Acer AL1702 Manuel d'entretien - Page 26

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Acer AL1702 Manuel d'entretien

12. Power Board

Page 24
Check output voltage +5V, +12V and 22V
is right or not.
Yes
No
Check power switch is turn on or not.
No
Yes
Check power cord (P801), signal
cable (P302), P802, P803, CN102,
CN103 is connected right or not.
No
Yes
Check C805 is about DC140V-330V
or not.
No
Yes
Check C807 is over 10V or not.
No
Yes
Check pin 6 of I801 have same
pulse or not.
No
Yes
Check pin 1 of T802 have same
pulse or not.
No
Yes
Check peak voltage of R811 triangle
pulse is up to 1 volt or not.
No
Yes
Check D809, D810, D811, C818,
C817, C822, T802 have same short
circuit, or the output +5V/+12V/+22V
is over load.
No
Yes
Check feedback circuit around I802,
I803 and the other components and
repair them.
It is not power board problem.
Turn switch on.
Connect it right
Check F801, D801, P801 and repair
them.
Check R805, R803, I801 and repair
them.
Check peripheral co,of I801 and
repair them.
Check Q803, R813, R814, D806,
R812 and repair them.
Check D804, R807 and repair them.
Repair them.
AL1702