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Repairing The Lynx
The Lynx needs to have a cart inserted for it to power up.
It also needs power. Either batteries (6 AA cells) or a PSU providing between 6V..9V of DC current up to 1A. It should boot with about 0.6A. Plus on the tip, minus on the barrel.
Stuck batteries problem
Old Lynx I units may have old batteries stuck in the battery compartment. Usually the last two batteries are stuck and the user believes that the unit is broken because he tries to replace the 4 batteries that come out, but the 2 remaining batteries are completely dead and prevent the unit from operating.