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VP-280 Fails Self Test and cannot write Reply  
handsome
JoeMay
 I have a VP-280 that fails the self test and it fails on writing.
I can test logic chips, upgrade the system version and even downgrade the system version.
I was even able to do a blank check and that worked.

All read commands seem like they work, but I cannot write to any eprom.
a simple 27c256 fails.

I checked all three voltages:
5v = 3.73 low?
12v = 12.02
21v = 21.08


The self error test I am getting goes like this:
P31 input is high!
P5 VPP output is high!
P9 Vpp output is high!
P11 Vpp output is high!

etc...

Please advise!
Thanks,
Joe

[ The message is modified by JoeMay ]
[ The message is modified by JoeMay ]
[ The message is modified by JoeMay ]
Go back list [ Posted:2011-09-21 04:22:17 ] Edit Administer top

Re:VP-280 Fails Reply  
handsome
hlark
 Can you solder? Maybe there is a transistor that goes bad.It is V19,which is SS8550, PNP,25V/1.5A.You can find it on the bottom surface of the top board,you can open the cabinet.
Go back list [ Posted:2011-09-21 09:13:33 ] Edit Administer Top

Re:VP-280 Fails Self Test Reply  
handsome
JoeMay
I will solder a new SS8550 on to V19 and let you know!

Thank you!
Joe
Go back list [ Posted:2011-09-21 11:23:07 ] Edit Administer Top
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