VTL IT-85 User manual
VTL
IT-85 Integrated amplifier
Owner’s Manual
MAKING TUBES USER FRIENDLY
VTL IT-85 Integrated Amplifier
Information in this document is subject to change without notice. No part of this document may be
reproduced or transmitted in any form or by any means, electronic or mechanical, for any purpose, without the
express written permission of VTL.
Version History:
Version 3.2 April 23, 2008
Part Number: 0020-001
Copyright ©2008 by VTL Amplifiers Inc. All rights reserved.
4774 Murrieta Street, Suite 10
Chino, CA 91710, USA
Phone 909.627.5944 • Fax 909.627.6988
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Table of Contents
Chapter 1.................................................................................................................................. 1
Introduction............................................................................................................................ 1
Symbol Conventions used in this guide...............................................................................2
Electrical Safety Notice........................................................................................................2
Water and Moisture..............................................................................................................2
Location and Ventilation......................................................................................................3
Servicing..............................................................................................................................3
Operational Warnings..........................................................................................................3
Chapter 2.................................................................................................................................. 5
Getting Started ....................................................................................................................... 5
Unpacking the IT-85 from its box........................................................................................5
Check for tube placement.....................................................................................................6
IT-85 Front Panel.................................................................................................................7
The IT-85 Rear View...........................................................................................................8
Connecting the VTL IT-85 Integrated amplifier to your system .......................................10
Voltage Setting...................................................................................................................11
Power Source for the VTL IT-85 Integrated amplifier......................................................11
Fitting the Batteries to the Remote Control........................................................................11
Chapter 3................................................................................................................................ 13
Operating the VTL IT-85 Integrated Amplifier.................................................................... 13
Power on Stages.................................................................................................................13
Powering your system on...................................................................................................13
Ground Loop Hum.............................................................................................................15
The Remote Control Hand-held Unit.................................................................................15
Powering the system off.....................................................................................................16
Selecting Source Components............................................................................................17
Selecting Headphone out ...................................................................................................17
Connecting the IT-85 to a Home Theater System..............................................................18
Using the Tape out.............................................................................................................19
Connecting a second amplifier to your IT-85....................................................................19
chapter 4................................................................................................................................. 20
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Care and Maintenance of your VTL IT-85............................................................................20
Break in Period ..................................................................................................................20
Tube types..........................................................................................................................20
Tube Life............................................................................................................................20
Bias checking and Setting..................................................................................................21
Top view and Bias Measurement points and Tube complement of the IT-85 amplifier....24
Changing Tubes.................................................................................................................24
Changing the Main and B+ Fuses......................................................................................26
Cleaning.............................................................................................................................27
Troubleshooting.................................................................................................................27
chapter 5..................................................................................................................................30
Specifications........................................................................................................................30
Chapter 6.................................................................................................................................31
Warranty ...............................................................................................................................31
Appendix.................................................................................................................................33
Warranty Registration........................................................................................................33
Service Notes.....................................................................................................................33
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CHAPTER 1
Introduction
Congratulations on your purchase of the VTL pure tube IT-85 Integrated
amplifier.
his hand crafted equipment is designed to deliver superb performance for
your listening pleasure for many years to come. Please take a moment to read
through this owner’s manual, as it contains all of the installation procedures
needed to connect your new IT-85 to the rest of your audio system, as well as
the various functions the IT-85 can perform. Please take enough time to get familiar
with the features of this product. After you have finished reading this manual please
keep it in a safe place for future reference.
T
The VTL team is proud that you have selected the VTL IT-85 Integrated amplifier as
the newest member of your home audio system. The IT-85 is designed to give you the
convenience and flexibility to manage all of your audio sources, while at the same time
easily integrating into your existing home theater system.
The VTL IT-85 is a true integrated amplifier, insofar as it has both a full line level
preamplifier and a complete amplifier section in one compact package. We have
chosen this route over the "high gain amplifier with passive volume control" approach
for several reasons.
Integrated amplifiers (ie. amplifiers that are both preamplifier and power
amplifier) offer the user many benefits that separates cannot, primarily simplicity
and space efficiency, coupled with some cost savings that is realized from
eliminating a chassis, power supply, and a pair of interconnects to connect the two
chassis. Ease of installation is another primary benefit with integrated amplifiers.
Yet another benefit from integrating the line preamplifier and power amplifier into
one package is the elimination of the output buffer stage that is required on a
typical preamplifier. Even though the output stages used today are very
transparent sounding, absolute sonic purity dictates that any circuitry that is not
needed is better left out. The reason a buffer is needed on an output stage in a
preamplifier is to lower the output impedance to drive the next stage (usually a
power amplifier, with unknown input impedance) and/or the interconnecting
cable, with its capacitance.
