This is exactly the service manual I needed.
Complete with all schematics, partslists, PCB layouts and alignment instructions.
This manual covers both the T-4970 en T-488F Onkyo tuner.
Wanting to repair a neighbours tape recorder I needed the necessary information, it makes it easier. Although the service manual is described as "Language : English" To my dismay I found that it is entirely written in German, a language I do not understand. At least I now have the schematics which will help of sorts. I may not use this service again due to the laguage difficulty after all when it states English you do not expect it to be entirely in another language.
GOOD SERVICE MANUAL.I ALWAYS BUY THERE IF I FIND WHAT I AM LOKING
Text excerpt from page 28 (click to view)
HELP
Sheet attachment positions and procedures of processing the flexible boards/harnesses are shown.
THE METHOD OF ATTACHMENT OF FP-537 FLEXIBLE BOARD
1 Fold dotted line parts of the FP-537 flexible board as shown in figure. Fold Fold 4 Roll the the FP-537 flexible board 1.5 times, in the direction of arrow A.
Adhesive tape Adhesive tape A
Adhesive tape
Fold 5 Put the adhesive sheet and FP-537 flexible board on the hinge assy according to the position of the boss.
2 Pass the FP-537 flexible board through the flexible clamp. Flexible clamp