Technics sl7 turntable

[arthurt]

The size control switch operator is broken, can anyone please tell me which of the contacts q303, q304 q305 that i need to link out to put the selector in the auto position.

Thanks

Arthur

 

[Galu]

I've provided a link to the service manual.

Block 2 shows the contacts you mention Arthur.

Hopefully, an SL-7 expert will come along with a solution!

https://www.google.com/url?sa=t&rct=j&q=&esrc=s&source=web&cd=1&ved=2ahUKEwjpo-iJ4drlAhVdRBUIHTI3DZEQFjAAegQIARAC&url=https%3A%2F%2Fwww.vintageshifi.com%2Frepertoire-pdf%2Fpdf%2Ftelecharge.php%3Fpdf%3DTechnics-SL-7-Service-Manual.pdf&usg=AOvVaw3NvLOhehOSP0gkdhDeS3jB

 

[Galu]

P.S. Note to moderators: Arthur's thread should be transferred to the Analog Source section.

 

[arthurt]

Thank you for the information Galu, I hope someone with the knowledge can help me?

 

[Galu]

Sadly, no responses Arthur!

I suggest you start a new thread under the heading "Technics SL-7 record size detection" in the 'Analog Source' section of the forum, where it should get noticed by the turntable experts.

 

[arthurt]

Thank you I will do as suggested

 

[JonSnell Electronic]

Pins B12, B11 and B10 state the record size.
If playing a 7" B10 only is high, a 10" and both B11 and B10 are high and for a 12" all three are high.
S306 and S307 detect the position where the stylus is raised or lowered, if that is what you mean, those microswitches are readily available from RS components, Mouser and even fleabay.


PS I olny noticed this question as it is listed under Tubes!