Qls QA-350 User Manual

QA-350 WAV high fidelity music player user manual
Welcome to use QA-350 WAV high fidelity music player,Please spend several
minutes to read this user manual before preparing using it.
QA350 is a WAV high fidelity music player designed and made by QLS Electronics. SD
card is applied as storage medium while lossless WAV format as the sound source. The
player integrates DAC and headphone Amplifier circuit with the built-in high-capacity
rechargeable lithium polymer battery. It is convenient to carry with and play music.
Meanwhile, the player is designed have RCA coaxial output and optical output to
facilitate the QA350 to be a pure digital sound source. QA350 is also have analog signal
output which can be directly connected to amplifier or preamp etc.
Caution of using lithium polymer battery:
1. non-equilibrium charger is prohibited which may cause lithium batteries damage,
smoking, heated or burned!
2. over discharge, over charge or reverse charge will immediately lead to lithium
damage! The over charged state when the batteries are left aside for long time will
be presented by its self-discharge characteristics. In order to prevent over-discharge,
the battery shall be charged periodically, at least one time in a month, or else lithium
batteries may be damaged because of over-discharge.
3. batteries or the player shall be put in the clean, dry, and ventilated places with the
relative humidity less than 75%. Storage should avoid the short circuit; do not place
the battery near a heat source or prolonged exposure to sunlight. Temperature rise
will shorten battery life.
4. in order to avoid over-discharged damage to the battery, please ensure that the
power switch is at OFF when the player is not used. (Even if the battery is used to
the automatic shutdown, the power switch should certainly be pulled to the OFF
position).
5. for the safety of user and the property, when charging the batteries, please ensure
that someone is at the site. Do not charge when no one is at home or sleeping at
night.
6. Prevent falls, shocks, and bending batteries against fires.
7. in any case, the battery shell cannot be dismantled, or else the inner short circuit can
be caused, leading to bump and fire.
8. it is prohibited that the direct connection of short-circuit of the battery positive and
negative poles. It may result in serious damage to the battery, or even fire.
9. strictly prohibited to throw battery in fire or liquids to avoid danger.
10. strictly prohibited to charger in the car.
11. in order to avoid adverse consequences caused by the battery abnormal use, please
do not put lithium batteries or the player to places within reach of children.
Main Features of QA350 Player:
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High accuracy crystal clock 2ppm TCXO crystal to ensure the best sound quality.
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Support 16ohm-300ohm headphones.
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Optical and Coaxial digital output, and LINE OUT output, Headphone Amp output.
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Support two control methods: buttons and remote. buttons can be locked.
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Support two power supply methods: the battery and external DC power supply.
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0802LCD synchronous display. Backlight controllable.
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Support firmware upgrade.
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Each module independent LDO offer power supply. The player works more stable
with less power noise.
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Real-time monitoring of battery voltage. When the battery voltage is low, output is
automatically shut down.
Sound Source File:
Files are put in order by the number/ alphabet ascending order. Files in the root directory
come in front of all the files in all folders. folder are put in order by the number/ alphabet
ascending order too, which include:
1) All the files in the root directory come before the first folder.
2) Folders are put in the same order.
3) files in each folder is put in the same order.
SD card format:
FAT32 format less than (equal to) 16G, SD/SDHC
Power:
1, an external 9V - 12V linear power supply is applied. Polarity requirements are:
positive is inside and the negative is outside.
2, 7.4 V built-in lithium battery
When an external power supply and the lithium battery are applied at the same time, the
power supply of higher voltage is automatically selected; when charging the battery, an
external power supply can be applied.
When using battery power, it is recommended that you turn off the LCD backlight
to save battery power.
Battery protection:
In the work process, the real-time monitoring will be applied to the battery voltage.
1, when the battery voltage is below the protection threshold value, the host will
automatically turn the power off; if now the external power is applied, first the power is
turned off before turn up the player again.
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