When the power amplifier input impedance is known, (as it is in an integrated
amplifier), this impedance matching circuit can be left out entirely, which gives a
direct connection between these two necessary stages.
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A line stage with gain (and therefore dynamic headroom) always yields superior
sound in dynamic musical passages. This approach allows the use of a buffered
preamplifier out, for a subwoofer or for bi-amplifying. (Check the relevant section
in this owners manual for further details.)
Finally, the VTL IT-85 Integrated amplifier is designed primarily for the user
whose primary source is a line source. If phono is a primary source then a separate
phono stage will be required to step the cartridge voltage up to line level and to
handle the RIAA equalization needed to re-equalize the signal from the record.
Since this stage is usually a high gain stage and is therefore susceptible to noise, it
is sonically better to separate this stage from the power amplifier and its high
power fields anyway, so including this stage into an integrated amplifier would not
be of much benefit.
Symbol Conventions used in this guide
Certain symbols are used in this owner’s manual to draw your attention to important
points being discussed. For your own safety and that of your equipment you should
note and heed the warnings that follow these symbols.
The “Warning - Pay particular Attention” symbol used is
And the “Warning – Observe These Precautions for Your Safety” is
Electrical Safety Notice
Electrical voltage from power cables can be hazardous. We recommend that the power
cord used with this unit be connected to a properly grounded AC outlet. To prevent
electrical shock, do not remove the cover of the IT-85, especially while the unit is
powered on.
Water and Moisture
The IT-85 should be kept away from sources of water or moisture. If liquid enters the
unit it must be immediately returned to your dealer for servicing. In this case you
should under no circumstances try to power the unit on - there are hazardous voltages
present in this unit that can cause serious injury if they come in contact with you.
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Location and Ventilation
Install the IT-85 in a location that is stable and well ventilated. If the IT-85 is placed in
a built-in installation, ensure that there is adequate room for a supply of air to flow
through the ventilation openings. Allow at least 9 inches clearance on the top and
around the sides of the IT-85. Do not place the IT-85 next to heat sources such as
radiators, stoves or other appliances. Be sure the IT-85 is at least 10 inches away from
your turntable to prevent possible noise introduction into your system. Tiptoes or
other isolation accessories may prove useful in reducing mechanical vibrations. Do not
place the IT-85 on the floor where small children can tamper with the equipment. If it
is not possible to place the IT-85 out of the reach of small children it is recommended
that you remove power cables when the equipment is not in use.
Servicing
Do not attempt to service the IT-85 beyond the procedures described in this manual.
For all other service and questions, please contact your authorized VTL dealer or the
factory.
Operational Warnings
Do not touch the tubes after the IT-85 is turned on. Tubes can get very hot
while the IT-85 is operating. Turn off the IT-85 and allow the tubes to cool down
before attempting to work with the tubes.
Do not attempt to disassemble the IT-85 chassis or remove any covers from
the IT-85. Always consult with your VTL authorized dealer or the VTL factory
support department before attempting any service work on any VTL unit.
Always connect your loudspeaker to the amplifier before powering the IT-85 on.
Operating the IT-85 without a speaker load connected can damage the output
transformer, and will not be covered under the warranty. Also, ensure that no
speaker cables can become loose during use and that there are no intermittent
faults with the cables.
Tube amplifiers are heavy and awkward to lift, with the weight unevenly
distributed, and you should not attempt to move the unit without help. The IT-85
Integrated amplifier weighs approximately 55 lbs. (26.5 Kg).
Do not attempt to make or break any connections to the IT-85 while the unit is
powered on as this can damage the IT-85 and/or the rest of the system, and this
damage is not covered by warranty.
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If this unit has tetrode/triode switch, do not flip the triode tetrode
switches while the unit is powered on, as this can damage the switch
and is not covered under warranty.
Do not exceed fuse ratings or attempt to bypass any fuses, as
this can cause an extremely hazardous condition and will void
any warrantees. Use only the same type and rating of fuses as
specified in the owners’ manual and marked on the unit.
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CHAPTER 2
Getting Started
Unpacking the IT-85 from its box
The VTL IT-85 Integrated amplifier is shipped in a carton and wrapped in thick
plastic. The plastic is not strong enough to support the unit, and may tear if you try to
lift the unit out of the box with it. Also there are protruding switches which could
break if the unit is not properly handled, and in addition to the awkward, unbalanced
heavy load the unit has a cleaning polish on it which makes it slippery and hard to
grasp. We have found that the best way to remove the IT-85 from the box is as
follows:
1. With the box on a thick carpeted floor, fold back all the flaps of the top of
the carton, leaving all the packing foam in place. Roll the carton onto one
long side on top of the flap.
