Posts: 875
Threads: 37
Joined: Jul 2005
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Again:
will a common 5V regulator from the shop do the job? The original one seems to block charge.
A 5 Volt regulator does not seem to be applicable. The 67 charger supplies two separate outputs: one a regulated 4.2 Volt source that powers the calculator, and the other a 55 mA constant current/variable voltage source that charges the battery pack.
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Do you suggest that the plug that goes in the calculator may be broken inside (not visible, so)?
It is a very common problem for the wires to break inside the insulation at or near the junction with the plug.
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The cord itself seems to be OK from end to end.
In what way does it “seem” to be OK? Verify continuity from the contacts in the plug to the places where the wires are soldered inside the charger housing, to insure that the above problem has not occurred.