OmniSistem UA880 User Manual

RR

User Manual

ED-B3-MA-070410-002

Beta three

PROFESSIONAL POWER AMPLIFIER

UA2000/UA2002/UA1330/UA1332

UA660/UA662/UA330/UA332/UA880

DEAR CUSTOMERS:

series

Please carefully read and strictly follow the user's m anual w hen y ou u se U A

professional .

CATALOGUE

1

2

3

4

5

6

7

amplifier. If you have any question, please contact the local dealer

Attentions

Functions&features

Parameters

Installation

Front panel

Rear panel

Power supply

P1

P1

P2

P10

P10

P12

P12

8

9

10

11

12

13

Input/Output connectors

Function setup and cable connection

Operations

Indicators on front panel

Protection functions

Troubles and troubleshootings

P13

P13

P14

P16

P16

P17

1 NOTES

High voltage inside the equipment. Do not open the cover. Ask for the help from the
professionals when need servicing.
Please do not expose the equipment in the rain or moisture.
Keep adequate ventilation, do not block the port.
Be sure the voltage of this equipment complies with the local industrial voltage.
Please put off the power plug if unused for a long time.
Please connect rated load. Never working under the overload for a long time.

Symbols:

The equilateral triangle with lightning bolt warns the user of dangerous voltage levels
localized within the cabinet.
The equilateral triangle with exclamatory mark means the important operation on the
user's manual.

2 FEATURES

UA series is the amplifier with big power and excellent performance. It can meet

different audio avenues.

1> Big power,dynamic energy;
2> Innovative heat sink structure and high quality heat sink fan assure reliable working for
a long time;
3> "loading impedance temperature-power-running voltage" can be controlled alternately,
Speed of Fan is automatic adjusted by temperature. When load is too low or temperature
is too high, the equipment can adjust the power supply and lower impedance of power,
which improves sound quality and protect the equipment better. The reliability will be
improved remarkably;
4> Low distortion;
5> High slew speed, outstanding sound quality and high transparent;
6> Low noise:S/N>108dB(A Weight);
7> 20Hz~20KHz <+0/-0.25 dB;wide frequency band;
8> Small dimension, 2U rack mounting.

9> UA2002,UA1332,UA662,UA332 are specially designed for low loading imedance,and
can work for a long time under 2 .

1

3

PARAMETERS-UA2000

Rated Power

THD

Intermodulation
distortion

Frequency response

Phase difference
Damping factors

Segregation

S/N

Total gain

Difference of
Channel gain

Input sensitivity

Slew speed

Input impedance

Stereo mode

Parallel mono mode

Bridged mono mode

<0.05%(10%Rated power

<0.1%(60Hz/7kHz,10%Rated power

20Hz~20kHz(+0/-0.25dB)

<15
>800(8 /100Hz)

>75dB

>108dB(A-Weight)

39 0.5dB

<0.25dB

1V

>100V/ s
Unbalanced input 10k ,Balanced input 20k

8

4

8

4

16

8

1000W

1600W

1000W

1600W

2000W

3200W

Input connectors

Output connectors

Cooling

Controls on front panel

Controls on rear panel

Indicator on front panel

Amplifier protection

Dimensions
Net weight

Power supply

Environment
Temperature

Environment humidity

Three pin XLR/6.35mm

Speakon binding post,NL4 speakon

Four fans stepless shifting,
Cooling airflow from front to back

Switch of AC,Gain controlling knob for channel A and B

Parallel/Stereo/Bridge, LF cutting,Grounding,Limit

Yellow-Bridge,Red-Overload,Green-Signal

Short Circuit, Maladjustment of DC, Overload, Overheat ,Etc

483 452 88mm
30kg

AC 220-230V,50Hz/60Hz,1500VA

Working temperature: -10 ~40
Storing temperature: -25 ~80

90%

2

3

PARAMETERS-UA2002

Rated Power

THD

Intermodulation
distortion

Frequency response

Phase difference
Damping factors

Segregation

S/N

Total gain

Difference of
Channel gain

Input sensitivity

Slew speed

Input impedance

Stereo mode

Parallel mono mode

Bridged mono mode

<0.05%(10%Rated power

<0.1%(60Hz/7kHz,10%Rated power

20Hz~20kHz(+0/-0.25dB)

