MTK952 User Manual
MTK952 User Manual
Dual Transmitter
Mono - Stereo - Intercom
Modulation
SN: ________________
rev.01 (rif. FW 1.2)
Author: Support
Date: 02 April 2013
MTK952 User Manual
rev.01
BRIEF DESCRIPTION
MTK952 is a versatile dual transmitter capable of working in a huge UHF bandwidth and of
generating any kind of narrow-band modulations, with very high quality and low spurious
emissions.
Main features:

330 MHz Bandwidth (470 MHz – 800 MHz)

2400 user-defined frequencies (40 group by 60 freq.)

Stereo, mono, intercom audio modulation

Output power up to 2 Watt (/W option)

Analogue & digital input (AES3)

Redundant power supply 230/110 Vac & 12 VDC

DSP audio processing (40bit floating point / 2Gflops) with multi-companding

Direct Digital Synthesis (DDS) of signal for the highest flexibility and quality (> 70 dB
stereo separation)s SWR (Stationary Wave Ratio) sensing on antenna outputs
Above a schematic with the functional diagram of one transmitter of MTK952.
MTK952 use extreme technologies like:

Direct Digital Synthesizer (DDS)
DDS is a type of frequency synthesizer used for creating arbitrary waveforms from a single,
fixed-frequency reference clock. A DDS has many advantages over its analog counterpart, the
phase-locked loop (PLL), including much better frequency agility, improved phase noise, and
precise control of the output phase across frequency switching transitions.
The Direct Digital Synthesis (DDS) technology can generate virtually any kind of modulation
while keeping an absolute phase accuracy.

Double conversion stage
Using a double conversion and saw filter at IFs (intermediate frequencies) we can achieve a
very low spurious emission and a great bandwidth agility (330 MHz).

Intermodulation cancelling power amplifiers
PA module (power amplifiers) is designed with an exclusive circuitry that reduce the
intermodulation generated by external carriers using a wideband phase cancelling design.
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MTK952 User Manual
Digital audio with Shark™ DSP 40bit floating point & 2 Gflops power from Analog Device
A very powerful Analog Design Shark DSP processor manages the audio with very low delay (<
1 ms) and emulates by software all companding and pre-emphasis effects.
SAFETY INSTRUCTION
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Read this safety instruction and the manual first
Follow all instructions and information.
Do not lose this manual.
Do not use this apparatus under the rain or near the water.
Do not install the apparatus near heaters or in hot environments, do not use outside the
operating temperature range.
Mount the apparatus as indicated in the instruction, do not block side grids for air ventilation
ATTENTION: supply the apparatus with a correct mains voltage and with the ground
connection. Check the power cord integrity.
The power cord must be protected from damage
Do not install the apparatus near heaters or in hot environments, do not use outside the
operating temperature range.
Do not open the apparatus, only qualified service technician are enabled to operate on it. The
apparatus needs servicing when it is not properly working or is damaged by liquids, moisture
or other objects are fallen in the apparatus.
Use only accessories or replacement parts authorized or specified by the manufacturer.
Clean the apparatus only with dry cloths, do not use liquids.
The ON/OFF is a double pole circuit breaker, but to ensure the complete disconnection of the
apparatus, disconnect the power cord.
Report the serial number and the purchasing date in front of the manual. It is needed to have
proper replacement parts or accessories from the manufacturer.
When replacement parts are needed, use only replacement parts authorized from the
manufacturer. Substitution with not authorized parts could result in electric shock, hazards or
fire.
Keep attention on all the labels with warnings or hazards on the apparatus.
The apparatus is intended for professional use; anyway the manufacturer alerts the
user that the headphone output power of the apparatus could exceed the level of 85 dB(A) of
sound pressure level and this could be dangerous for the hearings. Do not use the headphone with
high power level or for long time. Reduce the power or suspend the hearing in case of any kind of
hearing problem.
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MTK952 User Manual
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QUICK START INSTRUCTION
1.
2.
3.
4.
5.
6.
7.
Connect to the power outlet using the supplied power cable (see rear panel: connector 1)
Attach the antennas to the antenna out BNC connections (see rear panel: connectors 8 and 13)
Connect the audio sources to the relative audio input connectors (see rear rear panel: connectors 7
for digital audio sources, connectors 9÷12 for analog audio sources)
NOTE: the cascade configuration allows to use the same analog audio input for more transmitter
Power on the MTK952
Switch off the RF output:
a.
While the MTK952 is powering on and the progress bar appears, push the 3rd button at
the bottom (see indication “OFF” on the display)
b. At the end of MTK952 power on, push the lower button on the right of the displays
Push the rotatory knob and check the more appropriate mode in MODE (according to the
type/configuration of the receiver synchronized with the transmitter).
Enter in the MAIN>Audio source menu and
a.
configure the input parameter between digital and analog (according to the audio
source connected at point 3)
b. configure the AF level meter parameter as input
c.
if digital audio source:
 leave audio gain left and right parameters to 0dB and adjust the audio level
with the mixer
 if need change the audio gain left and right parameters
d.
if analog audio source:
 leave audio gain left and right parameters to 0dB and adjust Max audio level
parameter. NOTE: this parameters is unique for both the channels (right and
left)
 if need change the audio gain left and right parameters
NOTE: adjust the audio level (thru the mixer and/or Max audio level and/or the audio gain left and
right parameters) so that, for the maximum input signal level,
the AF level bars show the MAXIMUM
NUMBERS OF GREEN LED INDICATORS AND NO
YELLOW/RED CLIP LED INDICATORS
NO
8.
9.
10.
11.
YES
the MOD. (modulation) bar shows the
MAXIMUM NUMBERS OF GREEN LED
INDICATORS AND NO YELLOW/RED PEAK
LED INDICATOR
NO
YES
Enter in the MAIN>Gh-Gr menu and set the group/channel/ frequency
Enter in the MAIN>Mode menu and set the Mode from the list modes
Enter in the MAIN>TX Power menu and set the TX power (10÷200mW)
Exit from the menu and switch on the RF power output pushing the lower button on the right of the
display
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MTK952 User Manual
FRONT PANEL CONTROL AND FUNCTIONS
MTK952 allows an easy and quick configuration using buttons, push knobs and displays.
A
B
C
D
E
The front panel is functionally divided in the following section:
A – SCAN, SQUELCH and INFRARED
automatic scan /squelch settings and remote controlling and “MPR30-IEM” setup through infrared
interface
B and C - TRANSMITTER1 and TRANSMITTER2
Transmitter 1 and 2 configuration and monitor
of radio/audio levels.
❶ Audio and Modulation indicators

