Trends Combo 12 Desktop Hi-Fi System User Guide
Section 6. Connection and Operation / Section 7. Technical Notes
11
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WARNING!
Before plugging the unit to the AC outlet, please check that your local
supply voltage is
110V AC
or
220V AC
(
specific model should be selected, not
compatible
)
·
Turn off the I/O switch of Trends PW-10 PSU, unplug it from the AC outlet.
·
Ensure that the connections are secure and tight.
·
Plug the Trends PW-10 PSU into the AC outlet, and press the I/O switch of the
Trends PW-10 PSU to “I”, then “Blue” indicator in the switch illuminates.
·
If the indicator fails to light, recheck the connection and AC outlet.
·
Turn on DA/UD and observe that the “Green” indicator, and then switch on
Trends UD-10.1 Lite USB Audio Converter.
·
Turn on TA and observe that the “Green” indicator, and then switch on Trends
TA-10.2 SE Class-T Stereo Audio Amplifier.
OPERATE IN A WELL VENTILATED OPEN AND COOL AREA. DO
NOT BLOCK THE OPENINGS AT THE FAN DISCHARGE ON THE
BOTTOM AND THE SUCTION OPENINGS ON THE SIDES.
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7.1 Configure as power amplifier (by-pass the volume control)
You can simply configure the amplifier as an integrated amp (with volume control
function) or as a pure power amp (no volume control function) by resetting the
jumpers in J2 as follows:
O O O O
O O O O
(integrated amp)
O O O O
O O O O
(power amp)
Trends Combo 12 Desktop Hi-Fi System User Guide
Section 7. Technical Notes
12
7.2 Offset the DC bias voltage of the speaker terminals
There are two blue adjustable potentiometers (Rt) inside Trends TA-10.2 SE for
offsetting the DC bias voltage between the positive (+ve) and negative (-ve)
terminals of each channel. Offset this DC bias voltage can enhance the purity of the
sound and minimize the “pop” sound when power on and off. The DC bias has been
pre-set in factory. But after run-in for a period, it would be slightly changed that the
fine-tuning is needed.
Before you tune these, you need a screwdriver (take off the case), a small
screwdriver (turn the screw of the potentiometer) and a (digital) multi-meter to
detect the DC bias voltage.
1.
Use screwdriver to take out the two top level screws in the front panel &
another two screws in the back panel. Then, open the upper case.
2.
Power ON the amplifier.
3.
Use the multi-meter to detect the DC voltage (200mV) between +ve & -ve
terminals of the RIGHT channel.
4.
Turn the screw on the top of the LEFT (near the front panel) potentiometer by a
small screwdriver clockwise or anticlockwise until the voltage as close as to
±0mV.
5.
Then, repeat step 3 and 4 for the LEFT channel by turning the screw on the top
of the RIGHT (near the back panel) potentiometer.
6.
Power OFF the amplifier
7.
Cover back the upper case and tighten the screws.
