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[SOLVED] problem facing me in 89 series programmer -atmel-

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hassan ali

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i made a 89 series programmer for sunrom , but i face a problem ,
the (proload ) read the programmer but it didn't erasing , i want to know what is the problem i gussied that the problem in the zinner (5.6 , 12 v) but please i wanna to know what is the voltage in the nomial case befrore erasing at zinners

comment: sometimes the proload can't dectect the chip , please i want the solution quickly
 

measure the voltage at your power source coming in to the programmer.

Should be at least 13.5V.
 

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    hassan ali

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i measured it , it about 14 v
so what is the problem now???
when i measure the voltage on zinner 5.6v it give me 5.6v and when i measure the voltage on zinner 12v it gives me 5.5v ,if there are a problem ?????

comment: can i replace Bc547 to Bc557????
 

hassan ali said:
can i replace Bc547 to Bc557????
Click to expand...
Ahh..i was about to suggest you the same. The two 547 and 557 are totally different. One is NPN and other is PNP. Cross check wether you have not used 557 in the 547's place ot soldered in reverse directions. After all you get the schemtaic of Sunrom programmer. Just refer it and see why are you not getting 12 volts. Cheers and good luck.
 

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    hassan ali

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no, you cannot use 557 in place of 547. check ur circuit may be ur zener diode has wrong value

regards
kj
 

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    hassan ali

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so the problem sure in the zinner diode , are u agree with me???
or u suggest another thing, any way really thank u for ur kindly.
 

Most of the times the problem is wrong connections, short circuits & improper soldering.

Check, double check the hardware

Nandhu
 

    H

    hassan ali

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pranam77 said:
The two 547 and 557 are totally different. One is NPN and other is PNP. Cross check wether you have not used 557 in the 547's place or soldered in reverse directions.
Click to expand...
No i never said that. Did i? Read my reply again. Mostlike ly problems are as "nandhu015" has said. Cross check at your end.
Cheers
 

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    hassan ali

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