Recent content by M&M

  1. M

    Pioneer SX-737 protection circuit problems

    Hi, thanks for dobblechecking the transistors. I exchanged the transistors on both channels the same way. What does it mean "gain matched"? I checked the solder joints. Nothing seems cold or cracked. The solder appears in a pretty good condition. @ rikardo: What means turning on with a dbt...
  2. M

    Pioneer SX-737 protection circuit problems

    I am quite sure that I installed them correctly. i attached a picture. I used following transistors: 2sc1451 -> NPN 30 KSC3503DSTU TO-126 FSC 2sa726 -> PNP 120 KSA992FTA TO-92-3 FSC
  3. M

    Pioneer SX-737 protection circuit problems

    Hi, i changed the transistors 2sa726 and 2sc1451 on the AWH-033. Now the amp is doing nothing anymore. Well, i can switch it on, but no sound. No relay clicking when switching it on. Can anyone help me with the next step?
  4. M

    Pioneer SX-737 protection circuit problems

    I measured following signals with the actual trimmer positions: AWM-025 Pin 1: 0.2V stable Pin 2: -13.04V stable Pin 3: 0.18V stable Pin 9: 41.9 V (stable) when sound is cut out, and 10.3V (stable) when it all works fine Pin 10 and 11: 41.8V stable Pin 12: 6.28-6.30V AC Power supply circuit...
  5. M

    Pioneer SX-737 protection circuit problems

    Hi. Thanks for your help :) I followed pauls instructions. This is my result after adjusting the trimmers: Pin 3 -> 0.2V (0V is not possible i turned it to the minimum end position) Pin 17 -> 0.2V (0V is not possible i turned it to the minimum end position) Pin1-2 -> 12mV (10mV is not...
  6. M

    Pioneer SX-737 protection circuit problems

    Hi folks, as you can see I am pretty new here. I found this great forum by looking for help with a broken stereo. My friends Pioneer SX-737 has problems that match exactly on DinD's description in the thread "Pioneer x737 bad relay or s.th.": After switching off the stereo and waiting for a...
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