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SX-1050, SX-1250 speaker switch differences

Mike Ray

Mike Ray

New Member
Hi all. Having had the 1050 and now the 1250, the ONLY thing I don't like on the 1250 is the speaker switch. On the 1050 I could select speakers 1,2 or 3 without effecting the position of the other switch positions. On the 1250 if I have say speakers 1 selected and then select speakers 2 or 3 then speakers 1 pops out. I can get 2 sets selected but have to fiddle with them. Can anyone shed any light on this and does anyone know if the 1050 switch bank can be exchanged for the 1250. Cheers.
 
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Hi Mr. Mike Ray,

Welcome to AudioKarma. If I understand you correctly, you are saying you can only select 1 set of speakers at a time on the 1250?

Example: If you select (A), than (B) or (C) will not stay locked in the "on" position?

I know the filter switches, and source selections on the unit are set that way, but I don't remember my speaker selector buttons having that function. I know you can only run (2 sets) of speakers at a time, and if you tried to run all 3 A,B, and C all output would cut out.

I wonder if the selector board has been replaced at some point, or if some of the 1250's were set up that way. I don't remember mine doing that...

Have you checked out the board, maybe clean the switches with some Deox-IT? may not fix anything, but if you see the board you should be able to see if anyone has modified it or done any work to it.

You will need to access that board from the underside of the unit. If you are not familiar with electronics, I'd suggest taking it to a professional. If you feel confident, by all means, but you wont know for sure until you have eyes on the board.

Hopefully others will chime in with more/better suggestions.

Hope you get it going man.

Kind Regards,
John
 
That is NOT how a factory stock SX-1250 speaker select switch (AWS-095) works. In fact the SX-1050 uses EXACTLY the SAME AWS-095 board and switches.

I would check how the board was mounted in the under-chassis.Pull the faceplate, loosen the 4 mounting screws (2 for the three switch bank, 2 for the headphone jack) jiggle it some and test it loose. Then tighten it and test it again.

the speaker select board is aws-095, it has 3 rather unique switches on it, each has 8 gangs of switches, the only other 8 gang switch is the AM on the function selector board. Each of the 3 speaker switches IS MECHANICALLY INDEPENDENT. That means that a b and c can ALL be locked IN/ON independently and together.
Electronically the extra gangs are used to shut down the outputs when 3 speakers are turned on together.

How do I know this? I have BOTH BOARDS (function selector and speaker selector) in front of me RIGHT NOW. To refresh my memory. When I rebuild a unit all switches are disassembled and cleaned, so I am intimately familiar with their innards.

The innards of a speaker switch and an AM switch are identical except for the addition of a very small round spring and follower finger contained in the white cap of the speaker select switch to allow independent action.
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Externally, an interlocked gang switch (like the function switch) has a transfer bar that rides in the metal u shaped frame that holds all the interlocked switches, and as ANY switch in the gang is pushed in, the transfer bar releases it's hold on any switch that the transfer bar HAD been holding in.

The ONLY way that I can see that could cause a mechanical interlock between the three is what my signature line addresses:
Nothing is ever completely fool proof, because fools are so ingenious.

I could see it as a markthefixer level joke on someone - it would take a bit of ingenuity to pull off.
The small round springs and follower fingers for the speaker switches would need to be removed and a function selector bar cut down for 3 positions and installed - and installation REQUIRES the desoldering and removal of the switches to fit the bar in. Of course the boards would have to be removed from the front panel, essentially stripping out the front of the unit. A LOT of work.
 
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The purpose of the switch arrangement is to keep you from engaging 3 pair of speakers at once. The switches should only allow 2 pair of speakers at any one time or combination. Is that what your 1250 is trying to do?
 
markthefixer has it right. I currently have a 1050 to compare with and on that all 3 switches act independently and if all 3 are selected all output is cut.

On this 1250 however, the speaker switches act like the input switches, which is odd as 2 sets of speakers should be able to be selected at once, so to my mind should act like the 1050.

I'm wondering if the switch unit has been changed at some point. I've only just bought it so will have a look tomorrow.....or rather later today as it's 2:45 am here in the UK. I've just received new filter caps so planning to change them over the weekend along with the caps on the soft start board as one of the 470uf's has got a split around the circumference of the casing. Will update when I've had a look.
 
IMG_1337.JPG IMG_1336.PNG I've had the 1250 apart this afternoon and re capped the soft start board which also gave me an opportunity to take the facia off and have a look at the speaker switch.
There's a bar that runs between the 3 switches with a spring which is why the other switches pop out if another switch is pressed. I then had a look on eBay and there's a switch unit on there and low and behold.....no bar!, so i can only imagine the switches in this unit will act independently. I didn't want to start dismantling in case I couldn't get it back together and for the cost...or rather postage from the US I think I'll stick with what I've got at the moment. I'll look out for one in the uk and perhaps just swap the switch unit complete.
I'd did give me a chance to clean the facia and the rear of the glass properly so not a wasted afternoon.
 
Maybe they weren't all the same? I couldn't say, as I don't know anybody else that has one that I could look at.
 
Yours is the first in my loooooong experience. The presence of the bar seals the deal and you COULD press two at (exactly the same) a time.

The only clue would be the end(s) of the bar, if it looks "factory" or improvised. This is exactly what I was thinking of when I said "a markthefixer level joke".

Perhaps this was done to protect the unit from a doofus of a former owner? Took a LOT of doing.
 
So, if I was to have three sets of speakers hooked up, and depressed all three switches, all audio would shut off? I only have speakers hooked up to "A" and "B". So, I don't know.
 
markthefixer said:
Yours is the first in my loooooong experience. The presence of the bar seals the deal and you COULD press two at (exactly the same) a time.

The only clue would be the end(s) of the bar, if it looks "factory" or improvised. This is exactly what I was thinking of when I said "a markthefixer level joke".

Perhaps this was done to protect the unit from a doofus of a former owner? Took a LOT of doing.
Click to expand...
It's definitely a factory job mark so I can only assume mine is a later or earlier model which had the different switch cluster. Either way it's bugging me so I'll look for a replacement switch instead of trying to mod mine in case I get springs flying out Interesting tho!
 
My 1250 allows all 3 to be depressed. You may have an example of a Pioneer factory anomaly.. The production line was probably out of that board, and some engineer said: this one will work .. lol if it was a coin or a baseball card, it would be worth a fortune..
 
Another difference I've only just noticed last evening while browsing eBay was that my 1250 has a 3 cord power lead with a kettle type socket built into the back panel and no AC outlet sockets like my 1050 had, and like the 1250 back panel on eBay has?
 
I've found the answer!
I've looked through the paperwork that came with it (original receipt, sales brochure etc), and it would appear that mine is a 'HG' version for the Sweden, Denmark and Netherlands market although mine was bought from a branch of Comet in London on 7th Sep 1978. Quite why this version was sold in U.K. I don't know but it seems it was.
In the operating manual it says that two or more speaker sets cannot be selected together which explains the switch. I'm now tempted to leave it standard and use the speaker switch as I've been doing by selecting 2 at the same time carefully.
Any thoughts gratefully received?? Cheers!
 
sounds good, I can't disagree with anything in your last post.

I will have to look up the schematics for the HG version and study them, just out of curiousity.
 
The OM for the SX-5580 states that even if all three speaker switches are depressed, only two sets will play. I don't know how the unit decides which speaker set to not play but this is for the protection of the unit because using 8Ω speakers would yield a <3Ω load with three sets playing.
 
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