This is the 2nd time I download manuals from this website and I can say it's what I was expecting. It contains schematic, layout (decent quality), short description, parts and dissasembly instructions. I recomend it for anyone who wants to repair/modify this device.
Very useful Service Manual! With it I was able to identify the damaged pots in my old amplifier, purchase the adequate replacements and make myself the repair.
I have again my old amplifier, still a very good one that I will keep for as many years as I can!
Thanks to Owner Manuals!
Text excerpt from page 5 (click to view)
TROUBLESHOOTING
No power Power indicator does not light up.
Connect an AC adapter into the power jack.
Does the keyboard work? No
Yes
Check contact at battery springs. Measure voltage at pin 16 of IC AN8053N. Replace D101. Is the voltage +6.8 V? No Check contact of power switch. Check contact of the power jack. Clean the switch contacts. No Is it OK? Yes Yes