Repair of an HP82004A Power Reserve Pack

[albertofenini]

Thanks Tony

we'll try to rebuild it from scratch and will see what's wrong,
however, giving that it's capable of 50mA like the other one can we assume it is charging a battery ?

Take care

(04-06-2020 11:41 PM)teenix Wrote:  Hi all,

I hope everyone is well and keeping busy if in lockdown.

If the circuit described in the link above is accurate then there must be a short somewhere in the electronics or plug, otherwise it would be impossible for the LED to light.

Disconnect the end of the 100 ohm resistor to the plug. If the LED is still on, the LED anode might be shorted to the + battery wire.

The circuit is simple, keep disconnecting/reconnecting bits of it to determine where the fault is.

As the electronics is assembled as a rats nest, it would be easy for something to short.

cheers

Tony