This manual is accurate and of high quality. It is only volume 2 of the service manual. This is schematic, parts lists, and exploded mechanical drawings. The theory of operation and the diss-assembly instructions are in volume 1. The unit can be tricky to dis-assemble portions of so the volume 1 manual can be important. The product description of the manual is accurate but it does not say anything about volume 1 and the image of the front page does clearly say Volume 2.
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.
Text excerpt from page 1 (click to view)
CH-PK921R
SERVICE MANUAL
CD CHANGER SYSTEM
CH-PK921R
KD-SX921R
DAB
EQ
TP PTY
KD-SX921R CD changer control receiver
Area Suffix
E --------- Continental Europe
CH-X 50 0
CO MPA CT
DISC
CH AN GER
12� DIS C
CH-X500 CD changer
This model is combination of the CH-X500, CD Changer and the KD-SX921R, CD changer control receiver in one packing. Please refer to the service manual of CH-X500(No.49698) and KD-SX921R(No.49719) for items other than this packing .