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5.4.1 How To Start
Trouble shooting start
point selection begin
Is there any Trouble
information
Can the product
power up?
Visual Inspection
Sign of Burn, damage,
contaminate on the
outlet, sockets,
connectors
Impedance
measurement
Make sure NO Short-
circuit at battery
connector, input mains
socket, output socket
Apply Power
supply to the UPS
Can the UPS be
turned on?
Following instruction: Test
after repair
Yes
Yes
Follow the display
message explanation
and solution table
Start PCB board
static checking
process
Yes
Yes
Check
with power
on
Check
with power
on
Trouble shooting start
point selection end
No
No
Does Display give
abnormal
message?
Does the problem
still exist?
Yes
No
Yes
Find the problem and solution
according to function circuit
introduction and possible
problem and solution
Yes
No
Figure 5.4.1. General Guidance to start a trouble shooting process
