Leicht.IO | Atom FeedLeicht.IO Atom Feedhttps://leicht.io/atom.php2026-10-15T13:08:40+00:00Servo motor replacement for the Beogram 4000 serieshttps://leicht.io/articles/servo-motor-replacement-for-the-beogram-4000-series2021-11-16T13:31:00+00:00Christian Leichtchristian@leicht.ioThe servo motor in the Beogram 4000 series isn't as prone to wear as the DC platter motor but occasionally I come across some noisy and unstable ones. They are hard to restore since it's impossible to take the Oilite bearings out. They are fused...3D Printed Bumper Feet for BG400X/6000https://leicht.io/articles/3d-printed-bumper-feet-for-bg400x-60002019-04-25T12:22:00+00:00Christian Leichtchristian@leicht.ioSo, it’s been a while since my last post. We’ve moved to another city in Denmark. I’ve been using some time to set up a proper work environment in my new office with room for my PC, 3D printer and BeoRep utilities (oscilloscope, better lighting for my...Restoring a pair of Beovox MC120.2https://leicht.io/articles/restoring-a-pair-of-beovox-mc12022019-10-29T16:06:00+00:00Christian Leichtchristian@leicht.ioLast year, I finally found a pair of Beovox MC120.2, which would replace my Beovox S55. Luckily, the MC120.2 was in rosewood, which matched my Beogram 4002 perfectly! Of course, the MC120.2 needed a restoration involving refoaming the woofers and...BeoTac, a tachometer for the Beogram 4000 serieshttps://leicht.io/articles/beotac-a-tachometer-for-the-beogram-4000-series2020-04-02T06:58:00+00:00Christian Leichtchristian@leicht.ioThis article aims at describing the process of developing and implementing an Arduino-based tachometer. This should make it possible to measure the performance and stability of the motor in a Beogram 4000 series turntable.Restoring the charger for the BeoLink 7000https://leicht.io/articles/restoring-the-charger-for-the-beolink-70002022-10-24T12:11:00+00:00Christian Leichtchristian@leicht.ioThis short article aims at showing you how to service a Bang & Olufsen BeoLink 7000 table charger. There are only a few passive components which need to be replaced. To open it you will have to remove the 3 screws accessible from the bottom.The red...Restoring a pair of RedLine 45 with ABRhttps://leicht.io/articles/restoring-a-pair-of-redline-45-with-abr2022-10-05T07:09:00+00:00Christian Leichtchristian@leicht.ioIf the bass in your RedLine ABR speakers is off it's most likely that the ABR suspension is completely degraded. This article covers a full restoration of a pair of S45. First of all, lay the speaker down on a flat surface and start by removing the 6...A new and improved dust lid for the Beogram 4000 serieshttps://leicht.io/articles/a-new-and-improved-dust-lid-for-the-beogram-4000-series2020-03-31T15:09:00+00:00Christian Leichtchristian@leicht.io
The Beogram 4000 series often faces issues with its acrylic dust lids, especially around the hinges, due to wear over 50 years. I'm considering crafting replacements from polycarbonate, which is stronger, lighter, and more scratch-resistant, with better UV protection. I've created an accurate 3D model, but tooling costs about $18000. Orders start at $191 each for a minimum of 100 units, with prices decreasing for larger quantities. Colors include the original brown and a grey-smoke variant. Interested?Adjusting and lubricating the BeoGram 7000https://leicht.io/articles/restoring-the-beogram-7000-adjusting-the-turntable2021-06-15T12:34:00+00:00Christian Leichtchristian@leicht.ioAfter the electronics, the BeoGram 7000 gets new belts, fresh lubrication and a full adjustment to the service manual.When a new backlight foil doesn't fix a BeoLink 7000https://leicht.io/articles/troubleshooting-a-beolink-7000-with-faulty-backlight2023-09-27T12:15:00+00:00Christian Leichtchristian@leicht.ioA BeoLink 7000 still had no backlight after I fitted a new EL foil. The cause turned out to be a failed transistor in the backlight oscillator.Cleaning and lubricating the BeoLink 7000https://leicht.io/articles/cleaning-and-lubricating-the-beolink-70002023-10-23T12:16:00+00:00Christian Leichtchristian@leicht.ioThe display lift in the BeoLink 7000 runs on a small belt, gears and a guide rail. I clean and relubricate