Vintage Yamaha PSS-120 keyboard w/box & manual (Made in Japan)

Description

Vintage Yamaha PSS-120 keyboard in very good condition. Keyboard appears unused and is in nearly perfect physical condition. Item has been tested and is working, but there is one significant issue I found. All keys work when pressed individually; however, when multiple keys are pressed at once, some don't function. I do think this is a polyphonic keyboard, so this shouldn't be happening. It is possible that there are some dirty contacts in the key bed. All other sounds and keyboard functions are working properly. Power indicator illuminates. Built-in speaker works correctly. Unit operates on four 'C' batteries. AC adaptor was sold separately and not included with this keyboard.
Cosmetically, instrument is in excellent condition and shows virtually no wear. Battery compartment is clean and door is present. Original manual is intact but shows wear. There are some stains & small holes in cover. Manual has creases and small tears. There is also some additional paperwork included (warranty info, etc.). Original box is in very good condition and is fully intact. Original foam end caps & foam bag are included and in VG shape.
Keyboard is guaranteed to arrive in described condition, but is sold As/Is-No Returns.