AUDIO TELEX TX8000 User manual

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www.audiotelex.com
ITX8000
Channel Mixer 3
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Audio Telex Communications Pty Ltd
ACN 001345482 lncorporated in NSW
NSW & ACT QLD & NT vtc
149 Beaconsfield Street
Private Bag 149
Silverwater NSW 2128
Australia
Ph 02 9il71411
FaxO29648 3698
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Fax [phone]
221277 Middleborough Road
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WA SA TAS
299 Fitzgerald Street
West Perth WA 6005
PO Box 404
North Perth WA 6906
Ph 08 92284222
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Electronic Concepts Pty Ltd
76 George Street
Thebarton SA 5031
PO Box 7034 Hutt Street
Adelaide SA 5000
Ph 08 82U9444
Fax [phone]|
K W McOulloch Pty Ltd
54a Albert Road
MoonahTAS 7009
Ph 03 62286373
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New Zealand
Unit B, 11 Piermark Drive
PO Box 512
Albany NZ 1331
Ph 09 4159426
Fax [phone]

TX8000 Mixer
Product Description
The TX8000 is a single rack height, 8 channel monaural mixer suitable for desk or 19" rack mounting. Inputs 1-6 are dual
balanced microphone/auxiliary inputs while inputs 7-8 are balanced microphone inputs only. Each input channel has individual gain,
trim, bass & treble controls. The TX8000 has a separate master output level control. The TX8000 will operate from 240 VAC 50Hz or
110 VAC 60 Hz or 24VDC. Factory preset is 240 VAC.
Front Panel Controls
1. MiCrophone/AuXiliary Gain : The 8 input channels are labeled Chl .. Ch8 and should be adjusted to provide the required
mix level for each individual channel. Start with the controls set to Level 0 and tum the controls clockwise until the desired mix
level for each channel is reached. Each of the inputs is also equipped with an input sensitivity control which is located on the input
PCB of the TX8000. Please refer to the 'Other Intemal Adjusfrnents' section of this manual for full details of this feature.
BaSS TOnal COntfOl: Each input channel has a recessed (screwdriver adjustable) bass tonal adjustment contol labeled
"Bass". Setting this control in the centre position will give a flat bass response. Adjusting the bass control in a clockwise direction
will provide up to 12 dB of bass boost @ 100 Hz. Adjusting the bass control in a counter-clockwise direction will provide up to 12
dB of bass cut @ l00Hz.
Tfeble Tonal Control: Each input channel has a recessed (screwdriver adjustable) treble tonal adjustnent contol labeled
"Treble". Setting this control in the centre position will give a flat treble response. Adjusting the treble control in a clockwise
direction will provide up to 10 dB of treble boost @ lOK Hz. Adjusting the heble control in a counter-clockwise direction will
provide up to 10 dB of treble cut @ 10K Hz.
MaStef OUtpUt LeVel: The master output level control should be adjusted to set the overall mixer output level based on the
individual input channel levels already set via the individual microphone/auxiliary gain controls. Start with the output contols set
at approximately the Level 5 position and adjust clockwise for more output level or counter-clockwise for less output level.
VU Mgtgf: A 7 segment LED VU meter is provided for each output channel to give an indication of the signal level for each
ou@ut channel from -21 to +3 dB. For normal operation the LED's should oscillate in and out of the red zone. If the LED's in the
red zone are lit continually, then the output level controls (or the input gain contols) should be tumed courter-clockwise to reduce
the output level. Too much output level can cause signal distortion and a mismatch with the device that the mixer is driving.
Headphone OUtpUt SOCket A ll4' RTS stereo socket is provided for the connection of monitor headphones. The
output level to the headphones is a nominal 3.5 volts @ 600 ohms and is connected before the master output level controls so
adjusting the output level controls will not effect the headphone ou@ut level.
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7. PoWer Switch: The switch marked "Power" turns AC mains power'On' and 'Ofl to the TX8000. When the switch is in the
"On" position, a red neon will glow in the body of the switch. If the TX8000 is connected lo a24 volt DC supply, this switch will
not effect the operation of the TX8000 from the DC supply. If both AC and DC are connected, then the TX8000 will continue tc
operate normally when this switch is tumed 'OfP. The DC supply needs to be disconnected from the rear panel to completely 'turn
off the TX8000.
