Technics Repair Guide - no power (transistor replacement)

Описание: Technics SL1200 / SL1210 MK2 "no power" Repair Guide.

Always check your power chord and the fuses before replacing anything!!! Also ground yourself or use a grounding bracelet before touching the components and never forget to unplug everything when you open it up!!!

Background music made by: Mr. Zodiac

ISSUE: No power due to Needle light short circuit. The fuses did NOT blow and the power chord was plugged in when it shorted. (It would also work when your leds are dimming when use the device or wobbly erratic platter spinning, however these last errors would require some more

In most cases it's sufficient to replace transistors Q2 & Q3 on the mainboard. It's a relatively easy fix. You need 2x transistor 2SD637R or 2SD637 for this.

The needle light stopped working on one of my decks. As I tried to push it in and out a few times the deck suddenly stopped working completely, no more power. I searched the net for a solution and came up with replacing transistors Q2 and Q3 on the mainboard. There are a few other parts that need to be checked if this fix doesn't work for you (see EXTRA).

EXTRA:
If the above fix did not work for you or you have erratic platter movement or dim lights, also replace Q1 (2SC1846) (this is the loose big transistor attached to the inner deck for cooling. If that still doesn't work, replace Q201 (2SD1265) and diode D3 (MA1051M). I was in luck Q2 and Q3 were all I needed to replace. Cost me about 2 euro's in parts and 30 mins of time. The needle light still needs to be fixed, I am waiting for those parts and will create a video for that part soon.


Q1 Q2 Q3 Q201 D3 repair mainboard disassemble technics sl1200 sl1210 mk2 mkII no power MA1051M 2SC1846 2SD1265 2SD637