two LED bars for the AF levels (L=left & R=right levels): they can show AF input levels or
modulation levels (after the pre-emphasys and compander phases, before the
modulation phase) according to the AF level meter parameter on Audio source menu
FM modulation of the transmitter channel (modulation in dB referred to the nominal
deviation)

❷ LCD display.(64 x 254 yellow-lighted display)
❸ 3 push buttons (membrane). The function of each button (upper, middle and lower) will be
readable from the context menu on the display.
❹ Push rotary knob. Rotate and push to select.
❺ Warning (YELLOW) and Alarm (RED) light indicator
D - MONITOR
Monitor 1 and 2: it actives monitor audio on headphone jack output (6.3mm - ¼”) for transmitter 1
and 2, respectively (a green LED is lighted when audio is enable). Audio level can be adjusted with
the rotary knob. The red led (CLIP) indicates a clipping in the audio monitor output.
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E - POWER & LOCK
LOCK: it locks the editing of both the displays.
POWER: ON/OFF square powering button turns on/off the transmitter. When in OFF position both
phases are disconnected from power.
REAR PANEL
❶ ❷❸ ❹
❺❻
❼
❽ ❾
❿
⓫
⓬ ⓭
7
4
❶ AC Power Plug AC mains power input, IEC Connector 90-264 Vac
❷ Product label with Serial Number, Options and Bandwidth
❸ Ground point To connect the rack to ground
❹ DC Power Plug (optional) DC power input, 10-16Vdc, Max 6A
❺ label with IP address of ethernet interface configured on the MTK952 (it can be modified using
the Manager application)
❻ Ethernet socket (RJ45) for connection to a network or computer
❼ AES/EBU (XLR 3 pin connector) for digital audio input TX1 and TX2
❽ Antenna output TX1 (RF output) BNC socket
❾ Audio input left TX1 (balanced AF input) ¼” (6,3mm) jack/XLR-3 combo socket and ¼” jack
❿ Audio input right TX1 (balanced AF input) ¼” (6,3mm) jack/XLR-3 combo socket and ¼” jack
⓫ Audio input left TX2 (balanced AF input) ¼” (6,3mm) jack/XLR-3 combo socket and ¼” jack
⓬ Audio input right TX2 (balanced AF input) ¼” (6,3mm) jack/XLR-3 combo socket and ¼” jack
⓭ Antenna output TX2 (RF output) BNC socket
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MTK952 User Manual
LCD DISPLAY: TRANSMITTER MENU
MTK952 info screen
Switch on the MTK952 and by pushing one of rotatory knobs (at the right of the display) all the
basic information are displayed:
Display of TRANSMITTER 1
❶ product and bandwidth
❷ serial number
❸ class and hardware version
❹ Firmware version: it includes application
firmware version and DSP firmware version
Display of TRANSMITTER 2
OPTIONS:
DC: DC power input, 10-16Vdc, Max 6A
2W: 2Watt MAX power TX
Status screen
After switch on, the transmitters display the Status screen
The main view has the following info:
❶ transmitter name
❷ current channel number and current tuning frequency
❸ current group number and group name
❹ current mode
❺ TV channel used for the current frequency
❻ current TX power setting
❼ current SWR (Stationary Wave Ratio)
❽ power supply type (
for AC power
for DC power)
❾ menu
Thru the main menu on the LCD display and the LED bars for the AF level and modulation the user
has the complete monitoring in real time of the wireless channel in use.
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MTK952 User Manual
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MENU TREE
To access the configuration menu of the transmitter is necessary to press the rotary knob (at the
right of the display).
To activate one of the items in the menu, press the corresponding button to the right of the
display (see picture hereafter).
MAIN
MAIN:
Ch-Gr
Group name
Mode
TX on air at startup
TX Power
Audio source…
Options…
Audio source:
Input
Max audio level
Audio gain left
Audio gain right
AF level meter
Mono config
Options…
Name
DISPLAY brightness
DISPLAY timeout
Info…
MODE
Info:
Serial
Range
Temp. RF ampl.
Temp. RF gen.
Temp. micro
Temp. pwr supply
FW ver.
Boot ver.
App FW ver.
DSP FW ver.
Alarms
MODE:
Name
Mono/stereo
Compander
HP filter
LP filter
Pre-emphasis
FM peak deviation
TSQ frequency
TSQ deviation
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MTK952 User Manual
Main menu
The first item on the menu tree is “MAIN”.
Ch-Gr
The CHANNEL-GROUP item enables the user to edit channel, channel group and frequency of the
selected item. Change, rotating the knob, the channel or the group of channels and confirm or exit
with the buttons. To edit the frequency of selected channel, press the middle button and change it
