| Jeroni Paul <JERONI.PAUL@terra.es>: Oct 17 10:19AM -0700 Jeroni Paul wrote: > A secondary sympthom (maybe related) is when playback is stopped through the stop button, the sled returns home and at the end the sled gears slip some teeth because the inertia, the motor does not brake in time. BUT if playback is stopped with the stand-by button instead, it does the same without teeth slippage, because it brakes. I ran some tests shorting the switch contacts and with the Stop button the sled moves some extra millimeters due to inertia. I can't explain how the BA6296FP can stop the motor without brake as its MUTE signal is wired to Vcc. I found this happens because when the CD stops and the sled returns home, the controller cuts power to it so fast that does not allow the driver to brake the sled motor. I have jumped the power-on signal to always active and it brakes properly. Design defect? But the initial disk reading problem remains, maybe they are not related. I tried to readjust the focus bias pot and it was already right. I'm doing some tests heating the board and that seems to have some effect but will require more tests to narrow down. Service manual: https://elektrotanya.com/aiwa_nsx-500_xg-500_cx-3500.pdf/download.html |
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