Dictaphone Model: 7120...Power Supply Part#: 870403 fried one of the Voltage Regulator IC's. I am looking for a Schematic or Service Manual for this unit. It seems as if the company disappeared from the planet. If I can get this documentation, I could Identify the part and repair the unit. Taking a guess could be more expensive. I am willing to pay for the Service Manual.

Hello there,
At times companies that produce devices like this tend not to put the manual online and efforts to try to get it through some other users upload might be difficult as well. The solution is for you to simply just disassemble the device and try to locate the fried regulator.
That way, you will be able to solve the problem, The moment you disassemble the device, you will be able to detect where the problem is from and know how to solve the problem from there.
Most times, the service manual just do not give prescription and direction on how to repair problems like this as the kind of solution the proffer there are basically common problem that requires just pressing just one button or the other on the device.
Try to disassemble it, that way you will be able to diagnose, detect and fix the problem as the case may apply. But if you do not want to disassemble it, you can get it to a repairman to have it checked and fixed for you in order to save you the expense of a guess work.
Hope this information was helpful to you. Goodluck. Elect_Comp