with the knob. Press the knob to move between MHz and KHz. Confirm or exit with the buttons.
As shown in the above picture, the display area has 3 rows with:
1)
2)
3)
Channel number (0 to 60) and Channel frequency (in 25kHz step)
Number (1 to 40) and Group name (8 char.)
Group description (30 char.)
The MTK952 has 40 groups of 60 channels each. Normally this is too much for wireless
microphones applications.
Connecting with computer with WISYCOM Rack MANAGER software, it is possible to hide single
channels or even complete groups of channels: once hidden those items are not shown anymore
on the channels or groups selection. To show channels or groups hidden use again the WISYCOM
Rack MANAGER software.
Using this software it is also possible to lock channels or groups. When a channel is locked, it is not
possible to change the frequency from the front panel of the transmitter. Locking a group means
that all channels are locked. When a channel or a group are locked, at the left of the group name in
the Chan-Group menu will appear a lock icon as shown in the picture below. When the lock
picture is shown, the central button is not displayed, thus changing frequency is not possible.
Group name
The second item on the Main menu is GROUP NAME; with this function is possible to assign or
change a name to a group of channel. This short name (8 character) is displayed at the right of the
group number in the main display view. First chose the group and then press the knob. You will be
able to edit any character of the group name rotating the knob. Push the knob to edit the next
character. Confirm or exit with the buttons.
Mode
The MODE menu allows to assign a Mode setting at the transmitter. Rotating the knob it is possible
to change current mode among the modes available (for more detail see MODE menu).
TX on air at startup
This menu allows to decide if turn ON or turn OFF the RF power of the transmitter while the
MTK952 is powering on.
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MTK952 User Manual
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If set to NO: while the MTK952 is powering on, the RF output remains mute. The Status Screen on
the display shows “TX OFF “ and the set Group, Channel and frequency.
NOTE: When the RF power of the transmitter is OFF, all the led and the bars remain turned off.
Pushing the rotatory knob (at the right of the display) it is possible to activate the led and bars
(keeping the RF power OFF) and enter on the menu.
rd
In order to activate the RF output press the 3 button
at the bottom (see indication “ON” on the display).
If set to YES: during the MTK952 power on, the progress bar appears for 10 seconds. During this
interval (10 sec.) it is possible to switch off the RF
output. If no button is pushed, at the end of the timer
the RF output is enabled automatically.
TX power
This menu allows to set the power of the transmitter. Rotating the knob it is possible to change
current TX power setting among 10/20/50/100/200 mW (2W only for MTK952 with 2W option).
Push the SAVE button to confirm. In the same screen is showed the reflected power and the SWR
(Stationary Wave Ratio) sensing on antenna outputs.
The set TX power and the measured SWR are always
showed at the bottom of the display.
Audio source
This menu allows to set several parameters of audio input
Parameters
Range setting
Function
Input
Max audio level
(only for analog input)
Audio gain left
digital/analog
-6/0/66/12/18 dBu
Audio gain right
-20÷24dB
AF level meter
input/modulation
Mono config
(only for mono Mode)
Mono/monoR/mono-L
To set the audio input
To change (increase or decrease) the analogue audio
input for both R(right) and L(left) channels input
To change (increase or decrease) the input level of the
left channel on DSP
To change (increase or decrease) the input level of the
right channel on DSP
To set which AF level is shown in the two LED bars for the
AF levels (L=left & R=right levels): they can show AF input
levels or modulation levels (after the pre-emphasys and
compander phases)
To set the type of mono input
-20÷24dB
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MTK952 User Manual
Options:
This menu allows to change some parameters of the transmitter or display some information
Parameters
Name
Range setting
Function
ex. TRANSMITTER1
DISPLAY brightness
DISPLAY timeout
0÷15 step 1
5÷60 step 5sec.
60÷120 step 10 sec.
To change the name of the transmitter shown in the Status screen.
12 alphanumeric characters (A-Za-z0-9, case-sensitive)
To set the brightness of the display
To set the display timeout for:

