Identification for onboard switch needed (Receiver Pioneer A-331)

[Jens Herrmann]

Hello,
the source selection on the front panel of the Pioneer A-331 has 6
switches of which 4 are temporary switches (source) and 2 are permanent
switches (tape monitor). They have stopped working properly and I was
not able to fix the problem with contact spray this time. Now I want to
replace them but cannot identify the brand and model.

Take a look at
http://img3.fotos-hochladen.net/uploads/pioneera331woivr6zn0p.jpg
The footprint on the bottom side is a 2x6 dil -> 12 contact pins. Note
that it is not possible to use a random model switch with the same
footprint as there is a release mechanism which then would not work
anymore. Thats why the blue knobs have the shape they have.

Regards
Jens

 

[Phil Allison]

"Jens Herrmann"

Hello,
the source selection on the front panel of the Pioneer A-331 has 6
switches of which 4 are temporary switches (source) and 2 are permanent
switches (tape monitor). They have stopped working properly and I was not
able to fix the problem with contact spray this time. Now I want to
replace them but cannot identify the brand and model.

Take a look at
http://img3.fotos-hochladen.net/uploads/pioneera331woivr6zn0p.jpg

** There is no sign of residue on the switches in the pic.

So you used an evaporative contact spray like Freon or IPA.

IME, usually only of short term benefit - if any at all.

Try some WD40 or similar spray lubricant - seriously bet it makes all the
switches work again.



.... Phil

 

[Jens Herrmann]

** There is no sign of residue on the switches in the pic.
So you used an evaporative contact spray like Freon or IPA.

Yes evaporative, but I had to open the switches to apply it.

Try some WD40 or similar spray lubricant - seriously bet it makes all the
switches work again.

I would prefer to replace them as the switch mechanism inside did not
look very well.

Jens

 

[Phil Allison]

"Jens Herrmann"

Yes evaporative, but I had to open the switches to apply it.

** Silly, risky thing to do.

WD40 works in seconds with no disassembly.

I would prefer to replace them as the switch mechanism inside did not look
very well.

** You have NOTHING to lose by TRYING my suggestion.

Been working near miracles for me, nearly every day, for 40+ years.



.... Phil

 

[N_Cook]

Hello,
the source selection on the front panel of the Pioneer A-331 has 6
switches of which 4 are temporary switches (source) and 2 are permanent
switches (tape monitor). They have stopped working properly and I was
not able to fix the problem with contact spray this time. Now I want to
replace them but cannot identify the brand and model.

Take a look at
http://img3.fotos-hochladen.net/uploads/pioneera331woivr6zn0p.jpg
The footprint on the bottom side is a 2x6 dil -> 12 contact pins. Note
that it is not possible to use a random model switch with the same
footprint as there is a release mechanism which then would not work
anymore. Thats why the blue knobs have the shape they have.

Regards
Jens

Even robbing a salvaged one is problematic as the plastic body of those
sort of switches can only take the bare minimum of soldering heat before
they start to deform. Can you wire in switches to somewhere that has
more space and can take more conventional switches , assuming you cannot
find an exact replacement. I've burrowed inside similar switches and I
would say they are next to impossible to rebuild, even if you can safely
get them apart with their sub-mm parts

 

[Tim Schwartz]

Hello,
the source selection on the front panel of the Pioneer A-331 has 6
switches of which 4 are temporary switches (source) and 2 are permanent
switches (tape monitor). They have stopped working properly and I was
not able to fix the problem with contact spray this time. Now I want to
replace them but cannot identify the brand and model.

Take a look at
http://img3.fotos-hochladen.net/uploads/pioneera331woivr6zn0p.jpg
The footprint on the bottom side is a 2x6 dil -> 12 contact pins. Note
that it is not possible to use a random model switch with the same
footprint as there is a release mechanism which then would not work
anymore. Thats why the blue knobs have the shape they have.

Regards
Jens

Have you tried contacting Pioneer's parts department in your area?

--Tim

 

[Phil Allison]

"Rheilly Phoull"

How does the WD40 go for pots ?

** If a squirt of WD40 does not restore good operation - nothing else
will.

But be very careful with linear faders as it can dissolve the grease that
gives them a nice feel - if possible, open them up and clean the track and
wipers with a rag and small brush dipped in WD40.

I have always thought it was short term and destructive.

