Sony PHA-3 Help Manual page 55

When the battery cannot be charged
Check that the headphone amplifier and your computer are firmly connected via the micro-USB cable (supplied).
Use only the supplied micro-USB cable. Do not charge the battery using any other USB cable.
Check that the computer is turned on and not in standby, sleep or hibernation mode.
If the computer enters standby, sleep, or hibernation mode while the headphone amplifier is connected to the
computer, the POWER/CHG indicator turns off and the battery charge will not be completed properly. In this case,
change the computer settings and then charge the battery again.
Check that the headphone amplifier is directly connected to a computer using the micro-USB cable (supplied).
Charging may not be completed properly by an indirect connection, such as via a USB hub.
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Battery life
Analog connection: Approx. 28 hours
Digital (balanced) connection: Approx. 5 hours
when using the headphone amplifier at 1 mW + 1 mW output (24 Ω). Time may vary, depending on the immediate
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environment or conditions of use.
Hint
The battery can be charged via an AC outlet by using the recommended USB AC adaptor (AC-UD20) (sold
separately). Charging is completed in about 6 hours.
Note
The charge will continue for about 10 hours, then the timer function of the charge protection circuit will stop the
charging. If you want to continue charging, disconnect and reconnect the micro-USB cable.
When the headphone amplifier had not been used for a long time, it may take a while for the POWER/CHG indicator
to light up in red. In this case, do not disconnect the micro-USB cable from the headphone amplifier. Wait until the
POWER/CHG indicator lights up in red.
Charge the battery in an ambient temperature between 5 °C to 35 °C. If you try to charge the battery outside this
range, the POWER/CHG indicator may flash in red, but the battery may not be charged.
When the battery is full, the POWER/CHG indicator may not light up in red.
When storing the headphone amplifier for a long time, avoid a place subject to high temperatures. When storing the
headphone amplifier for more than a year, charge the battery every six months to prevent over discharge.
Related Topic
Charging the battery via an AC outlet
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Copyright 2014 Sony Corporation
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