decrease the brightness of the display and

return to Status screen
to show the serial number of the product
(the same indicated in the product label)
to show the frequency range (MHz)
to show the temperature took near the RF amplifier (°C)
to show the temperature took near the RF generator (°C)
to show the temperature took near the RF microprocessor (°C)
to show the temperature took near the power supply (°C)
to show the firmware version
to show the bootloader version
to show the application firmware version
to show the DSP firmware version
To show the number “n” of active alarms:

n=0  0 active alarms

n>0  n active alarms
Serial
ex. R1825694
Range
Temp. RF ampl.
Temp. RF gen.
Temp. micro
Temp. pwr supply
FW ver.
Boot ver.
App FW ver.
DSP FW ver.
Alarms
ex. 470-800
ex. 30°C
ex. 31°C
ex. 33°C
ex. 31°C
ex. 1.1
ex. 0.2.d
ex. 0.36.d
ex. 0.61.d
ex. 0
Info
When “n”>0, it is possible to enter in the alarm submenu which
allows to show the alarms list: a brief description and an alarm
code for each alarm.
For the complete list of alarms, see Alarm List section
Note: the complete software and hardware status is displayed on the MTK952 info screen
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MTK952 User Manual
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MODE menu
The second item on the menu tree is “MODE”. It allows to manage several modes.
Each mode is a setup saved in an external memory that allows to customized the transmission
changing some parameters of the DSP. There are 2 types of modes:


