Technics SP-10 speed problems

[Stefanoo]

Hello to everybody,


I have a SP10 first version (no external psu) and i am unable to regulate the speed of the 33rpm and I track through the stroboscope a little drifting on the 45rpm's mode.

I was wondering if there is any way to get a service manual for this turntable or anybody with any kind of experience with this table would like to share some hints with me.

Thank you very much for all the attention paid.

[MJR]

First check for 15v power supply output (check on C7 terminals). Both speeds are controlled via VR3/VR1 (33) and VR4/VR2 (45). Check these for correct value (1K and 5K) over their operating range and also check resistors R9 (18K) and R10 (15K). There should be 14.4v at the junction of R9 and R10 (also base of TR3). Check also C13, C15 and C16 for ESR if possible.

[Shaun]

Technics SP10 manuals

You may have to join the forum to get access to the library, but it's all there.

The most common problem with the SP10 is that the electrolytic capacitors in the power supply become aged, and inevitably require replacement.

[Stefanoo]

thank you for the link.
I am going to register on the website.
Appereantly It looks to me that the manuals you pointed out are for the MKII version and i do only have the first version.