Intermec 074787-001 User Manual
Chapter 2 — Theory of Operation
PB42 Portable Receipt Printer Service Manual
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A switching regulator converts the input voltage to 9.0 VDC. If the input
voltage drops below (about) 9.5 V the converter is not able to maintain a
9.0 V output, and will turn off. When this happens, EXT_PWR (IRQ1)
will be pulled down. When external power is within its acceptable voltage
range, EXT_PWR will be high.
voltage drops below (about) 9.5 V the converter is not able to maintain a
9.0 V output, and will turn off. When this happens, EXT_PWR (IRQ1)
will be pulled down. When external power is within its acceptable voltage
range, EXT_PWR will be high.
Charging Circuits
The Battery Charging Circuits and Battery Connector Pinout
There are two charging integrated circuits (ICs), one for each battery. Each
IC monitors their respective battery temperature. Charging current is
limited to 0.8 A per battery when powered from the DC jack. When the
contact (hinge) charger is used, charging current is limited to 0.4 A per
battery. This doubles the charging time. The signal CONT_CHG is high
when the contact charger is energized.
IC monitors their respective battery temperature. Charging current is
limited to 0.8 A per battery when powered from the DC jack. When the
contact (hinge) charger is used, charging current is limited to 0.4 A per
battery. This doubles the charging time. The signal CONT_CHG is high
when the contact charger is energized.