16
8-2 . Problem Checkking And Method Of Pcb

8-2-1 The Part Of Power Source

YES
YES
NO
YES
NO
YES
NO Power On
Check The Trans
Check The Diode(D6,7,8,9,11)
And Condenser(CE3)
Exchange IC2(7805) And
Check The
Condenser(CE5)
The Voltage Of
Betweenⓐand ⓑIs
As Big As 12V?
7805
D6,7,8,9
D11
CE3
CE5
IC2
ⓐ
ⓑ
ⓒ
ⓓ
ⓔ16
47
17
48
20
TRANS 2200UF 470UF
The Voltage Of
Betweenⓒand ⓓIs
As Big As 12V?
The Voltage Of
Betweenⓔand ⓓIs
As Big As 5V?
NO
R14
33K
R15
33K