PRESET mode: it allows to change only some parameters (the other are fixed)
USER mode: it allows to change all the parameters. Currently 8 USER modes are available
.
The menu Select to edit allows to select the MODE to edit. Push the knob to select the mode and
push the button LOAD to load the previously saved parameters. It is possible to change the
parameter value only where the EDIT indication appears.
During this phases, the name of the MODE to edit appears on the left top of the display. If the
MODE to edit is the current mode load on the DSP (on
the Main>Mode menu) the “dsp” abbreviation
indication is shown.
Shown below the parameters list:
Parameter
Range setting
Name
Mono/stereo
mono/stereo
Compander
Description
Changeable
PRESET
MODE
USER
MODE
name of mode
no
yes
type of transmission
no
yes
compander type
no
yes
HP filter
Flat/20/40/60/80/
120/170/250/300
Hz
High Pass filter
yes
yes
LP filter
3/4/12/15/20 Kz
Low Pass filter
yes
yes
Pre-emphasis
Bypass/10-750 µs
Pre-emphasis
FM peak
deviation
2÷100 KHz
Max peak deviation
TSQ frequency
30÷260Hz
28÷34KHz
TSQ deviation
OFF/100Hz÷5kHz
(audio+tone squelch)
and
Frequency of Tone Squelch signal
Deviation of Tone Squelch signal
yes
yes
related
to the
mode
yes
yes
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MTK952 User Manual
Alarm List
When an alarm occurs, the MTK952 can do one or more of the following acts:
A. show a message on the display
C.
B. turn on the yellow or red alarm
led
insert the alarm on the alarm list in the MAIN>Options>Info>Alarms menu
The alarm can be related to a specific transmitter (TX1 or TX2) or general.
Shown below the complete alarms list:
Alarms
Code
Type
Message on display (A)
Led
(B)
Alarm list (C)
TX Power Mismatch
-
TX
yellow
no
TX Power reduced
0x05
TX
yellow
Tx power
reduced
Timeout 5 sec on PLL
Errore bus I2C
0x84
TX
general
red
red
Timeout 5 sec on PLL
OL969
High internal
temperature
0x84
general
Rf PLL lock lost
Error on I2C
bus
OL PLL lock lost
0x04
general
Fan #1 doesn't work
0x02
general
Fan #2 doesn't work
0x03
general
Recovered
configuration and
calibration data from
copy1 on the
memory
Recovered
configuration and
calibration data from
copy2 on the
memory
Load default
configuration and
calibration data
0x80
general
ATTENTION: antenna mismatch!
High SWR on Tx out
ATTENTION: antenna mismatch!
High SWR on Tx out. Rf pwr
reduced
ATTENTION: RF PLL lock lost
EEPROM access error
(only on TX1)
ATTENTION: OL PLL lock lost
(only on TX1)
ATTENTION: internal temperature
high
(only on TX1)
ATTENTION: fan #1 does't work
properly
(only on TX1)
ATTENTION: fan #2 does't work
properly
(only on TX1)
no
0x81
general
0x8D
general
12
red
yellow
High internal
temperature
yellow
Fan #1 doesn't
work
yellow
Fan #2 doesn't
work
no
Mem. copy1
recovered
no
no
Mem. copy2
recovered
no
no
Mem. init.
Service req.
MTK952 User Manual
rev.01
Troubleshooting
Alarms
TX Power Mismatch
Alarm description
The SWR on Tx out is too high
reduced TX Power
The SWR on Tx out is too high,
the RF power is reduced
Timeout 5 sec on PLL
bus I2C Error
Timeout 5 sec on PLL
OL 969
High internal
temperature
Error during frequency tuning
Error on I2C bus
Error during frequency tuning
Fan #1 doesn't work
The fan on the left (#1) doesn’t
turn
The fan on the right (#2) doesn’t
turn
During the MTK952 initialization
phase, the CRC-16 check of data
(copy1) detects error.
Fan #2 doesn't work
Recovered
configuration and
calibration data from
copy1 on the memory
Recovered
configuration and
calibration data from
copy2 on the memory
Load default
configuration and
calibration data
One of the 4 temperature
sensors measures a temperature
> 60°C
Throubleshooting
- check if the antenna is correctly connected
- check if the antenna cable is correctly
connected
- check if the antenna frequency is according
to the one set on the transmitter
- check if the antenna is correctly connected
- check if the antenna cable is correctly
connected
- check if the antenna frequency is according
to the one set on the transmitter
- send to repair at Wisycom Repair Centre
- send to repair at Wisycom Repair Centre
- send to repair at Wisycom Repair Centre
- check if the two fans work properly (check
alarms code 0x02 or 0x03 on the alarm list)
- switch off the MTK952 for cooling and check
the location temperature
- clean the ventilation grids
- switch off and switch on the MTK952
