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HP 82143A Internal view

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This printer can be opened by loosen 5 screws. One screw is clearly visible on the back, the other four screws are hidden behind the rubber feet.

HP82143A

The picture above shows an opened printer, seen from the back side.

 

HP82143A

All electronics are build on one PCB. The discoloration on the left top is caused by heat.
At this spot the power resistor is located that controls the charging current for the battery pack.

 

HP82143A

A nice detail is the reflective wheel to synchronize the printer speed with the electronics.

On the PCB the next integrated circuits were found.

HP part number Description Equivalent datasheet
1810-0037 Resistor array 8 x 1K    
1820-1016 Dual driver SN75453BP download
1820-1641 Hex buffer SN74LS365AN download
1820-2280 Processor MK3870 download
1826-0287 Quad comparator LM2901 download
1858-0056 Quad transistor array NTE2322 download

 

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HP 82143A internal related links:

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