My bad... looks like A5 is a resistor network and should be on during self test. -Adam
From: "Adam Courchesne" <ajcrm125@hotmail.com> To: Eggwheatis@aol.com CC: techToolsList@flippers.com Subject: Re: 6809 pod problems Date: Tue, 15 Jul 2003 13:12:46 -0400
It's low on the input and output of A5 because that interface IC only fires up when you are no doing self test. When you are doing self test, it gets its clock from the socket, which gets them from U22. U22 gets enables when you flip that switch to 6809E. And the input clock source to U22 comes from a clock divider (U21) that is clocked by by U23. So..... put the CPU connector in the socket and look at U22. If the output is low is it enabled? Is the input low? If it is is the clock divider running? If U22 is enables and the input is toggling but the output is low the I would suspect that the 6809E you are using in the micro socket might have gone bad is is pulling those lines low.
Lemme know what you find... -Adam
From: Eggwheatis@aol.com To: ajcrm125@hotmail.com Subject: Re: 6809 pod problems Date: Tue, 15 Jul 2003 12:32:03 EDT
Hi Adam, Ok well the latest is I've been checking the clocks...The E clock is held low at the processor...The self test socket seems to output the Q and E clock ok, but as soon as you plug the the CPU connector in the self test socket it holds the E clock low. It's low on the input and output of A5 the custom interface(protection?) IC. What do you think?
I really appreciate your time!
Phil.
_________________________________________________________________ Add photos to your messages with MSN 8. Get 2 months FREE*. http://join.msn.com/?page=features/featuredemail
_________________________________________________________________ Protect your PC - get McAfee.com VirusScan Online http://clinic.mcafee.com/clinic/ibuy/campaign.asp?cid=3963