Xtreme Power Conversion Corporation
M90S Service Manual
Page 4
Uninterruptible Power Supply
1. General Information
1.1 Getting started
This manual is for the M90S series UPS. It can help service personel perform the basic maintenance and repair
service.
This manual only focuses on the service section, so you should get the basic operation of the UPS from the user
manual, and make sure you have read and understood the user manual before reading the manual.
The manual include 8 sections, as follows
• General Information, this section show you the general information of the service manual
• Functional Block, this section show you the major functional block of the UP S
• Working Principle of the major Functional Block , this section show you the m ajor functional block
• Function explanations for each PCB, this section show you all the PCBs of the UPS
• Interface, this section show you the LCD interface, include display and setting
• Trouble shooting, this section will give you the way to find the trouble
• Test step, this section tell you how to test the UPS after you repair the unit
• Electric Specifications, this section show you the basic electric specification of the UPS
Important Safety Instructions
For qualified service person only.
Do NOT perform any internal service or adjustment of this product unless the technical person is well
trained and experienced.
Dangerous voltage exists at several points in this product. To avoid personal injury, don’t touch any
exposed connections or components while UPS is on.
Turn off the UPS and switch off the input breaker before removing protective case. AC voltage is always
present if the input AC power is still available.
High voltage may exist at DC capacitors. Before removing the protective case, wait for at least five minutes
after turning off the UPS.
Verify input source (voltage and frequency) is within the maximum range before service.
