Re: Apple Lisa 2/5 I/O Board COPS Error

Compu-85, thank you for your help. Your comments helped me to repair my board. When you said R46, I started looking at that area. The problem was the via that I have the arrow pointed to. I did not think to check it, since the tracing tested fine. I ran a small wire through the via, and the board works! On a side note, I still need noob help learning how to check the voltages!

On Thursday, November 30, 2017 at 5:25:52 PM UTC-8, austj..._at_email.domain.hidden wrote:
>
> Comput_85 thank you for your comment, and previous ones also. I'm having a
> hard time figuring out how to actually check for voltage. I have a simple
> multimeter. Do you use both the red and black lead? Sorry for my ignorance.
> I'm still learning.
>
> On Thursday, November 30, 2017 at 4:35:55 PM UTC-8, austj..._at_email.domain.hidden
> wrote:
>>
>> My Apple Lisa 2/5 I/O board gives me a COPS chip error. I tested the chip
>> in another I/O board it works just fine. I switched out the socket. I
>> checked for continuity on each pin in the new socket. I have checked every
>> single tracing that connects to every pin of the COPS socket, all test fine.
>>
>> The computer starts just fine with another I/O board.
>>
>> Symptoms, the computer powers on the second power is turned on. I don't
>> have to push the power button. It just double beeps and gives I/O board
>> error 52.
>>
>

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