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Don't be too discouraged if you can't find a tech willing to help you wire up a 515. Many interconnects simply no longer handle 1A2, others that do won't touch residential work [for a variety of reasons].
The good news is, I am almost certain that the folks on this forum can help you get hooked up. Providing detailed information to users of modern systems is discouraged here, but 1A2 is different, mainly because it is seen so rarely anymore in a commercial setting. This forum has more 1A2 experts than you will find anywhere else on the web, and they are always willing to help.
Start by grabbing some documentation for your system:
Take a look at the docs, and then feel free to ask questions here. You may need to post some pics of your equipment, if there is anything unusual going on such as previous modifications to the wiring.
I am not a 1A2 expert by any means, but if I needed help with one, this is the place!
Good luck in your endeavors,
Jim Bennett ================================================== "He who throws mud only loses ground." -Fat Albert
The shoebox is a 551 KSU. The theory of operation and wiring is almost identical in a 513/514/515 KSU.
You need to look at the BSP (518 - 215 - 405) and then find the incoming T&R terminals for the slot(s) that you intend to use, and then find the output T,R,A,A1,LG and L leads for those slots.
Check out the diagram on page 27 and you should be able to see enough info for a couple of CO lines.
Do a Google search for the following "BSP 515 KSU TCI"
Arthur P. Bloom "30 years of faithful service...15 years on hold"
The 515 was the predecessor to later ComKey designs with regard to KSUs. They were truly meant to be goof-proof. There is no doubt that following the aforementioned BSPs will put you on the right path. As Jim said, we do love to play with this stuff and make it work magic, so you have found the right place for support.
In the BSP that I suggested that you download, in Figure 1, you will see that you have a 513 type KSU. The right hand side expansion unit is a 514, and the entire assembly is called a 515.
The fuses are to be installed on the fuse block at the top of the unit.
In the BSP, Figure 3 shows the names and placement of the three 66-type blocks. This diagram shows you what they look like, where they are, and how to count the pins.
In Figure 8, it shows you where the T,R,A1,A,LG & L leads are terminated for each line.
Only telephones designed to work with this system will work. They are 565, 2565, 831, 2831, 851, 2851, etc, WE or equivalent 1A2 key telephones. Single-line (500- and 2500-type) telephones will work, if they are converted for A-lead control. What type phones are you planning to use?
Arthur P. Bloom "30 years of faithful service...15 years on hold"
