Sensor control defect

This appears to be a Ricoh printer error message. Error messages are generally brand specific.

One website offers the following about this error message:

Code
SC121
Description
Scanner home position error 2
The scanner home position sensor does not detect the on condition during initialization or copying.
Causes
• Scanner home position sensor defective • Scanner drive motor defective • IOCSS board defective • Scanner home position sensor harness defective bq

In other words, it appears to be a message that a physical component of the printer is blown, bad, defective. That leaves you looking up the warranty and weighing the cost of repair or replacement. As you have not identified the model of the printer, it is impossible to weigh the cost/reward of repair.

Patti, you may have to do a hard reset.
1) Disconnect the USB cable from your computer
2) Remove the ink cartridges
3) Unplug the power cord. Wait for a couple minutes. Plug the unit back in,hit power button if needed.
4) Wait for the "Insert Cartridges" message, reinstall the cartridges
5) Close printers doors
6) If you get a recalibration message, allow the printer to complete this task
7) Reconnect printer to USB cable
8) Try your printing again.
Check the attached links,instruction and guides, Good luck
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Re How to perform Hard Reset
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General Printer error with no alphanumerical code in Mac Control panel for...

If unit is under warranty HP will help you for about a year. After one year they have a get bent attitude and you will have to "google" the error code and see what you come up. Trust me you will find links re the situation. Think you are the only one going through the same sh**?

Try here: http://www8.hp.com/us/en/support-drivers.html?jumpid=ex_r11400_us/en//IPG/_ps_g_hpprintererror/PrinterErrors&k_clickid=AMS'13'49712'6ab8a6c4-c153-7208-ab27-00000eb53ab6

It also printed on your computer screen as "HP Printer Error 0x61011bed". HP printer error 61011bed occurs when there is a problem with the printer head. It also comes up when you try to align your printer's ink cartridge. HP Printer Error 0X61011BEB is a common error that occurs in most HP printers. To get rid of this error from your HP printer you need to know how to fix it. If you need any kind of information, then you can contact Visiontechnews.

This generally means that the cartridge is empty or defective and needs to be replaced with a new one.

Check the following information please.

General print quality issues

Solving issues with color documents This section describes issues that can occur when you print in color. Color document issues Problem Cause Solution Only black is printing when the document should be printing in color.

Color mode is not selected in your program or printer driver. Select color mode instead of grayscale mode. The correct printer driver might not be selected in the program. Select the correct printer driver. The device might not be correctly configured. Print a Configuration page.

One or more colors are not printing, or are inaccurate.

Sealing tape might be on the print cartridges. Verify that the sealing tape has been completely removed from the print cartridges. The media might not meet HP specifications. Use a different paper, such as high-quality paper that is intended for color laser printers. The device might be operating in excessively humid conditions. Verify that the device environment is within humidity specifications. One or more print cartridges might be low. If you are using non-HP print cartridges, no messages appear on the device control panel or in the HP Toolbox. Replace any low print cartridges. The control panel is set for override. Replace low or empty print cartridges. A color is printing inconsistently after you load a new print cartridge.

Another print cartridge might be low. If you are using a non-HP print cartridge, it might be low or empty but you will receive no indication. Remove the print cartridge for the color that is printing inconsistently and reinstall it. The control panel is set for override. Replace low or empty print cartridges. The colors on the printed page do not match the colors as they appear on the screen.

The colors on your computer monitor might differ from the device output. Select Screen Match in the Color tab of the printer driver. If extremely light colors or extremely dark colors on screen are not printing, your software program might interpret extremely light colors as white or extremely dark colors as black. If possible, avoid using extremely light or extremely dark colors. The media might not meet HP specifications. Use a different paper, such as high-quality paper that is intended for color laser printers. The finish on the printed color page is inconsistent.

The media might be too rough. Use a smooth paper or print media, such as a high-quality paper that is made for color laser printers. Generally, smoother media produces better results. Repetitive image defect ruler Use a repetitive image defect ruler to measure occurrences of repetitive image defects to help solve image quality problems. Place the ruler next to the first occurrence of the defect on the page. Find the distance between identical defects and see the Repetitive image defects table to identify the component that is causing the defect. Repetitive image defects Measurement Component 24.7 mm0.97 inch Developer sleeve 26.7 mm1.05 inches Charge roller 32.9 mm1.3 inches RS roller 37.7 mm1.48 inches Transfer roller 54.5 mm2.15 inches ETB rollers 56.6 mm2.22 inches Fuser sleeve 62.8 mm2.47 inches Pressure roller 75.4 mm2.97 inches OPC
Have a good evening