Yes, it sounds like it doesn't go completely off. There's a couple of diodes in that circuit and also a couple of electrolytic capacitors. Can you give me the emitter voltage of the first transistor 0TR1 in the "OFF" condition ? Martin

Unfortunately, there are lots of wrong size belts out there. The problem could be as simple as a too tight belt, it literally pulls the subchassis towards the motor, blocking the suspension. Martin

Alright so far. (I have a couple of good used 2N5034's in stock if you need). From the voltages, it seems that the transistor is commanded ON all the time. On to 1TR1 which is the driver, it has a fuse in the collector. Let's see the voltages on all three leads. Martin

If one belt is bad, the other(s) are probably also worth replacing while in there. Detailed mounting instructions with photos can be included with the belts, you only need to inform the model. Martin

Welcome to Beoworld ! The Beomaster 901 has a voltage setting switch underneath. Make sure to set it to 240 V and you should be home free with a suitable plug on the lead. The 250V marking on the plug is merely a "max rating". Martin

Not the Martin, you were addressing, I know, but regarding the BM8000, I think the weakest points are in the preamp. Newer opamp's are produced with far better specs and, as everywhere else, the caps in the preamp sections are getting old and would definitely need attention. I would focus on this rather than the actual amplifier stages, which are

I think so. As already stated, at present I don't have a Beogram of the type 5503 here but I have a found a photo of one and that transistor would be my guess. Check also that no wires are shorting to the transistor housing. Martin

The constant running platter motor is a sign that the 22.8V power supply is constant on but the sensor arm isn't lit because no start command was given. No stuck keys at the operator panel ? Check the 22.8V supply switching transistor, I don't have a Beogram of that exact type available right here but it's 0TR1 in your machine and it's

The two keys, you describe are filters. High-cut and low-cut originally there to remove high frequency "needle-noise" and rumble respectively though they will actually work on any source you play. The symbols are indicating two sine waves, where the upper respectively the lower are crossed out. Martin

Inden du begynder at skifte dyre ting, så mål lige laserstrømmen. I mange tilfælde er den drænet for strøm pga fejl i laser-kredsløbet, typisk C2103 som skal skiftes med en ny blå Philips som den originale. I sjældne tilfælde er transistoren defekt. Martin