Okay so I went down to the shop annnnnnd... Yeah still doing what it did before. Repair guy thought the flash when he turned it off meant the screen was ok. He did say he checked the display board thoroughly and replaced a bad IC - otherwise everything looked good there.
So we had a poke around and I showed him how the voltages on the motherboard drop to almost zero when the wire that goes to the display board is plugged in on power up. He followed it and noted that in fact, some of the wires on that cable go further back into the machine. So he's going to trace that. Come to think of it, I wonder if that's why the screen isn't flooding when that cable is plugged in.. maybe the same thing that is shutting down the motherboard is also shutting down the monitor? Hopefully it proves to be something simple. -----Original Message----- From: cctalk [mailto:cctalk-boun...@classiccmp.org] On Behalf Of Randy Dawson via cctalk Sent: Tuesday, October 3, 2017 8:43 AM To: Bob Rosenbloom <boba...@sbcglobal.net>; General Discussion: On-Topic and Off-Topic Posts <cctalk@classiccmp.org> Subject: Re: Tektronix 4050E01 Hi Bob, I have a 4051, in perfect working order. I would like to buy one of these 'Toasters' from you. I could also take your schematic and make more copies of it for others. What ROMPACKS do you have? Randy ________________________________ From: cctalk <cctalk-boun...@classiccmp.org> on behalf of Bob Rosenbloom via cctalk <cctalk@classiccmp.org> Sent: Monday, October 2, 2017 8:24 PM To: General Discussion: On-Topic and Off-Topic Posts Subject: Tektronix 4050E01 I'm looking for the schematic of a Tektronix 4050E01 ROM expander (toaster). This is the one that works with either the Tektronix 4051 or 4052/4054 units. Different than the 4051E01. I have a few to fix. Anyone have a manual for one that they could scan? Thanks, Bob -- Vintage computers and electronics www.dvq.com<http://www.dvq.com> [http://banners.wunderground.com/cgi-bin/banner/ban/wxBanner?bannertype=pws2 50&weatherstationcount=KCASANTA382]<http://www.dvq.com/> dvq.com<http://www.dvq.com/> www.dvq.com Like Microcomputers? Apple 1's? Visit the Microcomputer Museum in Virginia. You can send mail to DVQ via: info (at) dvq (dot) com www.tekmuseum.com<http://www.tekmuseum.com> [http://tekmuseum.com/images/tek-museum001002.jpg]<http://www.tekmuseum.com/ > Home [tekmuseum.com]<http://www.tekmuseum.com/> www.tekmuseum.com This website has been created with technology from Avanquest Software. www.decmuseum.org<http://www.decmuseum.org> [http://decmuseum.org/image/obj123geo101pg1p11.jpg]<http://www.decmuseum.org /> DEC Computers<http://www.decmuseum.org/> www.decmuseum.org A collection of vintage Digital Equipment Computers. DEC Minicomputers in my collection. The collection starts with a "Straight 8", the basis for all later PDP-8 ... --- This email has been checked for viruses by AVG. http://www.avg.com
