Muttley Black
Experienced Member
Hello all.
Yesterday i got my one and only Apple II Europlus with motherboard (820-0001-07).
I buy it as faulty. Today was the day to start up my effort to repair it. First it has exploded one Rifa inside the power supply that i replace it. I did the same with the second one that was inside. I measure the voltages and all was ok. Every IC is in socket so, i take out every ic one by one i clean the legs and i put them back. I find some that was faulty. That was: A2/74LS00, B6/74LS257, B7/74LS257, B8/74LS174, D13/74LS161 and D14/74LS161. I test every ram IC 4116 and all are in working order.
After all the above i decide to switch it on. What i got is that:
What unusual i saw in this machine is one card that looks like hand made. This card connect with one other card that is behind the keyboard. Both card pugged with IDT plugs to A5/SPCL Rom socket, c9/ram socket and A7/keyboard socket. That's mean that original SPCL Rom it is not present. I don't know what this card do and i don't know also if that mod card is responsible for the video issue.
Here are some photos:
Thank you and sorry for my poor English and that i upload photos with imageshack. I dint find solution with forum uploader
Yesterday i got my one and only Apple II Europlus with motherboard (820-0001-07).
I buy it as faulty. Today was the day to start up my effort to repair it. First it has exploded one Rifa inside the power supply that i replace it. I did the same with the second one that was inside. I measure the voltages and all was ok. Every IC is in socket so, i take out every ic one by one i clean the legs and i put them back. I find some that was faulty. That was: A2/74LS00, B6/74LS257, B7/74LS257, B8/74LS174, D13/74LS161 and D14/74LS161. I test every ram IC 4116 and all are in working order.
After all the above i decide to switch it on. What i got is that:
What unusual i saw in this machine is one card that looks like hand made. This card connect with one other card that is behind the keyboard. Both card pugged with IDT plugs to A5/SPCL Rom socket, c9/ram socket and A7/keyboard socket. That's mean that original SPCL Rom it is not present. I don't know what this card do and i don't know also if that mod card is responsible for the video issue.
Here are some photos:
Thank you and sorry for my poor English and that i upload photos with imageshack. I dint find solution with forum uploader