<15
>800(8 /100Hz)

>75dB

>108dB(A-Weight)

35.7 0.5dB

<0.25dB

1V

>70V/ s
Unbalanced input 10k ,Balanced input 20k

4

2

4

2

8

4

950W

1500W

950W

1500W

1900W

3000W

Input connectors

Output connectors

Cooling

Controls on front panel

Controls on rear panel

Indicator on front panel

Amplifier protection

Dimensions
Net weight

Power supply

Environment
Temperature

Environment humidity

Three pin XLR/6.35mm

Speakon binding post,NL4 speakon

Four fans stepless shifting,
Cooling airflow from front to back

Switch of AC,Gain controlling knob for channel A and B

Parallel/Stereo/Bridge, LF cutting,Grounding,Limit

Yellow-Bridge,Red-Overload,Green-Signal

Short Circuit, Maladjustment of DC, Overload, Overheat ,Etc

483 452 88mm
30kg

AC 220-230V,50Hz/60Hz,1500VA

Working temperature: -10 ~40
Storing temperature: -25 ~80

90%

3

3

PARAMETERS-UA1330

Rated Power

THD

Intermodulation
distortion

Frequency response

Phase difference
Damping factors

Segregation

S/N

Total gain

Difference of
Channel gain

Input sensitivity

Slew speed

Input impedance

Stereo mode

Parallel mono mode

Bridged mono mode

<0.05%(10%Rated power

<0.1%(60Hz/7kHz,10%Rated power

20Hz~20kHz(+0/-0.25dB)

<15
>800(8 /100Hz)

>75dB

>108dB(A-Weight)

37.3 0.5dB

<0.25dB

1V

>80V/ s
Unbalanced input 10k ,Balanced input 20k

8

4

8

4

16

8

660W

1000W

660W

1000W

1330W

2000W

Input connectors

Output connectors

Cooling

Controls on front panel

Controls on rear panel

Indicator on front panel

Amplifier protection

Dimensions
Net weight

Power supply

Environment
Temperature

Environment humidity

Three pin XLR/6.35mm

Speakon binding post,NL4 speakon

Four fans stepless shifting,
Cooling airflow from front to back

Switch of AC,Gain controlling knob for channel A and B

Parallel/Stereo/Bridge, LF cutting,Grounding,Limit

Yellow-Bridge,Red-Overload,Green-Signal

Short Circuit, Maladjustment of DC, Overload, Overheat ,Etc

483 375 88mm
18kg

AC 220-230V,50Hz/60Hz,1000VA

Working temperature: -10 ~40
Storing temperature: -25 ~80

90%

4

3

PARAMETERS-UA1332

Rated Power

THD

Intermodulation
distortion

Frequency response

Phase difference
Damping factors

Segregation

S/N

Total gain

Difference of
Channel gain

Input sensitivity

Slew speed

Input impedance

Stereo mode

Parallel mono mode

Bridged mono mode

<0.05%(10%Rated power

<0.1%(60Hz/7kHz,10%Rated power

20Hz~20kHz(+0/-0.25dB)

<15
>800(8 /100Hz)

>75dB

>108dB(A-Weight)

