Help me identify this part and find a replacement?

[JGAN]

Hey guys,
The selector dial on my stereo receiver was malfunctioning, and I need to find a replacement part. I think it is either a rotary switch or rotary encoder, made by Mahsushita (now Panasonic). The only other markings on it are "012" and below it "12B" but I have not been able to find a datasheet on it. The base is about 15mm on each side, and the dial itself has one flat edge and a diameter of about 5.95mm. Also, it has no stop and turns infinitely.

Here are some pictures and the schematic symbol also: ImageShack Album - 5 images

Anybody know for sure what it is and what a suitable replacement part would be?

Thanks,
JGAN

[JGAN]

Actually I just opened the case and it is a rotary switch, not encoder (there is no PCB). How do I determine how many ways, poles, and positions it has to find a suitable replacement?

[yajnaS]

Have you googled for a service manual for your receiver ? (for the BOM in it)

It has to be an encoder otherwise the receiver has no way of knowing if you're rotating it clockwise or CCW.

[Mooly]

You'll have to do a bit of research but a quick search turned these up,
Incremental | CPC | Results

[JGAN]

Originally Posted by yajnaS

Have you googled for a service manual for your receiver ? (for the BOM in it)

It has to be an encoder otherwise the receiver has no way of knowing if you're rotating it clockwise or CCW.

Ok, I think you're right. Most likely an incremental rotary encoder?

[JGAN]

Also, it is not in the service manual. And I can't find any 4 pin rotary encoders.