Remember the fact that those capacitors are polarized (one aspect certain and one unfavourable), and also you should set up the brand new ones in the proper orientation. Caps typically have a white stripe operating down the aspect pointing to the “unfavourable” ( — ) lead. Ensure that the alternative caps are orientated the similar means because the originals. Once in a while the certain (+) aspect is marked at the PCB to your comfort, however now not all the time. Thankfully, at the Lingo board, all of the radial caps are orientated the similar means (unfavourable leads all to one aspect of the board) and the three axial caps are all orientated the wrong way.
Solder within the new caps!
As soon as performed, it’s all the time excellent to do a cautious visible inspection of your paintings to make sure that all of the capacitors are proper, the orientations are proper, and the solder joints are excellent and safe with out a damaged lines.
Step 3: Test/calibrate the output voltage
The best way this energy provide works is that it generates two units (levels) of sine-wave alerts, offset from every different moderately, which drives the AC motor within the turntable. The Lingo makes use of the next startup voltage to get extra torque, after which settles into the regular voltage to run the motor. The regular voltage as measured at the board will have to be 60V for every of the two levels, and after changing the capacitors, you will have to test that this output continues to be nominal, and modify it if it’s now not.
⚠️ What follows comes to powering up the Lingo with the case open, and probing a reside circuit. This doubtlessly exposes you to mains or upper voltages, which will injure or kill. Don’t do that when you’re now not at ease with how you can do it safely. You’ll reassemble the Lingo with out checking the voltage and it is going to virtually no doubt paintings simply fantastic anyway. Don’t take needless dangers.
Sooner than doing this, you should exchange board again into the sled. Observe the sooner steps in opposite: decrease the board again in, reattach the ability plug to the board and exchange the six screws that dangle it down, in addition to the one screw underneath the sled that is going into the middle of the toroidal transformer. You don’t wish to exchange the entrance panel.
Attach the Lingo on your LP12; you need to take measurements whilst it’s in truth riding a motor. (The way to set up a Lingo’s inboard meeting within the LP12 is past the scope of this newsletter however quite a lot of explanations of that may be discovered.)
When you’ve got an isolation transformer in your workbench, now is a brilliant time to make use of it!
It’s most secure to clip the voltmeter results in the board prior to energizing it in any respect. Set your voltmeter to AC volts, and clip the unfavourable (black) result in the unfavourable leg of C3 (the axial capacitor that’s on its own). Clip the certain (crimson) result in the unfavourable leg of C20 (which is one of the two sign levels):
Together with your palms out of the case and eye coverage on, plug within the mains and moderately transfer at the Lingo’s pushbutton energy transfer.
Not anything will have to smoke or odor or make bizarre sounds or explode! Put on eye coverage.
Flip at the motor the use of the transfer at the LP12. It will have to get started spinning! If at this level, the motor isn’t turning, one thing is incorrect. Both with the capacitor alternative you’ve performed, or one thing else.
Assuming the deck seems to be operating OK, give it a while (a minute or so) to settle in and make further positive not anything turns out incorrect.
Be aware that the Lingo’s preliminary output is what Linn calls a “stall mode” at the next voltage (round 90V) to get the platter to hurry briefly. Wait a minimum of 10 seconds or so after startup prior to taking any of the measurements underneath. You’re concerned about the steady-state voltages.
Test the voltage at the voltmeter. It will have to be 60V or inside of 1V of that. No adjustment could also be vital in any respect! On the other hand when you see a studying underneath 59V, or above 61V: very gently and very slowly, with an insulated screw driving force, modify the small screw-turn-component classified POT1 (helpfully additionally marked 33rpm) till it’s in vary.
Flip the entirety off, transfer the certain probe to the unfavourable leg of C21 to test the opposite segment, and repeat. Each levels will have to be in vary as each are managed by way of POT1.
After all repeat the above steps, however with 45rpm decided on at the LP12. You’re nonetheless on the lookout for 60V right here (it’s the frequency of the sign that adjustments, now not the voltage), and this voltage is adjusted with POT2 if vital.
NOTE: 45rpm mode is not going to correctly interact except the motor is put in in an LP12 with the platter weight on. If for some reason why you’re checking out with a naked unmounted motor, you gained’t be capable to transfer to 45rpm. That.
Step 4: Shut it again up
Exchange the ability transfer meeting with its screws after which exchange the entrance panel when you got rid of it. Make sure that the ability LED is coated up lovely smartly with the plastic tube that relays the sunshine. Slide the outer case again on and safe it from the bottom with the four screws.
Congratulations, you simply totally serviced a Lingo! I really like to place a bit decal at the within or backside of the case indicating the date of the recap in order that you, or a long term proprietor, could have a file at hand of its closing carrier.
I am hoping you discovered this information at hand. For those who came upon any mistakes, or certainly when you didn’t however it used to be useful, please be at liberty to drop me an electronic mail at (my Medium account identify) at Gmail.com. Textual content pictures above are copyright 2020 by way of Ben Zotto and can’t be reproduced with out permission. Now revel in that vinyl in taste!