Path: utzoo!attcan!uunet!lll-winken!lll-tis!helios.ee.lbl.gov!pasteur!ucbvax!RADC-LONEX.ARPA!koziarzw From: koziarzw@RADC-LONEX.ARPA Newsgroups: comp.sys.zenith.z100 Subject: (none) Message-ID: <8807151829.AA02236@radc-lonex.arpa> Date: 15 Jul 88 18:29:06 GMT Sender: daemon@ucbvax.BERKELEY.EDU Organization: The Internet Lines: 67 Mail to: info-hz100@radc-tops20.arpa Date: Fri Jul 15 14:28:15 1988 From: koziarzw@radc-lonex.arpa Sender: koziarzw@radc-lonex.arpa Subject: HZ100+Z217 with OLD power supply cc: none Message: I thought that some of you other Z100 persons might find this item of benefit. Some time ago, Gern posted a description of the HZ100 power supply and mentioned that there was no (apparent) difference between the old (BLACK CASE) and the newest (GOLD CASE) powersupplies, except that the older supplies lacked the four conductor cable leading to the Z-217 card. If you have access to a Winchester, a Z-217 controller, and data seperator but your Z100 has an old power supply, you can add the cable required. BE SURE YOU ARE CAREFUL WHEN WORKING ON THE POWER SUPPLY, THEY ARE VERY EXPENSIVE TO REPLACE!!!!!!!!!!!!!!!!! Using Gern's posted power supply description, the power supply schematic, the Z100 technical manual and good judgement and common sense procede as follows: 1) Remove the power supply from the Z100 2) Remove the power supply cover 3) Locate the area of the power supply circuit board to which all the RED WIRES lead, this where you will add one or two wires. a) Using a SMALL drill, (to accomodate a 18AWG wire) drill two holes in the SAME AREA OF COPPER AS ALL THE OTHER RED WIRES are soldered to. Alternatively, you can drill one larger hole to accommodate one 12AWG wire. b) Using STRANDED wire, solder one or two pieces into the holes you just drilled. They should have RED insulation!!!!! c) Locate the two EMPTY circuit board holes for GROUND wires. d) Insert and solder one piece of BLACK INSULATED 18(or larger)AWG wire into each of these empty holes (you may first need to clean the holes of solder; use a 'solder sucker', a solder wick, or any other de-solder tool that you might have) 4) You have added two ground return wires (BLACK INSULATION) and one (12AWG) or two (18AWG) RED insulated +5V. wire(s) 5) Re-assemble the power supply cover and re-install the power supply in the Z100. BE CAREFULL TO AVOID SHORT CIRCUITS!!!!!!!!! PUT NEW HEAT GREASE ON THE SMALL VOLTAGE REGULATORS THAT FASTEN TO THE POWER SUPPLY HOUSING!!!! 6) Obtain from any local electronics supplier the necessary connector. a) The wires are installed in RED, BLACK, BLACK, RED into the connector. b) Turn on the computer and verify +5V at the RED wires. 7) If any part of this discussion does not sound like something you want to, then DO NOT DO IT!!!!!! This should be performed only by persons familiar with printed circuit board modification/maintenance procedures. I hope that this description is sufficient to allow those with old power supplies to add winnies to their systems, I did indeed perform the addition described here-in on my own machine with no ill effects. Please bear in mind that I have printed circuit board experience (I am E.E. and Elec. Tech.) Cheers, Walt K.