HP106 Service Manual
Page 8 of 12
The battery voltage status is monitored by the microprocessor IQ9 Pin 61 which senses the battery voltage
through the BATT+SW line by means of IR51/IR49. When the battery voltage is approximately 5.8V, the
microprocessor considers the battery discharged and switches off the circuits of the radio.
When the Radio is on a channel with no tone programmed, the BATTERY SAVER Mode is enabled when
programmed.
In the BATTERY SAVER mode, the microprocessor IQ9 generates a square wave signal at Pin 48 which is
applied to the inverter IQ10:6. The signal’s duty cycle varies according to what the POWER SAVE TIMER is set.
When the microprocessor IQ9 Pin 48 goes high (approx. 5 V) Q226 (receiver module) is biased off, Q225 is
biased on, Q224A is cut off, and Q223A is cut off, thus turning the supply off to IC6.
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