34.2 0.5dB

<0.25dB

1V

>70V/ s
Unbalanced input 10k ,Balanced input 20k

4

2

4

2

8

4

660W

1000W

660W

1000W

1300W

2000W

Input connectors

Output connectors

Cooling

Controls on front panel

Controls on rear panel

Indicator on front panel

Amplifier protection

Dimensions
Net weight

Power supply

Environment
Temperature

Environment humidity

Three pin XLR/6.35mm

Speakon binding post,NL4 speakon

Four fans stepless shifting,
Cooling airflow from front to back

Switch of AC,Gain controlling knob for channel A and B

Parallel/Stereo/Bridge, LF cutting,Grounding,Limit

Yellow-Bridge,Red-Overload,Green-Signal

Short Circuit, Maladjustment of DC, Overload, Overheat ,Etc

483 375 88mm
15kg

AC 220-230V,50Hz/60Hz,1000VA

Working temperature: -10 ~40
Storing temperature: -25 ~80

90%

5

3

PARAMETERS-UA660

Rated Power

THD

Intermodulation
distortion

Frequency response

Phase difference
Damping factors

Segregation

S/N

Total gain

Difference of
Channel gain

Input sensitivity

Slew speed

Input impedance

Stereo mode

Parallel mono mode

Bridged mono mode

<0.05%(10%Rated power

<0.1%(60Hz/7kHz,10%Rated power

20Hz~20kHz(+0/-0.25dB)

<15
>800(8 /100Hz)

>75dB

>108dB(A-Weight)

34 0.5dB

<0.25dB

1V

>60V/ s
Unbalanced input 10k ,Balanced input 20k

8

4

8

4

16

8

330W

500W

330W

500W

660W

1000W

Input connectors

Output connectors

Cooling

Controls on front panel

Controls on rear panel

Indicator on front panel

Amplifier protection

Dimensions
Net weight

Power supply

Environment
Temperature

Environment humidity

Three pin XLR/6.35mm

Speakon binding post,NL4 speakon

Four fans stepless shifting,
Cooling airflow from front to back

Switch of AC,Gain controlling knob for channel A and B

Parallel/Stereo/Bridge, LF cutting,Grounding,Limit

Yellow-Bridge,Red-Overload,Green-Signal

Short Circuit, Maladjustment of DC, Overload, Overheat ,Etc

483 375 88mm
15kg

AC 220-230V,50Hz/60Hz,500VA

Working temperature: -10 ~40
Storing temperature: -25 ~80

90%

6

3

PARAMETERS-UA662

Rated Power

THD

Intermodulation
distortion

Frequency response

Phase difference
Damping factors

Segregation

S/N

Total gain

Difference of
Channel gain

Input sensitivity

Slew speed

Input impedance

Stereo mode

Parallel mono mode

Bridged mono mode

<0.05%(10%Rated power

<0.1%(60Hz/7KHz,10%Rated power

20Hz~20KHz(+0/-0.25dB)

<15
>800(8 /100Hz)

>75dB

>108dB(A-Weight)

31.2 0.5dB

<0.25dB

1V

>50V/ s
Unbalanced input 10k ,Balanced input 20k

4

2

4

2

8

4

330W

500W

330W

500W

660W

1000W

Input connectors

Output connectors

Cooling

Controls on front panel

Controls on rear panel

Indicator on front panel

Amplifier protection

Dimensions
Net weight

Power supply

Environment
Temperature

Environment humidity

Three pin XLR/6.35mm

Speakon binding post,NL4 speakon

Four fans stepless shifting,
Cooling airflow from front to back

Switch of AC,Gain controlling knob for channel A and B

Parallel/Stereo/Bridge, LF cutting,Grounding,Limit

Yellow-Bridge,Red-Overload,Green-Signal

Short Circuit, Maladjustment of DC, Overload, Overheat ,Etc

483 375 88mm

12.5kg

AC 220-230V,50Hz/60Hz,500VA

Working temperature: -10 ~40
Storing temperature: -25 ~80

90%

7

3

PARAMETERS-UA330

Rated Power

THD

Intermodulation
distortion

Frequency response

Phase difference
Damping factors

Segregation

S/N

Total gain

Difference of
Channel gain

Input sensitivity

Slew speed

Input impedance

Stereo mode

Parallel mono mode

Bridged mono mode

<0.05%(10%Rated power

<0.1%(60Hz/7kHz,10%Rated power

20Hz~20kHz(+0/-0.25dB)

<15
>800(8 /100Hz)

>75dB

>108dB(A-Weight)

