Path: utzoo!utgpu!news-server.csri.toronto.edu!rpi!think.com!mintaka!ogicse!milton!sumax!halcyon!raoul From: halcyon!raoul@seattleu.edu Newsgroups: comp.sys.mac.hardware Subject: Re: Mac Analog Board Problem??? Message-ID: Date: 26 Jun 91 01:51:59 GMT Article-I.D.: halcyon.cPL541w164w References: <45160001@hpindda.cup.hp.com> Organization: The 23:00 News and Mail Service Lines: 38 ash@hpindda.cup.hp.com (Art Harkin) writes: > > My MacPlus (upgraded from a Mac 512K) seems to be having > power supply problems. My screen brightness controller has to > be set to its lowest setting to make the screen be at its > correct brightness (otherwise, its too bright). > Also, I was having modem problems (one of them my have burned > out) and it may because of too high of a voltage being sent > over the RS232? The modems work okay with another Mac. > > I tried to get readings off the power supply to see if > its providing to much 5V or 12V, but it didn't seem so. > But, I do not have a schematic or checkpoints to totally > verify this. > > Is this a common problem in older macs? > Is it fixable, the voltage adjustment knob did not seem > to help too much. > > Is it possible to get an analog board for a Mac Plus > at a reasonable cost anywhere (in south SF bay area)? > > Thanks in advance, (replying by email will be fine) > > Art Harkin > > ash@cup.hp.com This is ery common to early Macs. Get a new analog board/pwr supply and the problems will be gone. No cheaper way that I know. Jeff. -- The 23:00 News and Mail Service - +1 206 292 9048 - Seattle, WA USA PEP, V.32, V.42 +++ A Waffle Iron, Model 1.64 +++