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Old 3rd May 2005, 09:13 PM   #1
tdiman is offline tdiman  United Kingdom
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Exclamation Technics 1210 DC Power Problem!!

I was trying to replace the Cue lamp on my technics 1210 mk2 and I accidentally shorted the cue lamp 20v DC wires. Everything went dead.

There is now no DC power, all LEDs are off and the deck wont work. I have checked with a voltmeter and there is still AC 240 and 30volts coming through. I think the DC regulator circuit is gone.

Any idea of what components I need to replace to get it working again ??


thanks
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Old 3rd May 2005, 09:20 PM   #2
Netlist is offline Netlist  Belgium
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Do you mean the Stylus illuminator?
Check the fuse(s), Q1 which is the transistor mounted on the chassis above the motor and left from the power transformer.

/Hugo
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Old 3rd May 2005, 09:46 PM   #3
tdiman is offline tdiman  United Kingdom
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yes I mean stylus illuminator.

the 2 fuses I can see beside where the AC power comes in are not blown. Is there any more fuses?

How can I check if Q1 is ok, should this output DC ?
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Old 4th May 2005, 07:21 AM   #4
Netlist is offline Netlist  Belgium
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Did you measure the fuses out of circuit?
Q1 has a little PCB attached with 3 wires.
With respect to ground you should measure 35VDC at the orange wire, 21.9VDC at the yellow one and 21.3VDC at the red one.
The stylus illuminator is directly connected to the 21.3VDC.
Ground can be taken at one of the screws that hold the big PCB in place.

Oh, and please disconnect the mains before taking parts out.

/Hugo
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Old 5th May 2005, 06:42 AM   #5
tdiman is offline tdiman  United Kingdom
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OK, I measured the voltages at Q1.

44volts on the orange wire and nothing on the yellow and red, I take it Q1 is blown then ??
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Old 5th May 2005, 07:02 AM   #6
Netlist is offline Netlist  Belgium
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Very probably Q1 is open circuit.
Is it 2SD389?

/Hugo
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Old 5th May 2005, 10:59 AM   #7
tdiman is offline tdiman  United Kingdom
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hi,

Q1 is a 2SD1265 in my turntable.

I will order one of these up and replace it.
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Old 12th May 2005, 12:00 AM   #8
burbeck is offline burbeck  United Kingdom
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hi
if that does not cure the problem try Q2 and Q3 (2SD637) very likely
regards
bob
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regards
bob
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Old 27th March 2011, 01:53 PM   #9
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Default I have no power to 1200 MK2

Hi mate did u have any luck?, im 16 and tryed changing the target lights, and the wires accidently touched when i tested before i put heat shrink on and I have no power to my technics, and not sure where the fuses are and how to test them? and suggestions
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