Almost all modern multifunction printer/scanner/Fax/etc. machines are able to switch between:
(1) a mode that ensures that pure black and white originals (eg, black text on white paper) are scanned or printed as pure B&W; and
(2) a mode that ensures that continuous tone (ie, gray scale or "contone") originals (eg, photographs) are scanned and/or are printed as continuous tone output.
As I expected, your device has this capability. The manual is here:
http://support.ricoh.com/bb_v1oi/pub_e/oi/0001048/0001048464/VM1568602A/M1568602A.pdf
Here is a screen grab of a couple of pages in the manual that describes the basics of these two modes:
View attachment 71253
My guess is that you simply didn't select or even check the settings when you experienced the problem. Other sections of the manual describe in more detail how to adjust the settings when your device is operating in its various functions (eg, as a scanner, as a printer, as a FAX machine, etc.). Devices such as this have become so complicated, it is almost essential to read the manual that came with the device.
HTH,
Tom M
PS - When you switch your device from contone originals to B&W, internally, it does almost exactly the same thing that Gedstar showed you how to do after-the-fact in Photoshop.