Hi Dave and welcome to JustAnswer,Thank you for the question and your patience. Should you still need assistance for information purposes only...Initially, are you then considering a DIY (do-it-yourself) repair approach? If yes, do you have access to and familiar with a multi-meter and even perhaps a soldering iron?
Great on the DIY Dave!
Possible suspects after a review of the Service Manual are:
Foremost check (even if just to eliminate as suspects) would be to test for the presence and consistency of the DC voltages to the CD recorder deck particularly the +5V.
Might an electronic copy of the repair/Service Manual be of interest? ...per site policies, there would be a token fee as it would be an additional service.
As a tech; repairs would be foremost however, as a user it would be to your advantage to evaluate other options considering cost of repair, down time, cost of shipping, age, parts availability and comparable prices of newer/better models. It would appear that both decks are exhibiting major faults.
On the other hand, a burner + laptop with appropriate app/utility software would serve the purpose (nicely).
Hi again Dave,
Please post back how you would want to approach this and/or should additional information be needed.