Probably it never existed a 1081 official service manual from Commodore, it's look more like a NAPCEC service manual & diagrams compilation of the 1084 series and his variants, like the nap6523, 8cm505, 1084S, 1084P and obviously the 1081. It's more complete than other scans and the quality of the scans also are far superior. It has two circuit diagrams variants of the 1081, mono and stereo versions. It doesn't include a diagram for the Philips CM8500 or CM8501, they look like the 1081 but they are slightly different.
Text excerpt from page 6 (click to view)
KRC-788
ADJUSTMENT
No ITEM
INPUT SETTINGS
OUTPUT SETTINGS
TUNER (RECEIVER) SETTINGS
ALIGNMENT POINTS
ALIGN FOR
FIG.
CASSETTE DECK SECTION [1] AZIMUTH
TCC-153 10kHz
Connect a AC voltmeter to SP OUT Connect a AC voltmeter to CN200
Head Azimuth TAPE PLAY Screw VR200A (L) VR200B (R)
Adjust the azimuth for each Lch/Rch or FWD/RVS becomes maximum 300mV (a)
[2]
PLAY BACK LEVEL
TCC-130
TAPE PLAY
F/E CASSETTE MECHANISM VR200B VR200A Rch Lch R G L AC voltmeter (a) 300mV
CN200
ATTENTION OF ASSEMBLY
Assembly of FPC(Flexible PC board) onto Roller ass'y Turn Roller ass'y by 4 times. Hook the end of Roller ass'y to the tongue. Insert the FPC into the slit of Roller ass'y then release the end of Roller ass'y and the tongue.
