Service Guide
SW-Flat2.1 700
Version : 1.0
Page 8 of 15
1.2.2
Power LED (indicator) no light
Problem
Solutions
1.2.3 Volume no function
Problem
Solutions
Power LED (indicator) no light
Power switch or LED defective
Defective :D1~D4,
Jack6,C37~38,U4,R1
AC cord of transformer
disconnected or defective
Re-solder or replace
defective component(s)
Analyzer and
Identify the Causes
Volume no function
Broken or short circuit
Volume: Defective VR, Jack1, Jack4, Jack5, U1,
C10~16..
Bass: Defective VR, Jack1, Jack4, Jack5,
U2,,U3, Q1,Q2,R19,.
Check solder points on PCB
Analyzer and
Identify the Causes
Check and Replace defective
components
