Ricoh M281 Series Service Manual page 799

1001 Bit Switch
Bit 6 The tray selection setting when a paper
size or paper type mismatch occurs.
If the tray selection setting is enabled, selecting the tray that the "Apply
Auto Paper Select" setting is configured to "Off" cannot be done when a
paper size or paper type mismatch occurs.
bit 7 DFU
1001 Bit Switch
012 Bit Switch C
bit 0 DFU
to 4
bit 5 Change the user ID type displayed on the
operation panel
As of 15S models, the Login User Name can be displayed on the
operation panel. The user ID type displayed on the operation panel can be
changed by configuring BitSwitch #12-5 as follows:

0 (default): Login User Name

1: User ID. If this is enabled, User ID will be displayed, which is
equivalent to the behavior exhibited in 14A and earlier models.
bit 6 AirPrint
AirPrint can be disabled by changing this BitSwitch from 0 (default) to 1.
bit 7 DFU
1003 [Clear Setting]
1003-001 Initialize System
1003-003 Delete Program
SM Appendix
Disabled
0
-
Disabled
Enabled
-
Initializes settings in the System menu of the
user mode.
DFU
3-159
Printer Service Mode
Enabled
- -
1
-
Enabled
Disabled
-
D255/D256/M281/M282