the mechanism, fit a new belt and replace the capacitors and fuse on PCB01.Adjusting the speed on a BeoGram 6500https://leicht.io/articles/adjusting-the-speed-on-a-beogram-65002022-12-30T13:12:00+00:00Christian Leichtchristian@leicht.ioAfter the capacitors, belts and lubrication, I measure the speed over a long run. This BeoGram 6500 ran at 31 and 43 RPM until it was adjusted.Restoring the SN17https://leicht.io/articles/restoring-the-sn172022-10-05T12:10:00+00:00Christian Leichtchristian@leicht.ioLast week, my beloved SN17 decided to stop working without any notice, so it was time to open it up and check what happened. A simple inspection revealed that the main fuse (S1) was blown. The most common cause for a blown fuse is when something...Updates to BeoTachttps://leicht.io/articles/updates-to-beotac2022-03-25T13:29:00+00:00Christian Leichtchristian@leicht.ioOne of the important matters when 3D printing is to minimize the print time, so I've optimized the layout of the BeoTac which reduces the print time by ~45 minutes. The result is a good looking BeoTac with softer edges.You can see the previous design...Sledge motorhttps://leicht.io/articles/replacement-sledge-motor-for-the-beogram-40002023-12-26T13:17:00+00:00Christian Leichtchristian@leicht.ioThe original sledge motors in the BeoGram 4000 series can get noisy and unstable, and their bearings can't be serviced. I replace them with a modern Portescap motor, with a Maxon motor as the alternative.Regluing the glass front on the BeoLink 7000https://leicht.io/articles/securing-glass-front-beolink-70002024-07-26T17:23:29+00:00Christian Leichtchristian@leicht.ioNow and then the adhesive between the glass front and its plastic frame starts to let go on a BeoLink 7000. As long as it hasn't come off completely, a syringe of thin superglue fixes it.Relay replacementhttps://leicht.io/articles/beogram-400x-relay-replacements2019-06-20T12:27:00+00:00Christian Leichtchristian@leicht.ioThe original relays in the BeoGram 4000 series wear out with age. I replace them with my own relay PCBs, built around modern Omron relays.RIAA preamphttps://leicht.io/articles/beogram-4002-riaa2026-02-16T16:58:02+00:00Christian Leichtchristian@leicht.ioA new RIAA preamp for the BeoGram 4002, built around the OPA2134 in the same form factor as the original board. The second SMD prototype is built and tested.Reservoir capacitor PCB for the BeoGram 4002https://leicht.io/articles/bg4002-pcb-adapter-for-reservoir-capacitors2023-12-04T13:16:00+00:00Christian Leichtchristian@leicht.ioThe BeoGram 4002 type 5513 uses a dual reservoir capacitor that is no longer available. I replace it with two new capacitors on a PCB with a bleeder resistor and a discharge LED.Tonearm Lift for Beogram 1000https://leicht.io/articles/tonearm-lift-for-beogram-10002019-07-21T12:29:00+00:00Christian Leichtchristian@leicht.ioLast month, I had an old Beogram 1000 in teak for restoration. As usual, the handle/lift (what's the correct term?) for the tonearm was missing. It's only glued to the tonearm and the glue happens to lose its strength over the years.3D Printed B&O SP12/14 Pickup Hoodhttps://leicht.io/articles/3d-printed-bo-sp12-14-pickup-hood2019-05-15T12:26:00+00:00Christian Leichtchristian@leicht.ioI was tired of the always missing protection cap for the Bang & Olufsen SP12/14 pickups and the constant concern that the cantilever or diamond would be damaged when just laying around.I recently bought a Creality Ender 3 3D Printer and equipped...Restoring the BeoLink 7000 floor chargerhttps://leicht.io/articles/restoring-the-beolink-7000-floor-charger2022-11-25T13:11:00+00:00Christian Leichtchristian@leicht.ioAs with all other electronics containing passive components, the floor charger for the BeoLink 7000 must be restored as well. Luckily this is a somewhat easy task since there are only three capacitors to change. This article aims to show how and which...3D Printed Sledge Pulley for Beogram 400X/6000https://leicht.io/articles/3d-printed-sledge-pulley-for-beogram-400x-60002019-07-21T12:28:00+00:00Christian Leichtchristian@leicht.ioAs usual, the sledge pulley has small cracks or even falls apart when disassembling the