Lady Bug repair help - Fluke 9010a Bus Test bounces

banane

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Hi,

I'm trying to repair a lady bug (single board) pcb and just connected for the first analyses my fluke 9010a with a Z80 marian pod.
On other Z80 boards the pod works fine, by the way.

Here on the lady bug board when I do a simple bus test it just continously toggles between "BUS TEST WAIT" and "POD TIMEOUT - ATTEMPTING RESET".

Also I notice:
d000-d3ff video RAM - RAM test okay
d400-d7ff color RAM - at D400 already R/W ERROR BTS - E0 LOOP

I know I now could have a look at the 11100000 ... but where would you start to debug further ? I am a bit confused about the bus test.

Thanks for any advice,
Christian
 
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