newman@suncis.ycc.yale.edu (Andrew Newman) (02/14/90)
Greetings: There has been a lot of talk lately about 3B1 power supply availability. As I understand it Halted no longer has any of the 3B1 pwr. supplies left in stock. Does anyone have a source for these items? If not, does anyone wish to offer a voltage pin-out for the power supply connector? I figure in the worst case I could kludge up some sort of external power supply if mine were to fail (it hasn't yet!). Finally, what are the odds of using a 7300 power supply in a 3B1? Does anyone actually know what the differences are? -Andy Newman
julian@bongo.UUCP (julian macassey) (02/14/90)
In article <87.25d7fc59@venus.ycc.yale.edu>, newman@suncis.ycc.yale.edu (Andrew Newman) writes: > Greetings: > > There has been a lot of talk lately about 3B1 power supply availability. > As I understand it Halted no longer has any of the 3B1 pwr. supplies left > in stock. Does anyone have a source for these items? If not, does anyone > wish to offer a voltage pin-out for the power supply connector? I figure > in the worst case I could kludge up some sort of external power supply if > mine were to fail (it hasn't yet!). > > Finally, what are the odds of using a 7300 power supply in a 3B1? Does anyone > actually know what the differences are? > Yes, I have a couple of 3b1 PSUs stashed in my garage, I thought ahead and bought ahead. I could part with one or two at a suitably exorbitant rate. Furthermore, I glanced through my files and found some info that may be pertinent: I just got this mail message from Thad Floryan (thad@cup.portal.com): =================================================================== UNIXPC POWER SUPPLY PINOUTS 18-Pin Connector . . . | O O O O O O O O O O O | BLK [ YELLOW ] BLK [RED] [ BLK ] | +------------------------------------------------------+ | | O O O O O O O O O O O O O O O O O O | | +------------------------------------------------------+ | 18 J1 *-----------* *---------* 1 +------------------------------------------------------------... +5 VDC is commoned to pins 2, 4, 6, 8 and 10 is also commoned to the two (2) holes marked [RED] +12 VDC is commoned to pins 12, 14 and 16 is also commoned to the four (4) holes marked [YELLOW] -12 VDC is available at pin 18 GROUND is commoned to pins 1, 3, 5, 7, 9, 11, 13, 15 and 17 is also commoned to the five (5) holes marked [BLK] ------------------------------------------------------------------ POWER SUPPLY RATINGS Power Systems, Inc. System Model Number Convergent Part No. +5 V +12 V -12 V ------ ------------------- -------------------- ---- ----- ------ 3B1 PS 1610-1 D-65-00056-1, Rev. B 20 A 5.0 A 300 mA 3B1 PS 1610-1 D-65-00056-01, Rev. A 20 A 5.0 A 300 mA 7300 PS 1569 D-65-00042-00, Rev. E 20 A 3.5 A 100 mA 7300 PS 1569 D-65-00060-01/A 20 A 3.0 A 300 mA The 3B1 supplies have the AC rating: 90-130 VAC, 58-63 Hz, 245 W The 7300 supplies have the AC rating: 90-130 VAC, 58-63 Hz, 195 W Lenny Tropiano ICUS Software Systems [w] +1 (516) 589-7930 lenny@icus.islp.ny.us Telex; 154232428 ICUS [h] +1 (516) 968-8576 {ames,pacbell,decuac,hombre,sbcs,attctc}!icus!lenny attmail!icus!lenny ------ ICUS Software Systems -- PO Box 1; Islip Terrace, NY 11752 ------ Re: Wolf Paul's questions (my answers posted since they seem to be of general interest) ... Q: "1. Does a 3b1 PS fit into a 7300?" A: It should. Both supplies have the same mounting hole arrangement and appear to be the same height, so vertical clearance should be OK for either a 7300 or 3B1 case. Q: "2. Are there 220VAC or 240VAC versions of these power supplies available? (I just bought a 7300 and it looks like I will be moving to Europe at year's end.)" A: The AT&T UNIX PC REFERENCE MANUAL (the book with all the schematics) has an appendix "International Version" in which is stated: "The electrical specification for this equipment is 220-240 volts." In general, many switching power supplies have a single jumper that permits primary operation on either 120VAC or 240VAC. Having just returned from the West Coast Computer Faire in which I was demo'ing the UNIXPC for the past 3 days in the AT&T Computer Users' Group booth, I'm pooped and unable to open one of the machines right now to see if there IS a jumper on the UNIXPC's power supply. HOWEVER, rest assured that you can operate your UNIXPC in Europe using a step-down transformer (external device), and my original doubts concerning problems with a line frequency of 50 Hz have been cast aside due to the successful operation of a 3B1 by Jim Sanchez of SYTEK in Brussels since January 1988; his system has been (and still is!) operating 24 hours/day. If you'd like Jim's email (uucp) address (via SYTEK in Mountain View, CA), let me know; Jim enjoys correspondence and can tell you the mfr and model of the stepdown transformer he's using. Q: "3. Do you have an address where one can order one of these babies?" A: Although I'm not certain this is the same subcontractor who mfd'd the UNIXPC's power supplies, I have found this entry in one of my various buyer's guides: Power Systems, Inc. 12 Tobey Road Bloomfield, CT 06002 ph: 203/243-0357 TWX: 710/425-8778 In case news has "expired" at your site, repeating the original info: The 3B1 power supply is mfd by Power Systems, Inc. and is their model PS 1610-1 (Convergent part number D-65-00056-1, Rev. B). Its specs: 90-130 VAC, 245 Watts, 58-63 Hz +5 VDC at 20 Amps +12 VDC at 5 Amps -12 VDC at 300 mA The 7300 power supply is also mfd by Power Systems, Inc and is model PS 1569 (Convergent part number D-65-00042-00, Rev. E). Its specs: 90-130 VAC, 58-63 Hz +5 VDC at 20 Amps +12 VDC at 3.5 Amps -12 VDC at 100 mA Thad Floryan [ thad@cup.portal.com (OR) ..!sun!portal!cup.portal.com!thad ] Many thanks to Thad and Lenny for the above info. -- Julian Macassey, n6are julian@bongo.info.com {ucla-an!denwa!bongo!julian N6ARE@K6IYK (Packet Radio) n6are.ampr.org [44.16.0.81] voice (213) 653-4495