Sansui ca-3000

loudvette

New Member
Hi all, recently purchased a ca-3000. Running tests, the right meter 4300840 meter dead. Where can I get one?
#riffshifi
 

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I did ohm it. Left moves right nothing. It’s also stuck low on the range and won’t move with powering up or balance or input changing.
 
Looks like it's jammed; maybe a piece of crud between the coil and magnet? I wouldn't ohm it for testing. It probably only takes a couple of hundred millivolts for full scale...
 
Ok I was going to quote Punker X but it looks like you've already tested it:

First you need to determine if the meter is bad or not. You can take a multimeter on the lowest ohm's setting and just touch the leads of the meter. It should defect the meter. You may have to reverse the leads to get a positive movement. Just touch the meter, don't hold the leads on the meter for an extended time. You just want to see if it moves with voltage or not. If its good then we can look at way it isn't moving. My initial thought would be a bad transistor, but could also just be dirty switches, old caps, broken wire, bad solder joint, etc.
 
I haven't tested that particular meter but they're typically 200-300mV and 200-300uA for full scale. Multi-meters push out about a volt and you've got a meter there that could be very hard to replace... I already looked in sansui-parts-shop and he doesn't have any. If your ohm meter flicked when you tested the movement at least it tells you the coil isn't open.
 
I haven't tested that particular meter but they're typically 200-300mV and 200-300uA for full scale. Multi-meters push out about a volt and you've got a meter there that could be very hard to replace... I already looked in sansui-parts-shop and he doesn't have any. If your ohm meter flicked when you tested the movement at least it tells you the coil isn't open.

No flicker. Could be stuck, but look at the pics, you will see the right meter is below the chart. Ill pull it open tonight and see if it has shit in it
 
Ill pull it open tonight and see if it has shit in it
Be careful, those meter suspensions are extremely delicate - and as already hinted - even the voltage from a multimeter could damage the coil unless applied for a very short time. Hidden out of sight in your pictures there is usually a mechanical zero setting adjuster (like the head of a screw) in the front panel of the meter, you could try gently turning that to see if you can move the needle.
 
As others have said, be very careful but it seems to be jammed and holpfully you can free it. There is one for sale on Ebay but its going for $190, so as we say, BE CAREFUL
 
As others have said, be very careful but it seems to be jammed and holpfully you can free it. There is one for sale on Ebay but its going for $190, so as we say, BE CAREFUL
the one on ebay is a 4300841 and mine is a 4300840 is there a difference? i don't want to buy one but rather fix it..
 
sounds like the coil or a connection to it is open somewhere. Hairsprings both connected? Fact that it's reading downscale suggests maybe a spring is not connected. Looking at a spare MC movement I have it may be that the upper hairspring (ie nearest the dial) may have become disconnected...
 
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I would look at the other one that works to see what is going on. You will likely HAVE to repair that meter. Finding one of them is likely impossible.
 
Try swapping the leads going to the meters (if possible) as it could actually be an issue with the circuitry driving the meter on that side - rather than the meter itself.

Are there trimpots to calibrate the meters in the unit?
 
Hi,

Repairing meters is a specialist job, it is very easy to damage a meter movement if you attempt a repair. I had a BA2000 in for repair a while ago, and one meter wasn't working. See this thread

http://audiokarma.org/forums/index.php?threads/ba-2000-on-the-bench.694143/#post-9279963

It is likely that one of the hair springs has broken away from its connection point.

See post 4 in the above thread re a specialist meter repairer in the US (I sent the meter all the way from Australia to the US for repair).

Cheers

John
 
Hi,

Repairing meters is a specialist job, it is very easy to damage a meter movement if you attempt a repair. I had a BA2000 in for repair a while ago, and one meter wasn't working. See this thread

http://audiokarma.org/forums/index.php?threads/ba-2000-on-the-bench.694143/#post-9279963

It is likely that one of the hair springs has broken away from its connection point.

See post 4 in the above thread re a specialist meter repairer in the US (I sent the meter all the way from Australia to the US for repair).

Cheers

John
I agree that repairing a meter that is "open" in an ohms test, but free movement is a tricky job typically best done by someone that has done this kind of work before. Its very easy to further damage the hair springs that make them unusable.
 
If you're lucky a hairspring spring may have broken off at the outer end. Someone with watch/clock repair skills would be able to form a new hook and solder it back. It's tricky... Otherwise it's as the advice above.
 
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