Technical information

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5. Power board
715G2824 1C 2(E191W)
1. No Power
Check to CN902 Pin3, 4 = 5 V
OK
Check Interface board
Check AC line volt 120V or 220V
Change F901, Check BD901, IC901
Check the voltage of C905(+)
Check bridge retified circuit
Check start voltage for the Pin3 of IC901
Chan
g
e IC901
OK
Check the auxiliary voltage is smaller than 20V
OK
NG
No power
NG
NG
OK
Check T901,D906, D907,D908,Q903,ZD902,ZD903,IC903,IC904
Check IC901
NG
OK
NG