Very good reproduction (copy) of original manual. Didn't have a parts list, but schematic was completely labeled with parts. Complete instructions on how to adjust mechanical functions of the 8-track deck. Well worth having and at a very reasonable cost.
Text excerpt from page 26 (click to view)
AVICAVIC F500BT PND Maintenance
3.1.1 3 1 P Power & N No Di Display l
When the power button is pressed, nothing happens.
Power & No Display
Charging the battery by a known good AC adapter
Yes The power is OK? Charging the battery No No Check the battery cable
Connect it connects OK?
Yes Yes Try another known good battery b is i OK? No Replace the main board