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2. Power Circuit
Input Voltage : 230 V
It is possible to malfunction, if the unload condition is left for a long time when power on.
(More than Dummy load 100mA)
The resistor value of both terminal is measured with DVM crossing each other to check the each element is normal or abnormal.
(It is normal when the numerical value is different each other.)
Check the GND of C601 and
IC68 Pin 3 with oscilloscope
When IC68
Oscillating
Does oscillate
continuously when the
CN63 is disconnected?
YES
Secondary side
is abnormal.
Front Circuit
Board is
abnormal
Are D610, D611
D612, D614, D615
and D617 normal?
YES
NO
Is CN63 Pin 2
5.2V?
YES
Replace
defective
parts.
END
START
Is F601 normal?
YES
Is IC68 pin 3
NO
switching normally?
YES
Is CN63 pin 6 5.2V?
After connect
CN63
Pin 2 , 7 Short.
(A)
YES
Are CN64
NO
Pin 4 and 5 5V?
Replace D616,
YES
Q602 and Q609.
NO
Is CN64 pin 3 5V?
Replace IC66
YES
Is CN64
NO
pin 9 and 11 12V?
Check Q622
YES
and Q617.
Is CN64
NO
pin 1 and 2 3.3V?
Check Q621
YES
and Q623.
Are CN63 Pin 6
-32V, Pin 4 -22V and
Pin 5 -26V?
YES
NO
A primary side abnormal
NO
Is IC61
normal?
In condition of DC140V.
YES
(Feedback is abnormal)
NO
Check or
replace
D610,D622.
Are R618, C626,
R621 and R910
normal?
To (A)
NO
2-10
Is voltage D601 230V?
YES
Are R607, D602,
normal?
YES
Are SN61 and R612
normal?
YES
NO
Is PC61 normal?
YES
END
Replace defective
Parts.
NO
NO
NO
NO
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