Page:8 of 18
Service Manual
SP-120
1.2.2 No sound
Version No.：1.0
No sound
1.It is due to PCB
short circuit /open
circuit/no
electricity;
2.The connecting
wire is inferior or
damaged, short
circuit/open circuit
CON1/CON2/CON3
1.J2/J3/D10/Q2 is bad
or damaged;
2.Potentiometer
VR1 is damaged;
3.PCB plug becomes
loose, or in poor
contact;
4.Headphone jack JK1
is bad or damaged.
Inspect/repair
Inspect/repair/replace
1.PCB sound channel
unit elements are
damaged. Speaker and
lead of U1，
JK1,C11,VR1,J2,J3，
Q1,Q2,Q3 and D10 are
damaged.
Inspect/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...