32 0.5dB

<0.25dB

1V

>50V/ s
Unbalanced input 10k ,Balanced input 20k

8

4

8

4

16

8

200W

300W

200W

300W

400W

600W

Input connectors

Output connectors

Cooling

Controls on front panel

Controls on rear panel

Indicator on front panel

Amplifier protection

Dimensions
Net weight

Power supply

Environment
Temperature

Environment humidity

Three pin XLR/6.35mm

Speakon binding post,NL4 speakon

Four fans stepless shifting,
Cooling airflow from front to back

Switch of AC,Gain controlling knob for channel A and B

Parallel/Stereo/Bridge, LF cutting,Grounding,Limit

Yellow-Bridge,Red-Overload,Green-Signal

Short Circuit, Maladjustment of DC, Overload, Overheat ,Etc

483 310 88mm
11kg

AC 220-230V,50Hz/60Hz,300VA

Working temperature: -10 ~40
Storing temperature: -25 ~80

90%

8

3

PARAMETERS-UA332

Rated Power

THD

Intermodulation
distortion

Frequency response

Phase difference
Damping factors

Segregation

S/N

Total gain

Difference of
Channel gain

Input sensitivity

Slew speed

Input impedance

Stereo mode

Parallel mono mode

Bridged mono mode

<0.05%(10%Rated power

<0.1%(60Hz/7kHz,10%Rated power

20Hz~20kHz(+0/-0.25dB)

<15
>800(8 /100Hz)

>75dB

>108dB(A-Weight)

29 0.5dB

<0.25dB

1V

>50V/ s
Unbalanced input 10k ,Balanced input 20k

4

2

4

2

8

4

200W

300W

200W

300W

400W

600W

Input connectors

Output connectors

Cooling

Controls on front panel

Controls on rear panel

Indicator on front panel

Amplifier protection

Dimensions
Net weight

Power supply

Environment
Temperature

Environment humidity

Three pin XLR/6.35mm

Speakon binding post,NL4 speakon

Four fans stepless shifting,
Cooling airflow from front to back

Switch of AC,Gain controlling knob for channel A and B

Parallel/Stereo/Bridge, LF cutting,Grounding,Limit

Yellow-Bridge,Red-Overload,Green-Signal

Short Circuit, Maladjustment of DC, Overload, Overheat ,Etc

483 310 88mm
11kg

AC 220-230V,50Hz/60Hz,300VA

Working temperature: -10 ~40
Storing temperature: -25 ~80

90%

9

3

PARAMETERS-UA880

Rated Power

THD

Intermodulation
distortion

Frequency response

Phase difference
Damping factors

Segregation

S/N

Total gain

Difference of
Channel gain

Input sensitivity

Slew speed

Input impedance

Stereo mode

Parallel mono mode

Bridged mono mode

<0.05%(10%Rated power

<0.1%(60Hz/7kHz,10%Rated power

20Hz~20kHz(+0/-0.25dB)

<15
>800(8 /100Hz)

>75dB

>108dB(A-Weight)

38 0.5dB

<0.25dB

1V

>80V/ s
Unbalanced input 10k ,Balanced input 20k

8

4

8

4

16

8

800W

1260W

800W

1260W

1600W

2560W

Input connectors

Output connectors

Cooling

Controls on front panel

Controls on rear panel

Indicator on front panel

Amplifier protection

Dimensions
Net weight

Power supply

Environment
Temperature

Environment humidity

Three pin XLR/6.35mm

Speakon binding post,NL4 speakon

Four fans stepless shifting,
Cooling airflow from front to back

Switch of AC,Gain controlling knob for channel A and B

Parallel/Stereo/Bridge, LF cutting,Grounding,Limit

Yellow-Bridge,Red-Overload,Green-Signal

Short Circuit, Maladjustment of DC, Overload, Overheat ,Etc

483 452 88mm
25kg

AC 220-230V,50Hz/60Hz,1200VA

Working temperature: -10 ~40
Storing temperature: -25 ~80

90%

10

4

INSTALLATIONS

UA2000/UA2002/UA880:

Æø

Á÷

Á÷

·½ÏòÆø

·½Ïò

76.2mm

UA1330/UA660:

446mm

441mm

435.7mm

430.5mm

4

46mm

ÆøÁ÷·½ÏòÆøÁ÷·½Ïò

425

mm

433.0mm

.9mm

87

465.

air f

low

0m

m

482.

