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Old 24th November 2005, 11:35 PM   #1
tdiman is offline tdiman  United Kingdom
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Question technics 1210 problem

I've got a problem with one of my technics 1210.

I changed the pop-up lamp to an LED, however, I've damaged the circuit in doing so.

the strobe lights dont work, the platter wont spin and when I press 45rpm button it only lights when I hold it down, when I let go 33rpm come on again. the pop up LED and pitch are working fine.

I've replaced Q2 and Q3, I also replaced D1 with not the exact same part but an equivalent (higher voltage) rectifier diode, but this has made no difference.

what else should I change ?
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Old 25th November 2005, 08:06 AM   #2
Netlist is offline Netlist  Belgium
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The lamp is directly connected to +B, 20V. You will need a series resistor to connect a LED to it.
I suggest you take the LED out of circuit and check Q1.
Check D2 if present, a 5.1V zener connected to the emitter of Q3 but ommited in newer decks.

/Hugo
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Old 25th November 2005, 04:35 PM   #3
tdiman is offline tdiman  United Kingdom
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yes I have series resistor connected to LED. the pop-up LED now works fine, but something else is broken.

there is no D2 on my circuit. I have changed Q2 and Q3, then D1, still not working though !
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Old 25th November 2005, 04:50 PM   #4
Netlist is offline Netlist  Belgium
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Do check/replace Q1. That is the TO220 transistor located on top, off-board. Look if you have 20VDC at it's emitter or before the LED's series resistor.

/Hugo
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