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Technics SP-10 Gallery and information page

Technics SP10, SP10mkII and mkIII

Trop_sp10_5.jpg (244733 bytes) Troporobo's SP 10  ( PI )

PF SP10_2.jpg (342465 bytes) Peter F...... SP10 mkII (Australia)

KMsp10mkIII_1.jpg (272942 bytes) Ken McCarty's sp-10 mkIII (USA)

user 510's sp-10 mkII (USA)

 

 

data, articles, notes and links:

webmaster'

webmaster

Mounting Templates:

sp10 mkII mtg. template   in pdf format )requires acrobat reader. (units are metric the dwg is not to scale)

Parts Lists:

Capacitors and trimmers to replace  (pdf)

ve_technics_sp10mkii_drive.jpg (288041 bytes) mkII drive circuit diagram

ve_technics_sp10mkii_logic.jpg (288408 bytes) mkII logic circuit diagram

 

links:

http://www.vinylengine.com/library/technics/sp10.shtml

 

Articles & brochures:

techtest.JPG (334638 bytes)

techmod1.JPG (315593 bytes) techmod2.JPG (431050 bytes) techmod3.JPG (138310 bytes) techmod4.JPG (406844 bytes)

Thanks to Ken Mccarty for the above article scans.

Notes:

Notes on the speed regulation:

Thanks to The Vinyl Engine, we have access to good copies of the service manual to assist (heavily) in this project. I'll try to paraphrase and condense the explanation of the various circuits that regulate platter speed on this interesting little record player.

1) First there is quartz oscillator that generates a reference signal. The reference signal is split by a frequency divider into the appropriate frequency for each of the three available speeds. And this speed information is stored in digital memory.

2) There is a strobe logic circuit that is used to flash the neon strobe bulb.

3) Frequency Generator.
It says that the Frequency Generator is integrated with the platter drive motor and converts platter rotation speed into a frequency. And the output of this frequency is fed to the speed and phase control circuits.

4) Phase Control Circuit
The phase control circuit detects phase difference between a reference signal (see item #1) and the frequency generator signal (item #3) and generates a control voltage. So between the reference signal, the frequency generator and the phase control circuit the rotation of the platter is "locked" to the reference signal.

5) Speed Control Circuit
Here it describes a "sample hold" circuit that converts output of the frequency generator into an electrical voltage. This is the control voltage which maintains platter rotation speed.

(Btw, we already knew that the motor was brushless DC, right?! DC motors are speed-controlled by voltage. More volts = more rpms....more or less.)

6) Drive Circuit
Here I just quote the service manual.

"Two control signals are composed and applied to the drive circuit to maintain a forward motor rotation. The drive circuit supplies full wave drive current doubling current efficiency. It supplies drive current in both directions for a symmetrical rotation in either a forward or reverse direction."

7) Start/stop Circuit
Hit the on button and the circuit starts the platter rotation. hit it again and a reverse drive plus mechanical brake is applied.

8) Mechanical Brake Actuating Circuit.
Here it describes a circuit that operates a solenoid that pushes a brake shoe against the platter. And this is working together with the above noted start/stop circuit. There's more but you get the idea.

There you go. Tech-geek translated into English courtesy of The Analog Dept.