Martin Thank you! I never knew this about CD-R's! I learn something new every day! For safety's sake, I will invest in a test CD for alignment, although to be honest, I never had a customer complain that his CD wasn't reading CD's after he got it back from me. Even though graham says he doesn't need it ;-) After alignment, I will

These are Vishay BC NFR25 Fusible, non-flammable resistors. Do not replace them with any other type. In the Philips CDM2 Service Manual, they are listed as safety components, not to be substituted with anything else. I have stock of these on hand. Metal Film are not wise replacements here anyway, even if the originals were not the NFR type. In power

Graham, No flak at all - I also don't have any special "test-cd". In fact I use a CD-R which I burned. If I calibrate it for this, it will read anything. Cableguy - This is how you want to adjust the Laser, as Graham said, you've done only the first stage of three. The second stage is adjusting the 1K pot to give 50mV across R3102

Agent, "This was the worst piece of crap I have read in a very long time! Yes, of course it will be good at blocking DC. But it will block your bass range too! " With all due respect, your comments overstepped your mark. I specified that these are the signal-path COUPLING capacitors, not decoupling. You are right for decoupling, but you are

Hi Tommy, You're right of course, about the phono-preamp - an important lack in the 9300! I have restored tens of CD Players, and my ears (YMMV) prefer the TDA1541 units over everything else, including Arcam's pretty impressive dCs RingDAC (Yes, I've restored that one too, and the A-B comparison was great fun!). I must clarify that my own

Hi Pattabhi This will give you a bit of insight on the 9300. http://www.condoraudio.com/wp-content/uploads/Projects/BeoCenter-8000-8500-9000-9300-9500-Receiver-Upgrade-Repair.pdf The output amplifiers are basically identical. The preamplifiers are very similar. The 9500 has the CDM2 with the exceptional TDA1541 DAC, while the 9300 has the CDM4 bitsteam

Eugene Nice diodes he used in there for the bridge BYV27-200. Very high-quality, very fast. It is part of the reason you've got good sound there. Have you got a scope? Check the output from the 2 bridges there, and you'll see the difference in power quality ;-) My first choice for bridge replacement is 11DQ10 (1.1Amp), or 31DQ10 (3.3Amp), depending

I am repairing a 9300, with the CDM12.4 laser. The Service Manual main part has adjustment procedures for the original CDM4 laser, but in the SM Supplement for the CDM12, there are circuit diagrams only, with no instructions for adjustment. Does anyone know which trimpots must be adjusted for what current, and at which points on the PCB is this adjustment

My BeoMaster 3400 also has a toroidal transformer - I think that it's something to do with more oomph per cubic centimeter, than anything else. And the flattish top-accessible units are squeezed for internal space, so a toroidal makes more sense. Menahem

Well, that turned out to be a temporary fix - ain't this fun! The distortion is back, and I have to focus on the semiconductors. That waveform shape is a clue - it looks like a funny rectification. I patiently checked all the transistors - all appeared to be OK. I then focused on the diodes - it has 14 OA90's. I unsoldered a leg, and checked