PDT-11/150 down

Well, this is my first post to the list in quite a while; most of you may not even remember me... but I have been lurking. Now I have a problem I need help with. I have a PDT-11/150HC, the dual drive model with 32KW and the 3 extra serial ports. It had been working fine, up through last year, when I stored it. I was working on another project, building a PDP-11/53 from a DECServer 550 (like Jonathan Engdahl's) when I needed to copy some floppies. I brought out the trusty old PDT, and of course, it wouldn't work. I am using a VT420 with DECConnect wire and shells to talk to the PDT. The VT and wires are all known good, tested with other equipment. What happens is that when I turn the PDT on and type the 2 "@" characters to set the baud rate (4800), the #2 led properly goes out, the RUN led comes on, but NOTHING comes back to the terminal. Thinking that I needed a NULL MODEM in the cable, I put a MMJ crossover connector block between the terminal and the PDT. Strangely, I had exactly the same results - nothing out on the monitor - with TX and RX swapped how the heck does this happen? As I recall, the usual response is something like "Press B to Boot". In any event, pressing "B" does nothing either. I have performed the self test with the lid off and modules elevated and the result was that the first 4 LED's on the Intelligence Module came on. This is result #17, indicating that either the DISK Controller Module or Cable G1 has failed and need to be replaced - impossible, at least in the case of the Disk Module. Besides, what does this have to do with no response on the terminal? My next step is to test the power supply and trace power to the various modules, as per the Mini-Maintenance manual. I'm hoping that someone on the list is more familiar with the PDT and can offer useful suggestions that might shorten an exhaustive troubleshooting effort - I'm not really up to it. I have as resources 3 books, 1) The PDT 11/150 User Guide (EK-PT150UG-001), 2) The PDT 11/150 Installation Guide (EK-PT150-IN-002), and 3) The PDT 11/150 Mini-Maintenance Hardware Guide (EK-PT150-J1-002). I would very much like to get a copy of EK-PT150-TM, the Technical manual, in print or PDF format. I also have the usual DVM, a Tektronix 2215 dual channel scope, and the memories of being an electronics technician (with a radiotelephone license) during my late 20's, a lifetime ago. I spent the last 20 years of my so-called career as a systems programmer and am now retired. Can someone that knows about the PDT assist me? All useful input appreciated! Stuart Johnson Ssj152 AT charter DOT net Old man, Old hobby