- switch off and switch on the MTK952
- none (the MTK952 automatically replaces
the corrupt copy1 with copy2)
During the MTK952 initialization
phase, the CRC-16 check of data
(copy2) detects error.
- none (the MTK952 automatically replaces
the corrupt copy2 with copy1)
During the MTK952 initialization
phase, the CRC-16 check of data
(copy1 and copy2) detects error.
- check in the MAIN>Options>info menu the
Serial take on the ‘UNCAL’ vale. In this case
send the MTK952 to the Wisycom Repair
Centre for recalibration.
If a problem occurs that is not listed in the above table or if the problem cannot solved with the
proposed troubleshooting, please contact support service at [email protected] or
[email protected]
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MTK952 User Manual
RACK TX MANAGER MTK952
How to install Rack Tx Manager MTK952
Run the executable file (i.e. Rack Tx Manager (MTK952) SERVICE vx.x.x.x Setup.msi) and follow the
installation instructions.
How to update Rack Tx Manager MTK952
Uninstall the Rack Tx Manager MTK952 program active in your computer and afterwards install the
newest version of Rack Tx Manager MTK952.
How to connect MTK952 to Rack Tx Manager MTK952
1. Connect to the PC to the MTK952using the supplied Ethernet cable
2. Run Rack Tx Manager MTK952
3. Power on the
transmitter
4. Push Disconnected
button. On the Device
connection windows
select Ethernet port and
fill in the MTK952 IP
address. Remember that
the label on the rear
panel shows the IP
address configured in
the factory. Then click
OK.
5.
14
If the connection is
ended well, the
Connected icon is
showed on the top of
the panel and
“Connected on
Ethernet” is displayed
on the information
panel
MTK952 User Manual
rev.01
How to load/save channels memory
Select Channel memory panel
Write:
Push the button Write from WDF file… and select the wdf file to load a wdf file on the MTK952.
Read and save:
Push the button Read and save to WDF file… , insert the .wdf file name and the path where to
save the wdf file.
During the process of writing/reading & saving, a green bar below the panel shows the progress of
the process and on the information panel it is possible to verify what the application is doing.
To Modify the wdf file, it is possible to use the spreadsheet FREQUENCY 2010 v15 beta.xls presents
at the following link:
- open the file and enable changes and macro
- load the wdf file clicking on READ WDF button
- execute the desiderate changes
- save the wdf file clicking on SAVE WDF button
The WDF thus modified can be used to write on the MTK952’s channels memory.
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MTK952 User Manual
ITALY ONLY
Obblighi di informazione agli utilizzatori
Modello di informazioni agli utenti dei prodotti di tipo “professionale”
INFORMAZIONE AGLI UTENTI
ai sensi dell’art. 13 del Decreto Legislativo 25 luglio 2005, n. 151 “Attuazione delle Direttive 2002/95/CE,
2002/96/CE e 2003/108/CE, relative alla riduzione dell’uso di sostanze pericolose nelle apparecchiature
elettriche ed elettroniche, nonché allo smaltimento dei rifiuti”
Il simbolo del cassonetto barrato riportato sull’apparecchiatura o sulla sua
confezione indica che il prodotto alla fine della propria vita utile deve
essere raccolto separatamente dagli altri rifiuti.
La raccolta differenziata della presente apparecchiatura giunta a fine vita e’
organizzata e gestita dal produttore. L’utente che vorrà disfarsi della
presente apparecchiatura dovrà quindi contattare il produttore e seguire il
sistema che questo ha adottato per consentire la raccolta separata
dell’apparecchiatura giunta a fine vita.
L’adeguata raccolta differenziata per l’avvio successivo dell’apparecchiatura
dismessa al riciclaggio, al trattamento e allo smaltimento ambientalmente compatibile contribuisce ad evitare
possibili effetti negativi sull’ambiente e sulla salute e favorisce il reimpiego e/o riciclo dei materiali di cui è
composta l’apparecchiatura.
Lo smaltimento abusivo del prodotto da parte del detentore comporta l’applicazione delle sanzioni amministrative previste dalla normativa vigente.
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•
WISYCOM srl • Via Spin 156 • I-36060 Romano d’Ezzelino • Italy
Tel. +39 -0424 -382605 • Fax +39 - 0424 – 382733 • www.wisycom.com • e-mail: [email protected]
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