Posts by marcham
63 total posts55 results
B&O Azimuth Calibration Tape and More (Beocord 9000 Accessories Box)
in For Sale · Jul 8, 2026 03:01Hey, all! I'm downsizing a bit of my collection and thought some of you might be interested. I'm selling an the original B&O accessory box bundle that came with the Beocord 9000. It includes an official B&O B&O Azimuth C…
Beovox S75 tweeter 2 needed!
in Wanted · May 1, 2025 04:55Dante Totino wrote: for anyone with the same issue I found a suitable replacement from a great little shop in the midwest. MW Audio MT-4115: 1 inch Dome Tweeter: https://www.midwestspeakerrepair.com/product/mw-audio-mt-4…
Question About Beogram 8002 Recapping
in BeoGram · Mar 15, 2025 04:25Hey, Glitch. Yep, I'm stubborn and refuse to put this machine down. 😅 Checked out the display strobe pins on the scope, and don't get anything besides a flat 5V signal. The issue with -15V rail was down to a bad TR19. I…
Question About Beogram 8002 Recapping
in BeoGram · Mar 14, 2025 03:54Evening, all. I was able to track down the issue for my last problem and now have my +15V, -15V, and +5V rails. 👍 However, I still have problems with the unit and suspect the CPU. Current problems include a constantly s…
Question About Beogram 8002 Recapping
in BeoGram · Feb 26, 2025 04:13Hey, all. Thanks for sticking with me on this multi-month journey; I've been learning more than you can imagine. The good news is that I finally have a standby light after solving some communication issues between the PC…
Question About Beogram 8002 Recapping
in BeoGram · Feb 14, 2025 00:31Thanks, Mark! Someone on Reddit had suggested this as a replacement, so I'll grab a few new connectors and clips. https://www.digikey.com/en/products/detail/molex/0022012121/1090462 https://www.digikey.com/en/products/de…
Question About Beogram 8002 Recapping
in BeoGram · Feb 11, 2025 22:51Bit of an update. After wondering why my progress regressed, I decided to go through and test the basics (aka power). I found that the 15V line wasn't producing voltage and quickly traced it back to a loose connection on…
Question About Beogram 8002 Recapping
in BeoGram · Feb 8, 2025 01:24Hey, all. Replaced TR17, but nothing changed. To confirm the current situation, the display shows four dots and pressing 'Start' displays '33,' but nothing starts up. Also, to double check, should the state of each keybo…
Question About Beogram 8002 Recapping
in BeoGram · Feb 7, 2025 02:19Hey Dillen. Thanks, appreciated! I'll have to research my understanding of transistors, as I thought TR17 looked good. I thought that if the B was powered (5V), C and E should be open with the same voltage (6V). I ordere…
Question About Beogram 8002 Recapping
in BeoGram · Feb 5, 2025 03:53Hey, all! The swap of 01C1 was successful in moving forward the repair. Everything receives the correct power: 5V, 15V, and -15V. However, the unit doesn't want to start up properly. After experimenting, I found that the…
Question About Beogram 8002 Recapping
in BeoGram · Jan 22, 2025 22:01Understood, replacing it. Thank you, Dillen! I will report back once the replacement part has arrived and been installed. If you have a moment for me to learn, why this recommendation? In my beginner's eyes, it appears 0…
Question About Beogram 8002 Recapping
in BeoGram · Jan 22, 2025 03:22Thanks for clarifying, Dillen. These readings were taken in the standby state. Here is how the states change between standby on/off: Standby : E:20V, B:14V, C:14V On : E:20V, B:13V, C:13V I should note, the platter spinn…
Question About Beogram 8002 Recapping
in BeoGram · Jan 18, 2025 05:08Hey Martin, I really appreciate the response. Let me know if I'm misunderstanding your suggestion, but the 15V rail seems to work perfectly; it's only the -15V that is MIA. Here is a copy of the circuit readings I previo…
Question About Beogram 8002 Recapping
in BeoGram · Jan 17, 2025 04:30I'm adding more information in the hope that someone can help me with the missing -15V rail. Three lines leading away from the power section, near TR21, are 00, DD, and II. Tracing down II leads to the CPU outputting eit…
Question About Beogram 8002 Recapping
in BeoGram · Jan 4, 2025 23:21Just popping in with an update. Still at the same point but been poking around the board and reading voltages. I noticed that the main chip's voltage on pin #38 (on/off) swaps between 0V and 2.5V. However, the chip seems…
Question About Beogram 8002 Recapping
in BeoGram · Dec 27, 2024 06:57Hey Glitch, Thanks for the explanation; that makes sense. Looking into TR21, the signal sits at .71V in standby and drops to .08V when switched on with the tonearm in motion. All readings in the diagram were taken in sta…
Question About Beogram 8002 Recapping
in BeoGram · Dec 26, 2024 19:35Afternoon, all. Hope everyone is having a good holiday. I had the time to dive in and take more voltage readings. As someone who doesn't know exactly how a circuit flips a voltage from 15V to -15V, I would say that somet…
Question About Beogram 8002 Recapping
in BeoGram · Dec 19, 2024 05:08Thanks for the info, Glitch. Checking at TR21, there is no voltage when the Beogram is on or off. If I check pin 38 of the CPU, the voltage is 2.5V when off and 0V when switched on. I can confirm that 5V is making it to …
Question About Beogram 8002 Recapping
in BeoGram · Dec 15, 2024 05:55Hey, Glitch (and others), It has been a while since I popped into this thread, as I've had some of my projects on hold. I was waiting on parts for the Beogram and then had to solve an issue with the ribbon cable connecti…
Beomaster 800 burning out R225? Insight welcome.
in BeoMaster · Dec 1, 2024 01:29Evening, all. I am currently working on a Beomaster 8000 and looking for a bit of advice. So far, the repair has been going well, and I have recapped everything; this worked well to solve an issue on the power supply boa…