Rear Panel
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Features ofthe rear panel are as follows:
3 Pin IEC AC MainS POwer lnlet The operating voltage is 240 VAC @ 50 Hz or 110 VAC @ 60 Hz. The AC power
voltage level is not externally user adjustable but is factory pre-set. The inlet is equipped with an inbuilt AC fuse holder fitted with a
I Amp fuse plus a spare. Power consumption is 5 VA. I Please ensure that the mains power cord is disconnected beforr
attempting to check or replace this fuse.
ACC9SS POft This port is to allow for external cable egress for accessories such as the ATC5488 tone generator.
24 Volt DC Power Supply Connection: DC connection is via this 2.1mm socket with + (hich) on the centre pin and -
(low) on the outer pin. When DC is connected to these terminals the TX8000 will continue to operate regardless of the position o1
the AC power switch on the front panel. To turn offDC power to the TX8000, remove the connecting cables from these two posts.
The maximum DC current drain is 350 mA
+. MaSter Output Gonnectiofl] This is an active balanced XLR connection with a nominal level of 1.5 volts @ 600 ohms.
The pin connections are; pin #l-earth; pin #2-active (high, +); pin #3-active (low, ).
s. Dual RCA Sockets For Output To A Tape Recorderl Nominal 700mV @ tOK ohms. The rape output is
summed to mono and is connected before the master output level control so the tape output level is not affected by adjustments tc
the master output level control.
0. Active Balanced, XLR Sockets For The Microphone lnputs: with an input sensitivity of 0.6mv @200
ohms (see the 'Other lnternal Adjustments' section on the last page of this manual for details about the trim level control available
for each channel). Pin connections are: pin #l-earth; pin #2-active (high, +); pin #3-active (low, -). Phantom power of +18 volts is
available on all microphone inputs. An intemal on-offlink will switch the phantom power'on' or'ofl; the default setting is'on'.
See the 'Other Internal Adjustrnents' section of this manual for more details. Reading from left to right across the rear panel, the
connection are for microphone inputs 8, 7,6,5,4,3,2, & I respectively.
z. Dual RCA Sockets ForThe Auxiliary lnputsl Summedtoamonobusswithaninputsensitivityof 50mv-500mv
@ 47K ohms for input channels 1-6 only (see the 'Other lnternal Adjustments' section on the last page of this manual for details
about the trim level control available for each channel). Reading from left to right across the rear panel, the connection are for
auxiliary inputs 6, 5,4,3,2, & I respectively.
More information over the page 3
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Optional Accessories
g The installation of the following optional accessories involves access to the inside of the TX8000. Installation should
only be attempted by a qualified technician. Always turn off the AC power and remove the AC power cord before attempting
to access the inside of the TX8000.
TX3010 Vox Muting (Precedence) Module: The TX30l0 is a Vox operated muting module and when installed, input
channel #l will mute all other channels. Please refer to the comprehensive installation instructions packaged with the TX30l0
TX3014 Vox Muting (Precedence) Module: The TX30l4 is a dual priority, vox operated muting module and when
installed, input channel #l will mute all other channels while input channel #2 will mute channels 3-8. Please refer to the
comprehensive installation instructions packaged with the TX3014
ATC5488 4 Tone Generator Module: The ATC5488 provides bell, pre-announce, alert and evacuation tones. The alert
and evacuate tones are to Australian Standard A52220.1. Tone selection and activation cables may be routed via the access port in the
rear panel of the TX8000. The ATC5488 is connected as per the comprehensive instructions supplied with the ATC5488.
Please contact your supplier for pricing and delivery information for all ofthe optional accessories described above.
Other lnternal Adjustments
g The following adjustments involve access to the inside of the TX8000. Installation should only be attempted by a
qualified technician. Always turn offthe AC power and remove the AC power cord before attenpting to access the inside of the
TX8000.
Phantom Power Defea[ This 3 pin link is located on the output board directly behind the Mic #8 XLR socket on the rear
panel. The default setting is with the link in the 'on' position, shorting the centre pin and the pin closest to the rear of the TX8000. To
turn phantom power off, move the link to short the centre pin and the pin closest to the front of the TX8000.
lnput Sensitivity Adjustment These trim pots are located inside the TX8000 on the input circuit board at the rear of the
mixer and are labeled R*l-R*8 to indicate channels l-8 respectively. These pots should be adjusted to the desired trim level.
Looking for something worthy to connect to the inputs and outputs of your new TX8000? Well,
please call your nearest Audio Telex Communications office for referral to your closest
authorised Dealer or for more information on the full selection of our compatible sound
system products.