The MC908 is microcontroller with internal flash memory, manufactured by Motorola / Freescale Semiconductor.
(Full number MC68HC908QY4CPE)
If you get a replacement of any type other than from the UPS manufacturer, it will not contain 'their' software to run the unit.
See the link below for the data.
Note that if that does not appear to be giving the correct signals out, it's likely it's not seeing the right conditions in the UPS to allow it to operate, or the low voltage logic power supply has failed.
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The MC908 is microcontroller with internal flash memory, manufactured by Motorola / Freescale Semiconductor.
(Full number MC68HC908QY4CPE)
If you get a replacement of any type other than from the UPS manufacturer, it will not contain 'their' software to run the unit.
See the link below for the data.
Note that if that does not appear to be giving the correct signals out, it's likely it's not seeing the right conditions in the UPS to allow it to operate, or the low voltage logic power supply has failed.