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Service Guide
1.2.2
Power LED (indicator) no light
Problem
Analyzer and
Identify the Causes
Solutions
1.2.3 Volume no function
Problem
Analyzer and
Identify the Causes
Solutions
All manuals and user guides at all-guides.com
Power LED (indicator) no light
Power switch or LED defective
Broken or short circuit
Check solder points on PCB
Version : 1.0
Defective D60~D63,
VR1, Power, R60, R61
Re-solder or replace
defective component(s)
Volume no function
Volume: Defective VR1, VR2, R10, R20, C12,
C15, C22, C25, U1, U2, U3
Bass: Defective VR2, R30~R36, R39~R40,
C40-41, C44~C45, U1, U3
Check and Replace defective
components
Page 8 of 15
SW-S2.1 350
AC cord of transformer
disconnected or defective
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