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Old 26th September 2012, 11:06 PM   #1
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Default Theta Miles - HELP

My Theta Miles stopped working. The CDP behaves like there is no disc. The unit powers up, display comes ON, all function buttons on the panel seem working, there is response on the display when I push buttons. After pushing play button, the main drive motor won't spin but I can see the laser diode lit and trying to focus for a while. I checked all voltages, all power supplies are just fine. I measured all voltages directly on PCB on decoder, servo and control chip, all is OK. There was no voltage coming out of decoder chip from pin # 2 and 3, that controls the spindle motor, so I changed the chip thinking the decoder was KO, but it didn't help. Now, is the servo control chip or the laser pickup with laser amplifier kaput? What else could it be? The thing is that I can not even check the signals with scope because it doesn't output anything since it doesn't work.
Theta Miles is based on Pioneer stable platter mechanism with Pioneer control PCB from PD-S505 model. Schematic attached.
Any help appreciated.
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Old 26th September 2012, 11:26 PM   #2
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Couldn't upload schematic, file too big.
here is the link for PDF
PIONEER PD-S505 605 Service Manual free download, schematics, eeprom, repair info for electronics
there is a "Get manual" under the picture
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Old 27th September 2012, 02:35 AM   #3
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I assume you would have noticed if the lens had fallen out of the laser? This is the single most common fault for stable platter units. On the later models like this one, it is not at all rare for the laser to simply go bad, and it sounds like this is most likely the case, if not a fallen out lens.
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Old 27th September 2012, 10:22 PM   #4
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The lens is indeed in place. The lens element is moving trying to focus but the motor won't turn. I don't know the sequence on "play on" mode. Actually how does it work? Is the decoder processor waiting for valid data coming from servo control and then sends the command to motor drive, or should the motor drive start spinning on "play command" and if no data received it will automatically stop.??
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Old 27th September 2012, 10:56 PM   #5
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Here are the files, schematics.
Attached Files
File Type: pdf Pioneer_pd-s505_1.pdf (92.5 KB, 42 views)
File Type: pdf Pioneer_pd-s505_2.pdf (177.3 KB, 7 views)
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Old 28th September 2012, 03:34 AM   #6
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The servo controller looks for focus lock from the laser before it will start up the platter motor. When these lasers fail, it's the PD array that goes south(receiving side of the laser), so you have perfectly good laser light output, but no or improper output from the PD array, so no focus lock, no spin.
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