Service Guide Model No : SP-i300
1.2 LED no light
Problem
Analyzer and
Identify the Causes
Solutions
1.3 Power/Function Knob no function
Problem
Analyzer and
Identify the Causes
Solutions
Power LED no light
Component cold
solder or Short
Circuit
Defective U1, U2,
U4, U6, U7 or Y1
BT1 or LED1, LED2
defective
Check solder
point on PCBA
Check and
Replace defective
IC or Crystal
Replace defective LED or
Battery
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Power/Function Knob no
function
Component cold
solder or Short
Circuit
Defective U2 or
Y1
VR-SW J1 or SW1 ,SW2,
SW3, SW4 defective
Check solder
point on PCBA
Check and
Replace defective
IC or Crystal
Replace defective VR or
Tact SW
