The service manual is a good quality scan of the Panasonic NV-850, which is electrically identical to the Philips VR 6920, but mecanically just nearly.
The service manual is a good quality scan of the Blaupunkt RTV-404, which is electrically and mecanically identical to the Panasonic NV-830.
Text excerpt from page 1 (click to view)
SERVICE MANUAL
CD CHANGER SYSTEM
6 2003 49859
CH-PKM60
ATT SOUND
U R SOURCE F D
VOL
VOL
KS-LH60R CD changer control receiver
Area Suffix E ------ Continental Europe
CH-X1500 CD changer
This model is combination of the CH-X1500,CD Changer and the KS-LH60R. CD changer control receiver in one packing. Please refer to the service manual of CH-X1500_E(No.49776)and KS-LH60R_E(No.49855) for items other than this packing.