Ricoh M160 Service Manual page 481

Main SP Tables-5
5307 [Daylight Saving Time]
5-307-101 Setting
M160/M161
[0 or 1 / 1 / 1/step]
0: Disabled
1: Enabled
(Default)
1: NA and EUR
0: ASIA and others
C* Enables or disables the summer time
mode.

Make sure that both
SP5-307-3 and -4 are
correctly set. Otherwise, this
SP is not activated even if this
SP is set to "1".
3-68 SM Appendix