Service manual

6. 2 Trouble Shooting Procedures
6.2.1 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
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 LED
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 LED give
abnormal
message?
Yes
Does the problem
still exist?
No
Yes
LCD
Yes
No
LCD
Find the problem and solution
according to function circuit
introduction and possible
problem and solution
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