Modify circuit for Erase data W27Exxx ,W27Cxxx, SST27SFxxx, MX26C4000

Figure 1. cut trace and add part

WinBond Chip (W27E512,W27E010,W27C010,W27C020,W27C040)

1. Cut trace PCB U5A(pin 12) to ZIF32(pin 26) and add part figure. 1
2. Settting Vpp ~= 15V (diode dorp 0.7V) Real voltage to taget chip = 15-0.7 = 14.3V

- 1N4148 = 0.7V, 1N4001 = 0.6V

3. Run program Eprom.exe
4. Put CHIP W27xxxx,W27Cxxx
5. Select Device W27Exxx,W27Cxxx
6. short JPx (close)
7. click Icon Erase (It will Erase and check blank)
8. move JPx (open) and Resistor 15Kohm
9. check Blank again
10. load DATA
11. click Icon Program
12. End

SST Chip (27SF256/512/010/020/040)
(37VF512/010/020/040)

1. Cut trace PCB U5A(pin 12) to ZIF32(pin 26) and add part figure. 1
2. Settting Vpp ~= 12.75V (diode dorp 0.7V) Real voltage to taget chip = 12.75-0.7 = 12.05V
3. Run program Eprom.exe
4. Put CHIP SST27SFxxx
5. Select Device SST27SFxxx
6. Short JPx (close)
7. Click Icon Erase (It will Erase and check blank)
8. Move JPx (open)
9. Check Blank again
10. Load DATA
11. Click Icon Program
12. End

(MX26C4000)

1. Cut trace PCB U5A(pin 12) to ZIF32(pin 26) and add part figure. 1
2. Settting Vpp ~= 12.75V (diode dorp 0.7V) Real voltage to taget chip = 12.75-0.7 = 12.05V
3. Run program Eprom.exe
4. Put CHIP MX26C4000
5. Select Device MX26C4000
6. Short JPx (close)
7. Click Icon Erase (It will Erase and check blank)
8. Move JPx (open)
9. Check Blank again
10. Load DATA
11. Click Icon Program
12. End