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66.00.15 is a momentary power failure at the mailbox, most likely caused by the little power supply box. Check it for connections especialy the ac power end into the box.<br />
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Here's what the manual says:<br />
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66.00.65<br />
A communication error occurred in the Paper Handling Controller or in the controller PCA of an external paper handling device.<br />
1. Turn the printer off, and then turn the printer on.<br />
2. Replace or exchange C-link cables.<br />
3. If the problem persists, replace the PCA controller board for the input or output device.<br />
4. If the problem persists, replace the Formatter PCA.
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This printer keeps losing its connections to the mailbox unit and tray 4 with an error code of 66.00.15 &nbsp;&quot;Paper handling Controller Error&quot;<br />
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&nbsp;If I unplug all the C-link cables and the power cables going into the power box enough times I can eventually get them to power up again. I'm thinking it must be the power box they plug into, unless I might be missing something<br />
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Just wondering if anyone has seen this problem before
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This printer keeps losing its connections to the mailbox unit and tray 4 with an error code of 66.00.15  "Paper handling Controller Error"

 If I unplug all the C-link cables and the power cables going into the power box enough times I can eventually get them to power up again. I'm thinking it must be the power box they plug into, unless I might be missing something

Just wondering if anyone has seen this problem before

HP 8100 Losing power to tray 4 and mailbox unit

A printer is a peripheral which makes a persistent human readable representation of graphics or text on paper or similar physical media. Traditional printers are being used more for special purposes, like printing photographs or artwork, and are no longer a must-have peripheral; 3D printing has become an area of intense interest, allowing the creation of physical objects. An image scanner is a device that optically scans images, printed text, handwriting, or an object, and converts it to a digital image. Hand-held scanners, where the device is moved by hand, have evolved from text scanning "wands" to 3D scanners used for industrial design, reverse engineering, test and measurement, orthotics, gaming and other applications.