Path: utzoo!utgpu!jarvis.csri.toronto.edu!mailrus!wuarchive!gem.mps.ohio-state.edu!apple!sun-barr!newstop!sun!cyclone!rayl
From: rayl%cyclone@Sun.COM (Ray Lamoreaux)
Newsgroups: comp.sys.amiga
Subject: Re: Failure of clock on A501
Summary: Schematic location
Message-ID: <125962@sun.Eng.Sun.COM>
Date: 6 Oct 89 21:38:29 GMT
References: <8910041535.AA01001@astro.psu.edu>
Sender: news@sun.Eng.Sun.COM
Lines: 26


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> Workbench 1.2, it says "battery backed-up clock not functional"  I took
> it to my local repair place, but they said there aren't any schematics for
					     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
> it so they couldn't fix it.  Any suggestions?  I checked the battery and
  ^^^^^^^^^^^^^^^^^^^^^^^^^^


	Try looking in Appendix F of the A500 Manual (Introduction to
	the AMIGA 500).  Page F-11 has a schematic of a 512k expansion
	ram card with a battery backed up clock (looks a lot like an
	A501 schematic to me).

	In fact, I used this schematic to build my own 512k memory
	expansion.  (haven't built the clock circuit yet though).

	I warn you however, that the schematics im my A500 manual
	(copyright 1987) are not entirely accurate. (at least they
	do not exactly match the circuitry in the A500 which the manual
	came with)


	-Ray