Mark-sf

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  • in reply to: Beocenter 8000 and Active Speakers? #27045
    Mark-sf
    BRONZE Member

      You can use the Line input into the Beolabs as I described above as they will turn on when they sense an audio signal.

      in reply to: Beocenter 8000 and Active Speakers? #26990
      Mark-sf
      BRONZE Member

        Which active speakers are you considering?  If not B&O you can pad the speaker output or use the headphone output directly.

        in reply to: Beogram 1602 Tracking #26261
        Mark-sf
        BRONZE Member

          What you are hearing when you physically touch the stylus is cantilever movement not the condition of the diamond. Have it checked under a microscope as it might be that the diamond portion might be missing.

          in reply to: Beogram 1602 Tracking #26196
          Mark-sf
          BRONZE Member

            My guess is that you are not really tracking at that weight. How did you measure 1.44g?

            in reply to: Beogram 8002 #26121
            Mark-sf
            BRONZE Member

              You simply need a Moving Magnet Phono Preamp even though your cartridge is a moving iron type. I can recommend the Schiit Mani as a great value. There are also ones from Parasound, Pro-Ject, and Rega to name other quality units.

              Mark-sf
              BRONZE Member

                If you don’t have any test equipment such as a multimeter and oscilloscope, you should have it looked at by a B&O service tech.

                Mark-sf
                BRONZE Member

                  From the diodes D200, 201, & 202 all three sources share the same circuit. So I would start by checking whether you have a signal on the anodes of D200 (Phono) and D201 (Tape). If not then I would trace back into their respective preamp circuits.

                  in reply to: Beogram 4002 – Tonearm won’t move (another) #25510
                  Mark-sf
                  BRONZE Member

                    This is a common problem. You need to disassemble and clean the pivot point that the spring /arm is attached to as well as the up/down pivot that the solenoid plunger moves. Both of these get gummed up through non-use.

                    in reply to: Beomaster 3000-2 input signal trace design #25399
                    Mark-sf
                    BRONZE Member

                      The signal path is described later in the service manual where you have gotten the schematic.

                      in reply to: Beogram 4500 pickup does not move #25014
                      Mark-sf
                      BRONZE Member

                        Yes, the platter is the metal disk that the record supports and when shipped from the factory it is removed and in its own styrofoam piece. The stylus will not scratch it but if its loose it can destroy the cantilever that holds the stylus as well as the tonearm.

                        To reattach the cord, download the service manual from either the Members area here or Beomanuals.com. You will see the pictures.

                        in reply to: Beogram 4500 pickup does not move #24980
                        Mark-sf
                        BRONZE Member

                          I would not accept a shipment where the platter and cartridge were not removed. Padding can help it survive without the transport screws engaged but an in place platter will likely cause damage. You are correct that the cord is necessary for arm movement as it goes around two pallets that are driven from the arm motor.

                          in reply to: Beomaster 3000-2 Won’t Power On #24594
                          Mark-sf
                          BRONZE Member

                            Have you checked the fuse as the load surge may have blown it?

                            in reply to: Beomaster 3000-2 heavy distortion from right channel #24428
                            Mark-sf
                            BRONZE Member

                              The base of TR45 should be adjusted to 27.2 which should give you 26.6 at the collector of TR48. If the base of TR44 is 29.2V and you still are seeing a drop to 22V then the speaker output voltage before the output cap can’t be 28v. Note that the positive side has an 100 ohm resister to isolate it where the negative doesn’t. You need to further investigate after  TR47 for the current draw.

                              in reply to: Beomaster 3000-2 heavy distortion from right channel #24425
                              Mark-sf
                              BRONZE Member

                                The 250-ohm trimmer and TR45 governs how much no load bias is applied to each base. It is mounted on the heat sink to sense temperature and also adjust the bias. It’s possible that transister is bad or the adjustment is too high. The circuit calls for a BC311 and since the bias is not separately adjustable for its BC310 mate its possible that your BC161 is a poor match. Sorry, but its been too many years since I worked on one of these.

                                • This reply was modified 6 months ago by Mark-sf.
                                in reply to: Beomaster 3000-2 heavy distortion from right channel #24418
                                Mark-sf
                                BRONZE Member

                                  Glad you got it sorted out as I was out of suggestions. First try the bias adjustment.

                                  in reply to: Beomaster 3000-2 heavy distortion from right channel #24356
                                  Mark-sf
                                  BRONZE Member

                                    The diode is blocking current flow from TR48 collector to base of TR47 as it conducts in the other direction due to the higher voltage that is supposed to be on the base. Therefore, it cannot be bypassed with a jumper.

                                    You say there is 0 volts on the anode, is it the same at the collector leg of TR46 and the base leg of TR47? If you power down, what is the ohms reading to ground from the anode for each channel?

                                    in reply to: Beomaster 3000-2 heavy distortion from right channel #24326
                                    Mark-sf
                                    BRONZE Member

                                      It’s possible you have a broken trace at the anode of the diode. Try a jumper from it to the base of TR47 and the collector of TR46. Don’t know what else to suggest based on what you are reporting.

                                      in reply to: Beomaster 3000-2 heavy distortion from right channel #24313
                                      Mark-sf
                                      BRONZE Member

                                        You misunderstood my suggestion.  If the voltages are not as specified in the schematic the transistor will not turn on even if it is good. What are the actual base and emitter voltages?

                                        in reply to: Beomaster 3000-2 heavy distortion from right channel #24307
                                        Mark-sf
                                        BRONZE Member

                                          It sounds like TR46 is not being turned on. Are the voltages on its base and emitter as per the diagram?

                                          in reply to: Beogram 6500 gets stuck after a while #23995
                                          Mark-sf
                                          BRONZE Member

                                            I just did some more troubleshooting, The tracking force seems to be right, 1,19g (measured with a jewelers scale). It randomly skips/repeats the groove, maybe every 20-30 seconds. I can’t see any obvious reason why and the tonearm seems parallel to the sensor arm the whole time, even when it skips.

                                            I would remove the platter and press play without the record. Once the arm drops, I would tap it just enough for it to start progressing in. This way you can observe where or when it may be hanging up.

                                            As to your standby problem, I would try running the TT without connecting to the  Beomaster and seeing if it still stops.

                                          Viewing 20 posts - 21 through 40 (of 284 total)