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POSBPrint is an automated machine which you use to update your passbook.
You can access POSBPrint anytime between 7 am to 11 pm daily.(Subject to Bank's maintenance schedule)
To update your passbook, simply turn to the last printed page and insert passbook into the passbook slot.
There could be numerous reasons which may (or may not) be related to the machine.
If you are not able to update your passbook, please visit any DBS/POSB Branch for help or have your passbook replaced.