Posts by StanfordBeogram
26 total posts20 results
Beogram 4002/4004 RIAA/Remote control Upgrade :)
in BeoGram · Apr 9, 2024 19:47This is fantastic - and very well laid out. Would it be possible to design one to work with an independent IR sensor so that it may be solely used as with a Beolink remote? Please let me know how I may purchase on of the…
Beogram 400X (5513 and 5526) Transformer Output Questions
in BeoGram · Mar 31, 2024 08:52Hello everyone, Glad to be back working on Beograms after a long hiatus! I have both a Beogram 4002 and 4004 with bad transformers. Is anyone able to provide me what output voltages I should be expecting for both blue le…
Beogram 4004 (Type 5526) Issues
in BeoGram · Nov 4, 2022 03:39Hi Mark, I was able to find another BC143 transistor! I installed it and the Beogram works, but the "<" button does not work. For some reason, I cannot seem to find what part of the circuit is responsible for the "<" but…
Beogram 4000 Restoration Issue
in BeoGram · Nov 3, 2022 19:22Hi Craig, Martin, and chartz. Craig - the fuse did separate completely. I will order a couple of new ones along with a replacement of all the components (aside from the reed switches) of the voltage regulator circuit - m…
Beogram 4004 (Type 5526) Issues
in BeoGram · Nov 3, 2022 04:41Hi Mark, I am currently in the process of replacing all associated components in both the servo motor control and solenoid circuits. Upon inspecting TR-22, (the BC143 transistor)I found that it does not test properly and…
Beogram 4000 Restoration Issue
in BeoGram · Nov 3, 2022 04:34Hi Craig, Thank you for your post! I wasn't even aware that there was another fuse in that section. Upon inspection, it is obvious something got very hot - either the fuse or another component, my (safe) guess being the …
Beogram 4000 Restoration Issue
in BeoGram · Oct 30, 2022 01:49I have a Beogram 4000 (Typ. 5215) that I purchased for next to nothing at a local estate sale - my dream turntable! The power capacitors were leaking electrolytic fluid, so I did not even bother to attempt to power it on…
Beogram 4004 (Type 5526) Issues
in BeoGram · Oct 18, 2022 22:28Hi Martin, The white wires are being used as jumpers. The previous owner had no electronics and soldering experience. When replacing capacitors, he ripped up PCB wire hole tracks ?. The board with the Bang & Olufsen logo…
Beogram 4004 (Type 5526) Issues
in BeoGram · Oct 18, 2022 00:02I took your advice and started checking all the voltages and connections - once confirming that all of the white jumpers were correctly wired, I then decided to test all of the black transistors. TR-6, TR-17, and TR-19 (…
Beogram 4004 (Type 5526) Issues
in BeoGram · Oct 17, 2022 18:23Hi Mark, Is this the relevant section of the schematic with all the associated transistors?
Beogram 4004 (Type 5526) Issues
in BeoGram · Oct 16, 2022 03:49I have a Beogram 4004 (Type 5526). When pressing and holding “START” the carriage will immediately start (seems very fast) and move clear to the end of the slide transport and keep moving until it comes off the spindle. …
Beogram 4004 (Type 5526) issue
in BeoGram · Jul 27, 2022 21:29Hi Christian, The red wire is at the front of the Beogram, as you indicated it should be. The PCB with the 4 SMDs is one of the replacement power boards that I have developed. Ian
Beogram 4004 (Type 5526) issue
in BeoGram · Jul 27, 2022 21:29Hi Christian, The red wire is at the front of the turn table, as you indicated it should be. The PCB with the 4 SMDs is one of the replacement power boards that I have developed. Ian
Beogram 4004 (Type 5526) issue
in BeoGram · Jul 27, 2022 21:28Hi Mark-sf, Yes, the turn table is able to move the arm inward with the "<" key and does stay, without turning off.
Beogram 4004 (Type 5526) issue
in BeoGram · Jul 22, 2022 18:07Hi Mark, Update: TR-19, and IC2 were flipped. I reoriented them and now everything is working, except for “START”. I replaced TR8 on the muting board and applied fresh solder to D9/D10 on the muting board as well - any o…
Beogram 4004 (Type 5526) issue
in BeoGram · Jul 22, 2022 04:47Thank you both for the replies! I checked the fuses (both are good and were recently replaced). The voltage at the fuses was 123.5V AC. I then checked the DC voltage at P3 - 1 and 2. The voltage was 33.9 VDC I could not …
Beogram 4004 (Type 5526) issue
in BeoGram · Jul 21, 2022 04:12Hello! I have replaced all the relays of a Beogram 4004 (Typ. 5526) with new replacements. That said, I am still unable to start the Beogram with the "START" key - only starting by the "33" key. I have re-soldered and th…
Beogram 4002 (Typ 5523) and 4004 (Typ 5526) Questions
in General Discussion & Questions · Dec 7, 2021 19:12Thank you for your response - I am waiting to purchase a multimeter. I did do some basic elimination work. There is a ground issue on the 4004 (I am assuming) as the two fuses were blown. I checked each external connecti…
Beogram 4002 (Typ 5523) and 4004 (Typ 5526) Questions
in General Discussion & Questions · Dec 7, 2021 06:50Hello, I have two Beograms (one 4002 and on 4004). I went through each one, cleaned and lubricated the chassis and the tone arm lowering mechanism. Everything was working for both after this step. However, after removing…
Questions about Beogram 4002 and Beocenter 2300
in General Discussion & Questions · Oct 14, 2021 03:45Hello! I just joined the Beoworld forum and I am excited to say that I am finally in the position to expand my Bang & Olufsen collection! I recently acquired a fully restored and serviced Beogram 4002 and a Beocenter 230…