baum@Apple.COM (Allen J. Baum) (11/15/89)
[] >In article <1989Nov14.134706.7858@uncecs.edu> hunnic@uncecs.edu (Jeff Hunnicutt) writes: > >I have a Mac Plus that exhibits the symptom of a single vertical >line up the middle of the screen. My question is this, does anyone >know what particular component may be failing? I've been informed that the usual cause for that problem is the failure of a 3.9uf 25v non-polarized capacitor. Its about 1.25" high, .5" diameter, near the top of the board, component number C1. -- baum@apple.com (408)974-3385 {decwrl,hplabs}!amdahl!apple!baum
gordon@cs.washington.edu (Gordon Davisson) (11/17/89)
>In article <1989Nov14.134706.7858@uncecs.edu> hunnic@uncecs.edu (Jeff Hunnicutt) writes: >>I have a Mac Plus that exhibits the symptom of a single vertical >>line up the middle of the screen. My question is this, does anyone >>know what particular component may be failing? In article <36480@apple.Apple.COM> baum@apple.UUCP (Allen Baum) writes: >I've been informed that the usual cause for that problem is the failure of >a 3.9uf 25v non-polarized capacitor. Its about 1.25" high, .5" diameter, >near the top of the board, component number C1. C1 failure generally won't collapse the display all the way down to a single line. The problem is more likely to be a bad solder joint on the yoke connector; it's the 4-pin connector near the top front of the analog board, right underneath one of the foam tape pads that hold on the insulating sheet. A bad connection on either of the top two pins will cause the described symptoms, though the top one almost always goes first. (Actually, it's a good idea to resolder all four pins; they'll all go eventually) -- Gordon Davisson Westwind Computing (206) 632-8141 4518 University Way NE, Suite 313, Seattle WA 98105