr; 17th August 2014 at 07:14 PM.
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Old 17th August 2014, 08:24 PM   #2
Bare is offline Bare  Canada
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Nicely done! How did you remove the worn ridges in the contacts?
I do wonder though, just how long your patch will survive for.
Many have found such work as only delaying the inevitable.
Real issue is these are Low Quality switches.. Period.
The contacts are thin, soft and largely inadequate for significant ongevity.. at least much beyond the Unit's Mfg Warranty.
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Old 18th August 2014, 11:08 AM   #3
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Quote:
Originally Posted by Bare View Post
Nicely done! How did you remove the worn ridges in the contacts?
I do wonder though, just how long your patch will survive for.
Many have found such work as only delaying the inevitable.
Real issue is these are Low Quality switches.. Period.
The contacts are thin, soft and largely inadequate for significant ongevity.. at least much beyond the Unit's Mfg Warranty.
I don't understand the marked term.
However - you are right with your estimate with bad reliability and short longevity in some cases. But most amps work since several years without trouble after doing this work.

In this case I have a question: In which other amp models this kind of Alps rotary switches are in use?
I know until now this models:
1) Creek 5350SE
2) Onkyo Integra 9911 and 9711
3) Onkyo A8051
4) Pioneer A501R

Because this switches at Alps no longer available such list of amp models are helpful to get parts for replace faulty parts like spring contacts.
Thanks for advices.

Last edited by tiefbassuebertr; 18th August 2014 at 11:17 AM.
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Old 18th August 2014, 02:01 PM   #4
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There is some Yamaha , a few Sansui AUX series , the Arcam delta 290 and also got to be a few Marantz also .

The switch has been an issue many years now and cleaning even if done your way ( we do it with other ways also ) so beyond cleaning always there will be an issue of how firm the contacts will be .

Been cleaning some with 100% success but some other i had to replace with relay boards ( lost the remote though ) to keep the amp running .

@ tiefbassuebertr Please check your PM list i ve send you a message but it was never replied

Kind regards
Sakis
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Old 8th September 2014, 12:31 PM   #5
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The rotary swich from this amp I have had shortly for disassembly and cleaning:
Minhembio.com - Hemma hos Buj - Under skalet på anläggningen
the closer inside look shows the same problems than the pics from post #1.

From Sansui I don't know models, where this switch or similar versions are in use.
Additional I want to know the exact order code resp. modell No from Alps.
The actually products are all other kinds of rotary switches:
http://www.alps.com/prod/info/E/HTML...ary_list1.html
The most used kind of input selector switches in amps without remote control are follow:
http://forums.naimaudio.com/fileSend...0selector..jpg
http://www.electronicsurplus.com/alp...ole-5-position
http://thumbs2.ebaystatic.com/d/l225...LpoD9GIKTQ.jpg
The kind of rotary switch from post #1 seems to be relatively rare.
Where I can order this Alps rotary swich from post #1 ??
Thanks for advices.

Last edited by tiefbassuebertr; 8th September 2014 at 12:48 PM.
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Old 15th September 2014, 09:11 AM   #6
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no informations?
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Old 15th September 2014, 03:30 PM   #7
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Look here: Condor Audio |
and download the Arcam upgrade pdf under the Projects tab
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