** Nonsense.


.... Phil

 

[N_Cook]

DeOxit Red is what I use for rotary pots. Deoxit Gold for switches and
jacks. They make a DeOxit for linear pots, but it often makes things
worse. Use a swab with Lubriplate, after careful diassembly and cleaning.

going by what looks like broken pcb in that photo, then likely
mechanical damage to the switch, chemicals will not remedy that

 

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[Phil Allison]

"Jeff Liebermann= IDIOT "

"Phil Allison":


That works, if you don't mind doing it again in about a month.

** Wrong.

The residual oils left behind by WD-40 seems to turn to sticky gum.

** Yawnnnn...


..... Phil

 

[Phil Allison]

"dave"

WD40 is known to delaminate pc boards.

** ROTFL !!

It kills cockroaches too.


..... Phil

 

[Phil Allison]

"dave"

DeOxit Red is what I use for rotary pots.

** I have a small ( 75ml) can of Caig "DeOxit D100" in the workshop -
bought it a few years ago for a price about 10 times that of WD40.

Dammed if I can find a single job it is any good for.

It has almost no penetrating ability and is a poor grease solvent.

WOFTAM.



.... Phil

 

[Geoff]

** I have a small ( 75ml) can of Caig "DeOxit D100" in the
workshop - bought it a few years ago for a price about 10
times that of WD40.

Dammed if I can find a single job it is any good for.

It has almost no penetrating ability and is a poor grease
solvent.

WOFTAM.



... Phil

What about CRC 5-56, how dya reckon it compares with WD-40?

 

[Phil Allison]

"Geoff"

"Phil Allison"


What about CRC 5-56,

** You tell me - sunshine

Almost 40 years ago, I used CRC 2-26 for the same jobs as WD40.



..... Phil

 

[Phil Allison]

"dave the drongo "

D100 has no solvents.

** So WTF is it any good for ?

That is why you can't use it on your greasy electronics.

** I never use WD40 on electronics.

Just mechanicals like pots, switches and connectors.

Intermittents in ICs and other semis seem to be totally impervious to the
stuff..........




.... Phil

 

[Trevor Wilson]

Hello,
the source selection on the front panel of the Pioneer A-331 has 6
switches of which 4 are temporary switches (source) and 2 are permanent
switches (tape monitor). They have stopped working properly and I was
not able to fix the problem with contact spray this time. Now I want to
replace them but cannot identify the brand and model.

Take a look at
http://img3.fotos-hochladen.net/uploads/pioneera331woivr6zn0p.jpg
The footprint on the bottom side is a 2x6 dil -> 12 contact pins. Note
that it is not possible to use a random model switch with the same
footprint as there is a release mechanism which then would not work
anymore. Thats why the blue knobs have the shape they have.

Regards
Jens

**Dismantle the switches and clean with De-Oxitâ„¢.

 

[Phil Allison]

"Trevor Wilson"

**Dismantle the switches and clean with De-OxitT.

** Stupid, wrong advice.

De-Oxit = Cramolin = snake oil.




..... Phil

 

[William Sommerwerck]

"Phil Allison" wrote in message
** Stupid, wrong advice.
** De-Oxit = Cramolin = snake oil.

You've obviously never used the stuff.

I've been using it since the late '70s. The Red does a great job lifting the
film from tin- and nickel-plated surfaces. The Gold does as nearly a good job
on gold-plated surfaces.

The 100% solution is not a lubricant. And I make no claims for its improving
sound quality.

 

[Trevor Wilson]

"Trevor Wilson"


** Stupid, wrong advice.

De-Oxit = Cramolin = snake oil.




.... Phil

**Try using the stuff sometime. It does what it is claimed to do.
Naturally, the spray stuff is useless, but the type that you paint on,
leave for a few minutes and wipe off works very well indeed. Switches I
treated many years ago have long outlasted new replacements.

 

[Phil Allison]

"William Sommerwanker Nut Case"

"Phil Allison"
** Stupid, wrong advice.

** De-Oxit = Cramolin = snake oil.

You've obviously never used the stuff.

** Only nut cases use it.

I've been using it since the late '70s.

** You've been a nut case much longer.

The Red does a great job lifting the film from tin- and nickel-plated
surfaces. The Gold does as nearly a good job on gold-plated surfaces.

** Shame how it is fucking useless at fixing noisy pots and switches.

The 100% solution is not a lubricant. And I make no claims for its
improving sound quality.

** The stuff does NOT do what WD40, CRC 2-26 and a host other similar
fluids do in seconds.

It is not a grease solvent, not a lubricant and does not penetrate small
gaps and flow.



.... Phil