ÆøÁ÷·½ÏòÆø Á÷ ·½ Ïò

4mm

ÆøÁ÷·½ÏòÆøÁ÷·½Ïò

ÆøÁ÷·½

ÆøÁ÷·½

Ïò

Ïò

m

433.0m

376mm

371mm

365.7mm

360.5mm

35

376mm

5mm

46

5.0mm

Æø

Á÷

Á÷

·½ÏòÆø

·½ Ïò

76.2mm

m

87.9m

air flow

482.4mm

11

4

INSTALLATIONS

UA1332/UA662:

Æø

Á÷

Á÷

·½ÏòÆø

·½Ïò

76.2mm

UA332/UA330:

376mm

371mm

365.7mm
360mm

376m

ÆøÁ÷·½ÏòÆøÁ÷·½Ïò

3

55mm

m

87.

433.0mm

mm

9

465.

air f

0m

low

m

482.

ÆøÁ÷·½ÏòÆø Á÷ ·½ Ïò

4mm

·½ÏòÆø

·½Ïò

Á÷

Á÷

Æø

ÆøÁ÷·½ÏòÆøÁ÷·½Ïò

433

.0mm

310mm

302.5mm

298mm

292.5mm

2

8

9mm

3

1

0

mm

465.0mm

ÆøÁ÷

·½

·½

ÏòÆøÁ÷

Ïò

76.2mm

m

87.9m

482.

4mm

air flow

12

5 FRONT PANEL

4

5

3

1 2

1 air input port
2 signal indicator of channel A
3 overload indicator of channel A
4 bridge indicator of channel
5 overload indicator of channel B

6 REAR PANEL

RR

7

PRO DESIGN

UA SERIESUA SERIES

ON

POWER

-12-12

-10-10

-14-14

-16-16

-18-18

-20-20

-24-24

-8-8

-6-6

-4-4

-2-2

00

BETA THREE

8 9

-12-12

-10-10

-14-14

BRIDGE

PEAK

SIGNAL

-16-16

-18-18

-20-20

-24-24

-8-8

-6-6

-4-4

-2-2

00

CHBCHA

UA2000

6

6 signal indicator of channel B
7 power switch
8 gain adjustment pots of channel A
9 gain adjustment pots of channel B

1 2

CHA

BRIDGE IN

INPUT

SIGNAL GND

PIN1:

SIGNAL +

PIN2:

PIN3:

SIGNAL -

MODE

3

BRIDGE

PARALLEL

STEREO

LF FILTER

CHB

10

50HZ

25HZ

5HZ

CLIPLIMITER

OFF

ON

OUTPUT ASSIGNMENT:

CHA SIGNAL

CHA:

PIN 1+ :
PIN 1 - :

CHA GND

PIN 2+ :

CHB SIGNAL

PIN 2 - :

CHB GND

BRIDGE MONO OUTPUT:

PIN1+ : SIGNAL

CHA :

4

GROUND

11

OFF

ON

CHB:

PIN2+ :

PIN 1+ :
PIN 1 - :
PIN 2+ :
PIN 2 - :

CHB SIGNAL
CHB GND

GND

BRIDGE

8 9

1 signal input of channel A(XLR JACK)
2 signal input of channel A(1/4 mic jack)
3 switch of working modes
4 limiters
5 signal output of channel B(binding post)
6 signal output of channel A(binding post)
7 fuse

6

-

A

+

+

-

+

B

-

5

12

CHA OUTPUT

CHB OUTPUT

13

7

!

