At 15:06 -0700 8/6/10, willy wrote: >I need to identify a P.S. mod. 699-0133, >the label on side says; Dyna Comp Inc, >+5V 4A, +12V 1A, -5V .25A, -12V .25A >It is sick so I need schematic. >Thanks
That looks like 36 watts which is tiny by modern standards. Give us a hint about what it's from. Did it come from Apple? But schematics for such things are rare indeed. Using an isolation transformer the first thing to check is the rectified line voltage which ought to be a few hundred volts. Input capacitors can be shorted causing a fuse to pop or the bridge rectifier can be kaput.. After that it's either a failure of the high frequency power transistor that drives the power transformer or the integrated circuit that controls it. Even if you had the schematic finding those old parts can be a nightmare. Sometimes you can read the part number of the controller chip and find a datasheet for it. It's likely that the recommended circuit for the chip looks a whole lot like the final product. If you're lucky you might find a bad solder joint. In those days reflow soldering tended to be set for the small joints. The larger ones didn't get hot enough and proceeded to develop cracks. Fixable with a soldering iron and some rosin flux. -- --> Halloween == Oct 31 == Dec 25 == Christmas <-- -- ----- You received this message because you are a member of the Vintage Macs group. The list FAQ is at http://lowendmac.com/lists/vintagemacs.shtml and our netiquette guide is at http://www.lowendmac.com/lists/netiquette.shtml To post to this group, send email to [email protected] To leave this group, send email to [email protected] For more options, visit this group at http://groups.google.com/group/vintage-macs Support for older Macs: http://lowendmac.com/services/
