ER-A220 (serv.man9). CR-A280 Technical Update Cash Drawer fuse blowing, Preventative maintenance - Sharp ECR Technical Bulletin (repair manual). Page 2

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Change the following items
Under side of the Board
3)Add the diode (VHD1N4002//-1) or
(VHD1SR139-400)
1)  Remove ICP103, and the short the circuit
2) Change FB3 to Fuse (QFS-K2007BHZZ) 500mA
Remove ICP103
and add short
Add 1N4002 diode
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