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PB410/420 Miscellaneous Upgrades

Warning Only authorized service personnel should upgrade the system. Anyone who wants to upgrade the system herself/himself should know about the dangers of ESD (Electro-Static Discharge) and the necessary precautions. Unknowingly zapping the components of the computer will void the warranty.

Speaker Specifications

Use a standard 8 ohm, 1/2 watt computer speaker.
Move the cap on jumper J39 to pins 2 and 3, and attach the speaker to connector J38, pins 1 and 4.

Battery Specifications

Use a 3.6 Volt lithium battery.
Remove the shorting cap on jumper J24.
Then attach the battery to connector J28, positive to pin 1, negative to pin 4. Component Locations