1.2.4 Hum and current noise
Service Manual
SP-120
Version No.:1.0
Page:10 of 18
Hum and current
noise
Power supply is
poor; filter
capacitor C22 is
damaged to cause
abnormal
interference of
voltage ripple by
power supply IC; PCB
is affected with
damp, polluted or
broken.
Signal earth line
of CON1 is bad
contact.
Inspect/repair/replace
Inspect/repair/replace
JK1 headphone jack
pin is with false
welding; copper
foil is broken;
potentiometer is
in use for long
time; spring is
bad contact when
turning knob.
Replace/repair
Summary of Contents for Genius SP-120
Page 1: ...Service Manual SP 120 Service Manual KEY SYSTEM CORP Page 1 of 18 Version No 1 0...
Page 15: ...Version No 1 0 Page 15 of 18 Chapter IV Assembly drawing Service Manual SP 120 Subwoofer...
Page 16: ...Satellite Service Manual SP 120 Version No 1 0 Page 16 of 18...
Page 18: ...Page 18 of 18 Service Manual SP 120 Version No 1 0 Chapter VI Schematic circuit diagram...