Fast Download,all pages present,an excellent copy.THis enabled to find the origional part numbers and chase them up. The cartridge is proving difficult to find but at least I know the origional part number.Thanks to all.
Text excerpt from page 20 (click to view)
TROUBLESHOOTING GUIDES
D.
No sound in the linear playback mode
Is the output at pin 56 , 58 of IC251?
NO
Is 9V supplied pin of IC251? YES
60
NO
Check Power circuit
Is 5V supplied to pin 14 , 20, 30, 36 of IC251 and pin 75 of IC301? YES Is there Audio signal pin 1 0 0 of IC301? YES