Service Guide
SP-HF2.0 1250
1.2.2
Power LED (indicator) no light
Problem
Solutions
1.2.3 Volume , Treble , Bass no function
Problem
Solutions
Version : 1.0
Page 8 of 15
Power LED (indicator) no light
Power switch or LED
Defective,D1-4,
ZD1,ZD2,R37,R3
8,R47
AC cord of transformer
disconnected or
defective
Re-solder or replace
defective component(s)
Analyzer and
Identify the Causes
Volume , Treble ,Bass no
function
Broken or short circuit
DefectiveU1,VR1,VR2,
VR3, R11-12,R1-2,
Check solder points on PCB
Analyzer and
Identify the Causes
Check and Replace defective
components