turntable. That was also the case for the Beogram 4002 I'm restoring right now. And as a precaution, I decided to change it. Equipped with Tinkercad and my beloved...Stainless steel top platehttps://leicht.io/articles/restoring-beolink-7000-new-steel-top-plate-replacement2025-10-25T15:11:01+00:00Christian Leichtchristian@leicht.ioThe top plate on the BeoLink 7000 is almost always scratched or dented. I replace it with a new plate in mirror polished stainless steel.Mounting bracketshttps://leicht.io/articles/new-mounting-brackets-for-the-beogram-30002024-08-06T16:42:39+00:00Christian Leichtchristian@leicht.ioThe plastic mounting brackets on the early BeoGram 3000 often break. I replace them with brackets of my own design, made in polypropylene.Piezo elementhttps://leicht.io/articles/replacing-piezoelectric-element-bl70002024-07-26T11:12:06+00:00Christian Leichtchristian@leicht.ioTapping the top plate wakes the BeoLink 7000, thanks to a small piezo element underneath. When that stops working, the piezo has usually failed with age, and I replace it.LED tracking sensorhttps://leicht.io/articles/replacing-the-light-bulb-tracking-sensor-on-the-bg40022019-07-26T12:30:00+00:00Christian Leichtchristian@leicht.ioThe BeoGram 4002 tracks the groove with an optical sensor lit by an incandescent bulb that dims with age. I replace it with a calibrated LED on a small PCB.LED RPM adjustment lightshttps://leicht.io/articles/replacing-the-incandescent-light-bulbs2019-09-12T14:53:00+00:00Christian Leichtchristian@leicht.ioThe bulbs behind the 33 and 45 rpm scales on the BeoGram 4002 and 4004 panel have usually burnt out after more than 40 years. I replace them with a warm white LED PCB of my own design.Restoring the keypad and chassis on a BeoGram 4002https://leicht.io/articles/restoring-the-keypad-and-chassis-on-a-beogram-40022019-12-30T16:07:00+00:00Christian Leichtchristian@leicht.ioDecades of use wear through the varnish and black paint on the BeoGram 4002 keypad. I strip it, have it professionally painted and refit it to the chassis.Speed testing with SpinDexhttps://leicht.io/articles/speed-testing-with-spindex2026-10-14T18:53:38+00:00Christian Leichtchristian@leicht.ioEvery BeoGram 400X I restore is speed tested with SpinDex, an open source RPM logger I designed for the BeoGram 4000 series.Replacing the electronic components in the BeoGram 7000https://leicht.io/articles/restoring-the-beogram-7000-changing-the-electronic-components2021-06-15T12:34:00+00:00Christian Leichtchristian@leicht.ioThe electrolytic capacitors in the BeoGram 7000 and its 59xx siblings have reached the end of their life. I replace them on the control board, power supply and motor board, along with the rectifier diodes.Replacing the batteries in the BeoLink 7000https://leicht.io/articles/replacing-the-cmos-battery-on-the-beolink-70002023-03-15T13:13:00+00:00Christian Leichtchristian@leicht.ioThe BeoLink 7000 has two batteries, the main battery and a lithium coin cell that keeps its settings. Both are long past their life, so I replace both.Testing the BeoLink 7000https://leicht.io/articles/testing-the-beolink-70002023-03-19T13:14:00+00:00Christian Leichtchristian@leicht.ioThe BeoLink 7000 has a built in test program. I use it at the end of a restoration to check the keys, the display and the memory.Pickup mounthttps://leicht.io/articles/replacing-the-broken-pickup-mount-on-the-beogram-40002023-01-26T13:12:00+00:00Christian Leichtchristian@leicht.ioThe plastic tab in the BeoGram 4000 pickup mount can break with wear and age. I replace the mount with my own nylon part and flexible PCB.Backlighthttps://leicht.io/articles/replacing-the-backlight-on-a-beolink-70002022-07-08T14:49:00+00:00Christian Leichtchristian@leicht.ioA weak or dead backlight is the most common fault on the BeoLink 7000. The EL foil behind the display wears out, and I replace it with a new one.TPU straphttps://leicht.io/articles/reviving-your-beowatch-with-tpu2023-09-06T12:14:00+00:00Christian Leichtchristian@leicht.ioThe plastic inserts in the BeoWatch strap tend to crack and tear, and the steel plates get scratched. I've made replacements for both, flexible TPU inserts and laser cut stainless steel plates.