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 8 (click to view)
XM-PX55BU/MX-PX55SL XM-PX55RD
Removing the feed motor (See Fig.12)
1. Peel off the part h of the flexible wire on the underside of the feed motor. 2. Unsolder the solder joint i connecting the flexible wire to the feed motor. 3. Peel off the part j of the flexible wire. 4. Remove the two screws J attaching the feed motor on the upper side of the chassis assembly. ATTENTION: When reassembling, reattach the flexible wire with an adhesive tape and solder the appropriate part.
Chassis
Feed motor
j
J
i
h
Fig.12
Removing the switchi board assembly (See Fig.12)
1. Remove the switchi board assembly attached to the side of the chassis assembly with the double-sided tape. 2. When reassembling, reattach the switchi board assembly with an adhesive tape as before.