It has all the information you will need to fix it. The main circuit diagram is only A4 but being a PDF, you can print it to any size - I did it on two sheets of A3 and it didnt lose any detail - just made it readable when pinned up above the bench. I've found the fault, just need to buy some obscure bits to get it going again!
I cant fault the process, I paid for the manual in the morning and it was ready to download by lunch time.
I am very grateful for this manual. Without it could not repair my receiver.
Text excerpt from page 1 (click to view)
CD CHANGER SYSTEM
6 2003 49849
KS-FX842R CD changer control receiver
Area Suffix E ------ Continental Europe
CH-X550 CD changer
This model is combination of the CH-X550,CD Changer and the KS-FX842R. CD changer control receiver in one packing. Please refer to the service manual of CH-X550_E(No.49787)and KS-FX842R_E.EX(No.49854) for items other than this packing.