Re: Legible schematic of motherboard?

clean schematics are on ray's page:
http://lisa.sunder.net/cgi-bin/bookview2.cgi?zoom=0?image=0?book=6

On 16 avr, 04:21, snhirsch <snhir..._at_email.domain.hidden> wrote:
> Does anyone have a readable copy of the motherboard schematic? ÊI
> found one in the Lisa technical manual PDF, but it's largely
> illegible. ÊIt also appears incomplete. ÊI'm trying to troubleshoot a
> no-display problem after replacing the wiring harness. ÊI have raster
> with the brightness cranked up which means high-voltage, hsync and
> vsync are being delivered. ÊI also have video at the RCA jack on the
> rear panel. ÊThat narrows it down quite a bit. ÊThe schematic shows
> two transistors that buffer the RCA composite output and (I think)
> blend in sync. ÊHowever, the PCB has a TTL chip near the power/video
> connector that I cannot locate on any of the schematics. ÊI _think_
> this chip is part of the "fade out" logic, but need to understand a
> bit more about the circuit.
>
> Can anyone help?

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