Service Guide
SP-HF1800A
Version : 1.0
Page 8 of 16
1.2.2
Power LED (indicator) no light
Problem
Solutions
1.2.3 Volume , Treble , Bass no function
Problem
Solutions
Power LED (indicator) no light
Power switch or LED
Defective JK2,
Q101, R6, Z101,
CON4
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
Defective VR1, VR2, VR3,
C13, C23, C14, C24, C15,
C25, R15, R25
Check solder points on PCB
Analyzer and
Identify the Causes
Check and Replace defective
components
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