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HP 11C: Difference between revisions
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== Common issues and repair == | == Common issues and repair == | ||
== Hardware revisions == | |||
The earliest 11C revisions used two separate PCBs, one with the logic and display, and a second with the keypad. Later revisions consolidated everything down to one board further reducing cost. | |||
Electrostatic discharge (ESD) protection was a major consideration in the design of early voyager models, as time went on the methods of ESD protection on the 11C changed. Early models had minimal protection, one spring to connect the front and back metal plates, and conductive textured rubber feet connected to the rear metal plate with a copper tab. Later models switched to two springs and omitted the copper tab and conductive feet, while adding additional plastic sheets on the rear of the button PCB. | |||
{| class="wikitable" | |||
|+ | |||
!Date code | |||
!Battery contact type | |||
!Processor | |||
!PCBs | |||
!ESD shielding | |||
!Springs | |||
!Grounded feet | |||
|- | |||
|2127 | |||
|Metal tab | |||
|1LE3 | |||
|2 | |||
|Minimal | |||
|1 | |||
|Yes | |||
|- | |||
|2137 | |||
|Metal tab | |||
|1LE3 | |||
|2 | |||
|Large plastic flaps | |||
|1 | |||
|No | |||
|- | |||
| | |||
| | |||
| | |||
| | |||
| | |||
| | |||
| | |||
|} | |||
== See also == | == See also == | ||
== References == | == References == | ||