Teac DV-H500, Руководство по обслуживанию

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2-10
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.)
START
Is F601 normal?
YES
NO
A primary side abnormal
Check the GND of C601 and
IC68 Pin 3 with oscilloscope
END
END
To (A)
(A)
Is voltage D601 230V?
NO
NO
NO
NO
NO
NO
Is IC68 pin 3
switching normally?
YES
Are R607, D602,
normal?
YES
Are SN61 and R612
normal?
YES
Is PC61 normal?
YES
YES
Is CN63 pin 6 5.2V?
In condition of DC140V.
(Feedback is abnormal)
Check or
replace
D610,D622.
YES
YES
Is CN64 pin 3 5V?
YES
Is CN64
pin 9 and 11 12V?
YES
YES
NO
Are CN63 Pin 6
-32V, Pin 4 -22V and
Pin 5 -26V?
Is CN64
pin 1 and 2 3.3V?
YES
YES
YES
Are CN64
Pin 4 and 5 5V?
Does oscillate
continuously when the
CN63 is disconnected?
When IC68
Oscillating
Secondary side
is abnormal.
NO NO
Is IC61
normal?
Replace defective
Parts.
Replace D616,
Q602 and Q609.
Are R618, C626,
R621 and R910
normal?
After connect
CN63
Pin 2 , 7 Short.
NO
Front Circuit
Board is
abnormal
Replace
defective
parts.
Replace IC66
NO
Check Q622
and Q617.
NO
NO
Check Q621
and Q623.
NO
Are D610, D611
D612, D614, D615
and D617 normal?
YES
Is CN63 Pin 2
5.2V?
YES