ichiro@codon4.berkeley.edu (07/06/89)
Today I upgraded an SE to 2.5 megabytes using SIMMS from Technology Works. Everything went fine considering that this was the first time I'd opened up a Mac, but after booting the machine I noticed that the speaker was behaving erratically. Sounds would begin but would then be cut short or degenerate into static. Sometimes I couldn't get any sound at all. I opened the case again and checked the speaker cable connection, but everything appeared to be in order. The problem was still there when I started it up again. Setup: 2.5 megabyte SE running System 6.02 (problem occurs under both Multifinder and Unifinder) A coworker suggested that there might be some oxidation particles on the contacts. From experience with stereo hookups this makes sense, but I wonder if anyone out there might have had a similar experience. If anyone does have any experiences or suggestions, then please e-mail them to this account and I'll post a summary to the net. Thanks in advance, Elliot Wilen ichiro@enzyme.berkeley.edu ...ucbvax!enzyme!ichiro
ichiro@codon3.berkeley.edu (Elliot Wilen) (07/15/89)
In article <26039@agate.BERKELEY.EDU> I wrote: >Today I upgraded an SE to 2.5 megabytes using SIMMS from Technology >Works. Everything went fine considering that this was the first time >I'd opened up a Mac, but after booting the machine I noticed that the >speaker was behaving erratically. Sounds would begin but would then be >cut short or degenerate into static. Sometimes I couldn't get any sound >at all. I opened the case again and checked the speaker cable >connection, but everything appeared to be in order. The problem was >still there when I started it up again. > >Setup: 2.5 megabyte SE running System 6.02 (problem occurs under both >Multifinder and Unifinder) > >A coworker suggested that there might be some oxidation particles on >the contacts... First off, I should explain that the problem went away after a day or so of use, which makes me think that it was indeed just a matter of oxidation particles. But I did get several responses which might alert people to some of the hazards to avoid when working inside the Mac. Mark H. Anbinder (mha@tcgould.TN.CORNELL.EDU) suggested that I could have punctured the the paper speaker cone with the pin on one of my SIMMs. This definitely is something to watch out for, since the SIMMs on an SE are mounted right next to the speaker, and the 1 Meg SIMMs I got are also a little bit wider than the 256k ones which came with the machine. Stephen Sakamoto (steph@cs.ucla.edu) mentioned that there might be oxidation particles in the external audio connector, instead of the internal cable connection. Since the contacts in the jack act as a switch to disconect the internal speaker, oxidation there could cause the internal sound to go out. He suggested that I plug an external speaker into the jack to see if the Mac was okay, then (if that worked) try inserting and removing the plug a few times to clear any oxidation. Clark Anderson (anderson@apple.com) wrote that I might have blown the sound chip with static while doing the upgrade. Thankfully this does not appear to have happened, but the possibility is certainly something to watch out for. Thanks to Mark, Stephen and Clark for replying to my request for help! --Elliot Wilen