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Problem
Analyze and
Identify the
Causes
Solutions
1.2.2
No response when power on
Defective SW1,U9(2323)
U10(2258)
No response when power on
Defective LED
Replace defective LED
1.2.3
LED indicator unlight
Problem
Analyze and
Identify the
Causes
Solutions
LED indicator unlight
Page 8/17
Version: 1.0
G
uide
S
ervice
Replace defective parts
Resolder or reconnect
MCU PCB OR AMP PCB
MCU PCB disconnected
from amp PCB
Replace defective U5(78L05)
Defective U5(78L05)
SW-HF5.1 4000