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  1. J

    Casio WK-3000 no power on adapter but power on batteries

    Have this keyboard with a tested good DC adapter but will not power up (unless running on batteries. Adapter is a 12V negative tip as required. Was concerned the DC power socket was not making contact consistent contact so replaced that.. See attached circuit diagrams. On diagram 1, I see 12...
  2. J

    Pioneer SX-1080 Tuning meter stuck - but may not be mechanical but circuit related

    Have a pioneer SX-1080 receiver that I'm trying to complete. The Signal tuning meter randomly "sticks" on power up - no movement at all. The signal tuning meter is responsive to an ohmeter connection (both directions) when in this condition. Posted this issue a while back on another forum and...
  3. J

    Help with Cassette Dolby circuit debug

    Have a Vintage Kenwood KX-1030 tape deck with noise in the left channel audio. This occurs even when playing back a blank tape, all setting normal or turned off (e,g. normal bias/eq, dolby turned off etc). Using and audio tester (I don't have an oscilloscope) audio was good at the Playback head...
  4. J

    Help with Power supply to Florescent display circuit fault

    Have a Tascam Portstudio 244 (MKII) 4 track cassette recorder. Initially, it had no power at all, tape transport mechanism not moving, no display,etc. Dead. I checked the power supply board and found several leaky/bad caps and replaced. Was enough to get the tape mech working but still couldn't...
  5. J

    kenwood TK-40 Output problem - need help with circuit debug

    Have a Vintage kenwood TK40 with no output on either channel (maybe a very minimal sound if volume turned 100% up). I found a number of caps in the power section to be bad on ESR meter, though surprisingly not the larger ones. Replaced all the bad ones but only seeing 40V dc on the left side of...
  6. J

    Balance control problem on Panasonic SG-999

    Have a vintage Panasonic SG-999 integrated stereo, pop up turntable experiencing a strange balance control problem. On one channel, the balance control works fine, meaning if you start center and go to one end it attenuates and fades the signal on that channel down to zero. On the other channel...
  7. J

    Problem with Vintage Pioneer receiver SX-1000TW Output

    Have a vintage Pioneer SX-1000TX receiver that the right channel doesn't seem to be working 100%. The output is slightly lower than the left channel and "thin" as best I can describe it (e.g. lacking any body to the sound). I have the schematics and have done some basic trouble shooting but at a...
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