Modify circuit for Erase data W27E512/010,SST27SFxxx


figure 1. cut trace and add part

Figure 2. Schematic PCB3

WinBond Chip (W27E512,W27E010,W27C010)
  1. Cut trace PCB U5A(pin 12) to ZIF32(pin 26) and add part figure. 1
  2. parallel R15(2k2) with resistor 15Kohm for increase Vpp(12.5V) to Vpe(14V) figure. 2
  3. Run program Eprom.exe
  4. Select Device W27E512
  5. short JPx (close)
  6. click Icon Erase (It will Erase and check blank)
  7. move JPx (open), resistor 15Kohm
  8. check Blank again
  9. load DATA
  10. click Icon Program
  11. End
SST Chip (27SF256/512/010/020)
  1. Cut trace PCB U5A(pin 12) to ZIF32(pin 26) and add part figure. 1
  2. Settting Vpp = 12.5V
  3. Run program Eprom.exe
  4. Select Device W27E512
  5. Short JPx (close)
  6. Click Icon Erase (It will Erase and check blank)
  7. Move JPx (open)
  8. Check Blank again
  9. Load DATA
  10. Click Icon Program
  11. End