UP-600, UP-700 (serv.man29). Latest FAQ's (Updated Feb 2007) - Sharp ECR FAQ (repair manual). Page 108

Read Sharp UP-600 / UP-700 (serv.man29) FAQ online

UP-600/700 Frequently Asked Questions
UP-600/700 Frequently Asked Questions
The UP-600/700 is  locked out and the word
“OFF” is displayed on screen, this happened
when the mode switch position was being
changed.
This solution to this is to install SSP-005, this only
applies to main ROM's version 1A and 1B.
Please refer to Technical update on the Web
Please refer to Technical update on the Web
Firmware
Firmware
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