CAUTION

RISK OF ELECTRIC SHOCK

DO NOT OPEN

FUSE

Special design for big power£¡

POWER

CABLE

14

8 signal input of channel B(XLR plug)
9 signal input of channel B(1/4 mic jack)
10 filter switch
11 grounding switch
12 signal output of channel A(NL4 JACK)
13 signal output of channel B(NL4 JACK)
14 cable

13

7

POWER SUPPLY

Please assure the local voltage comply with the voltage indicated on rear panel before

connecting power supply ( );

Please assure the cable and jack of power supply not damaged before connecting power

supply; Put off the plug after power off;

8

INPUT/OUTPUT CONNECTORS

Input connectors

The XLR jack and 1/4 microphone jack in same channel are paralleled;

Input the signal from either connectors and output the signal for connecting next amplifier;

If the amplifiers connected are too many, the sound quality may be affected;

AC 220-230V,50Hz/60Hz

Please do not input the signal from two connectors in same channel at the same time.

Output connectors

The binding post and NL4 jack in same channel of UA series amplifier are paralleled;

Do not connect loads to the two connectors at the same time;

The red end of binding post is connected with anode of speaker, the black end connected

with cathode of speaker;

Only the load suited with the power and impedance of amplifier can be connected

with the output connectors of amplifier.

14

FUNCTION SETUP AND CABLE CONNECTING

9

1> :Limiter setup

As the below drawing, when switch is OFF, the limit is off,
the limit circuit is out of work, if input signal is too strong,
output can cause clip distortion and also raise overload on
loudspeaker

As the below drawing, when the switch is ON, the limit is
on, if the input signal is too strong, the limit circuit can
control the gain and reduce the distortion, also control the
average output power, but it does not affect peak power,
protect the loudspeaker and assure the dynamic of music.
Note: Please set to "ON" position when using.

2> LF cutting setup:

When LF cutting is at 50Hz,it equals discrete a 50Hz
high pass filter on input, the signal lower than 50Hz will
be accordingly attenuated, then can reduce the
noneffective swing and lower the distortion.
Like the right drawing:

+1

0dB

-1

-2

-3

-4

-5

-6

20 30 40 50

OFF

CLIP

LIMITER

ON

OFF

CLIP

LIMITER

ON

50HZ

25HZ

5HZ

LF FILTER

80

200 300 400

100

60

500

Hz

When LF cutting is at 25Hz, it equals discrete a 25Hz
high pass filter on input circuit, it just attenuate the signal
lower than 25Hz.
Like the right drawing:

+1

0dB

-1

-2

-3

-4

-5

-6

20 30 40 50

50HZ

25HZ

5HZ

LF FILTER

80

200 300 400

100

60

500

Hz

15

FUNCTION SETUP AND CABLE CONNECTING

When LF cutting is at 5Hz, the audio signal
can be amplified really.
Like the right drawing:

3> Mode option and signal cable connection,

Like the right drawing:

Connecting direction:

AStereo connecting mode:

Put the switch of mode at stereo,
like the right picture:

Under the stereo mode, the signal on channel A and
channel B is independent, the signal to channel A is
just for channel A, the signal to channel B is only for
Channel B. Like the right drawing:

LF FILTER

XLR unbalanced

XLR asymetrique
unsymetri is che XLR
XLR no balanceado

Ground

Balanced
Symetrique
Symmetrisch
Balanceado

50HZ

25HZ

5HZ

inverting input -

non-inverting input +

1

3

2

1 2

+1

0dB

-1

-2

-3

-4

-5

-6

20 30 40 50 60 80 100 200 300 400 500

TRS unbalanced

TRS asymetrique
TRS no balanceado
Unsymetriscbe jStereoklinke

3

Unbalanced

Asymetrique

Unsymmetrisch

No balanceado

MODE

Ground

non-inverting input +

BRIDGE

PARALLEL

STEREO

Hz

B Mono paralleled mode:

