My B226 has difficulty to start playing a CD. Actually, it won’t start if I do not help it by gently moving the swing arm away from the spindle motor so that it can read TOC and start playing.
Here is how it behaves: when I insert a CD and press PLAY, disc will rotate clockwise for a second or two and then give up. Sometimes after rotating clockwise, it will stop and make a turn anticlockwise and stop. Observing the transport, when pressing PLAY, the swing arm will remain in the innermost position, not moving out of it to search and read TOC. When I press PLAY and move the laser a centimeter from the innermost position, it will begin searching, read the TOC and begin playing. The red laser light and lens movement can be observed.
Further observations and measured data:
Mechanical
- when powered off, the swing arm moves freely and will bounce once or twice when flicked with finger but it prefers returning to innermost position (flex cables)
- no dents or resistance can be felt when moving the swing arm with finger
- in service mode, step 1, the swing arm will not stay in middle position but will return to innermost position despite the offset compensation (-90mV in service mode, step 1)
- when going through service mode steps, swing arm moves faster to inner positions and slower to outside
- when moving to innermost position, swing arm often hits the end with a silent “clank!"
Electrical
- with no CD, offset of the radial motor is around zero V
- with CD inserted, offset of the radial motor is around 500mV in STOP
- in service mode, step 1, radial motor offset is set to -90mV to compensate for flex cable resistance (100mV is recommended maximum)
- swing arm voltages in service mode are symmetrical for same in and out deflections (minus the 90mV offset)
- focus motor voltage is within +/-50mV range in PLAY
- laser voltage is set to 200mV RMS
- focus amplifier is not hot to touch
Thank you in advance for your help.
Here is how it behaves: when I insert a CD and press PLAY, disc will rotate clockwise for a second or two and then give up. Sometimes after rotating clockwise, it will stop and make a turn anticlockwise and stop. Observing the transport, when pressing PLAY, the swing arm will remain in the innermost position, not moving out of it to search and read TOC. When I press PLAY and move the laser a centimeter from the innermost position, it will begin searching, read the TOC and begin playing. The red laser light and lens movement can be observed.
Further observations and measured data:
Mechanical
- when powered off, the swing arm moves freely and will bounce once or twice when flicked with finger but it prefers returning to innermost position (flex cables)
- no dents or resistance can be felt when moving the swing arm with finger
- in service mode, step 1, the swing arm will not stay in middle position but will return to innermost position despite the offset compensation (-90mV in service mode, step 1)
- when going through service mode steps, swing arm moves faster to inner positions and slower to outside
- when moving to innermost position, swing arm often hits the end with a silent “clank!"
Electrical
- with no CD, offset of the radial motor is around zero V
- with CD inserted, offset of the radial motor is around 500mV in STOP
- in service mode, step 1, radial motor offset is set to -90mV to compensate for flex cable resistance (100mV is recommended maximum)
- swing arm voltages in service mode are symmetrical for same in and out deflections (minus the 90mV offset)
- focus motor voltage is within +/-50mV range in PLAY
- laser voltage is set to 200mV RMS
- focus amplifier is not hot to touch
Thank you in advance for your help.
Hi PAM and thanks for your response. I forgot to mention that the player was entirely recapped in 2013, including the capacitors on the transport. I also tried to correct the spindle height, first by a quarter and then by a half turn clockwise (upwards) but to no avail. Perhaps I should tr in the other direction.
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