Finally, the Kenwood L-07D I have been restoring is repaired and working perfectly.
I completed a very thorough overhaul and restoration on the deck after it arrived not functioning correctly. The platter was over-speeding and there were other operational malfunctions.
I decided that it would be a great project to restore this beautiful piece of equipment. The deck had a number of issues, but was cosmetically perfect – a good subject for an overhaul and restoration.
I serviced the main bearing and after cleaning out the bearing well, used about 0.25mL of synthetic bearing oil in the clean assembly. After cleaning the chassis and tightening all nuts bolts and fasteners, I overhauled the arm and arm base mechanism. This involved stripping, cleaning and re-greasing the arm securing mechanism and lift gears.
The final stage of the service was to restore the electronic control unit which was where the operational problem was situated. This involved the replacement of electrolytic capacitors and other film caps with new, high spec parts.
I then trouble-shot the circuit and found the issue to lie in three integrated circuits on the control/logic board. I replaced the ICs, cleaned all the connectors and disassembled and cleaned the control umbilical connector. I also cleaned the circuit boards and, as part of the reliability enhancement, I replaced trim-pots with high-spec Bourns parts to ensure trouble-free long-term performance.
The deck now works perfectly again and sounds superb, as one would expect of this highly regarded pinnacle of direct drive technology. The deck is dead-quiet, with a vast sound-stage, instruments and singers locked in space. Bass is epic – taut, clean and deep. Distortion is vanishingly low.
This is a gem of a deck, and if you get a chance to own one I would wholeheartedly recommend it.