Put the switch of mode at PARALLEL, like the
below picture:
Under the mono parallel mode, the effect of input
signal from channel A and channel B is same. The
signal on input channel A can be provided to output A,
also to output B. The signal on input channel B not only
provide to output A, also to output B, But please not
input the signal from channel A and B at the same time.
Note: The mono parallel mode just means the
parallel of input signal. Never parallel the output
terminals, Like the drawing:right

C Bridged mode:

Put the switch of mode at BRIDGE, like the
right picture:
Under the bridged mono, signal just can be input from
channel A, no voice if input from channel B, the anode
of output A is the anode of bridged output, the anode
of output B is the cathode of bridged output.
like right drawing:

Under the bridge mode, The output voltage is so high enough to make a
electronic shock. Please power off the unit before operate it under bridge mode.
If need bridge operation under 4 please select UA2002

16

OPERATIONS

10

Please follow the steps during using the equipment

1> Start

a Setup thef unction a nd c onnection a ccording t o t he a bovef unctions etup a nd
connecting;
b Check if the output cable is short circuit and the load is too low;
c Check if the local voltage complies with the user's manual;
d Be sure the switch of power supply at "0" and the volume is the lowest;
e Connect the power supply, turn on the equipment of sound source, pre and effect
equipment and assure these equipments work in order;
f Turn on the switch of power supply(put it at"1"position);
g Adjust the knob of volume clockwise to right position.

2> Off

a Adjust the knob of volume unti-clockwise to the lowest;
b Turn off the switch of power supply on the front panel(put it at "0"position);
c Turn off the pre and effect equipments, sound source equipments;

INDICATORS ON FRONT PANEL

11

1>If signal indicator flashes, it means if there is signal output in two channels;
2>If peak indicator flashes, it means that the input voltage is too high. You should turn
down the volume;
3>If the peak indicator always lights,it means faults.The reason is like this: loading is too
low,short on loading,temperature is too high.You should check it after power off. Turn
on again if no abnormity;
4>If bridge indicator lights, it means the amplifier is under the bridged mode.

PROTECTION FUNCTION

12

Perfect protection function can prevent the damage for amplifier and speaker caused by
short circuit and output DC and overheat.

1>Short circuit protection: when the load at the output end is short circuit, the equipment
can cut off the signal and protect the equipment;
2>Output DC protection: when the equipment has faults and there is DC in output signal,
the equipment can cut off output automatically and avoid damage for speaker caused
by DC;
3>Overheat protection: If the temperature of heat sink is over the allowed temperature,
the sensor will cut off the output , avoid damage caused by high temperature and
protect the a mplifier.

17

TROUBLES AND TROUBLE SHOOTINGS

13

Trouble

No voice, Power indicator
lights off

No voice, Power indicator
Lights, Signal indicator
Light off

CLIP indicator last slighting
on, Voice is abnormal

SN

1

2

3

1

2

3

1

2

3

Troublele shootings

Check if the power plug and jack are connected well.

If the power jack corresponds
with .AC 220-230V,50Hz/60Hz

Check if the fuse on rear panel is broken.

Check if the music signal cable is connected well.

Check if the power of music source is turned on and
the volume is turned on.

If the volume pots is turned on.

If the music source output is too big.

If the CLIP LIMITER is at the "ON"position.

Check if there is any short circuit in output
connectons and if the load is correct. The restart.

The bass is not sufficient

No voice on one
channel under paralleled
mono mode

Output of bridge is too low

Burning the fuse when start

Others

1

1

1

2

1

1

If the LF FILTER on rear panel is at the LF 50Hz or at
LF 25Hz, setup the switch at appropriate place.

Check if the switch of MODE on rear panel is
at the PARALLEL,please put it at PARALLEL if it not
at the position.

Check the input signal can comply with voltage,
please enhance the input signal if not sufficient.

Check if input SIGNAL voltage is suited, please
enhance the input SIGNAL if not sufficient.

Check the local voltage is same as the voltage of the
equipment.

Check if the setup and connection are accordant with
the user manual.

18

19

20

RR

User M anual

PROFESSIONAL POWER AMPLIFIER

U A SERIES

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