2. Roll the box once more onto the open top and, making sure that none of
the flaps is trapped under the carton, lift the carton off the unit.
3. Rotate the IT-85 onto one of the foam ends.
4. Lift the top foam away from the unit and carefully cut away the plastic
from around the IT-85.
5. Rotate the IT-85 onto the other end and lift off the other piece of foam
and the plastic.
6. Rotate the unit onto its bottom so that it lands on its four rubber feet.
7. When lifting the unit, be sure to only lift it from the bottom under the
transformers. Be careful not to break any switches. Be sure to only set the
IT-85 down on its bottom side on the four rubber feet on a stable surface.
Setting it on any other side may damage protruding components.
If the unit is too heavy or too awkward to lift then do not attempt to do this
by yourself, but rather find someone to help you. Save the carton and all
packaging for any future shipment of the IT-85.
After you open the carton you should find the following items inside:
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• The VTL IT-85 Integrated amplifier
• A power cord for the electrical system in your country.
• The remote control hand-held unit
• This User Manual, VTL Quality Assurance and test documents, VTL product
warranty registration card
Remove each item from its packaging material and check to make sure that no physical
damage has occurred during shipping of the unit. There should be no rattles inside
either of the IT-85 or remote control units. Look through the vent slots and check to
see that the tubes appear properly seated firmly in their sockets. Contact your VTL
dealer immediately if physical damage is detected.
Check for tube placement
Use the following procedures to check whether the tubes standing on the deck of your
IT-85 are placed firmly in their sockets, as the tubes can become dislodged and loosen
during shipping of the IT-85.
Visually inspect through the vent holes to ensure that all tubes are fully seated before
powering the unit on for the first time. If there are any tubes not fully seated then you
should refer to your VTL dealer, and take this procedure with the unit.
Notes for the servicing/installing technician:
1. Remove the protective wire cage on the top deck of the IT-85. The cage is
mounted with two screws on each side of the IT-85. Loosen the screws
and lift the wire cage slowly and carefully. Do not let the cage touch or hit
any of the tubes inside the IT-85. Keep the cage and the screws in a
separate place while you’re working on the IT-85.
2. Make sure that the IT-85 is not connected to the power outlet and not
turned on. Use your fingers to hold onto the upper portion of the tube
towards its tip. Gently rock the side of the tube to see if there is any
movement in the tube. If there is any movement that means the tube has
come loose. Press the tube firmly into its socket, using a gentle force and
a slight “rocking” motion.
3. Repeat the above procedure for the rest of the tubes. There are a total of
four output tubes and six input tubes in the VTL IT-85 integrated
amplifier.
4. Proceed to the connection and power up steps in this manual, watching
for any unusual glow in the tubes when powering up for the first time.
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5. Check that the tubes are stable under idle current draw into the desired
loudspeaker load and with all source components powered on (refer to the
checking bias section of the manual for instructions on how to do this).
6. Once the unit is functioning correctly, put the protective cage back onto
the IT-85 unit. Tighten the screws to make sure that the cage is securely
fastened to the unit.
IT-85 Front Panel
The full functionality of the VTL IT-85 Integrated amplifier can be accessed from the
front panel controls and switches. The following is a description of each control and
its function.
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The Input Selector is used to select the source component for the preamp section of
the IT-85. Choose any one of the 5 inputs by turning the selector knob to the
location as marked by the knob.
The Headphone output Jack accepts a ¼ inch stereo headphone jack. Insertion of the
headphone jack automatically mutes the pre-out (and subwoofer / Bi-amp).
The Headphone/Speaker selector switch is used to select between the use of
headphones or loudspeakers. Switching to headphone mutes the loudspeakers.
The Volume Control knob changes the loudness level of the output from the pre-
amp section to the amplifier section. Turning the knob clockwise will increase the
volume level, and turning the knob counter-clockwise will decrease the volume
level.
The Amp in/external Processor loop selector switch: In the default-operating mode
of the IT-85, this switch stays in the down position. This means that the IT-85 is
receiving the signal from the selected source component ( ie the volume is
controlled by the preamplifier section of the IT-85.) In the Processor position the
amplifier section of the IT-85 can be driven directly by an external source (eg. a
surround processor in home theater systems,) thereby bypassing the IT-85’s
preamplifier section and allowing the external surround processor to control the
volume of the front left and right channels. Engaging the Processor position
automatically mutes the pre-out.
The Mute switch is a momentary switch to allow you to toggle the preamplifier
section of the IT-85 between the mute and ready states. If the IT-85 is currently in
the operate mode press the switch down to mute. The Status LED light will start
flashing, indicating that the preamplifier section is in mute state. If the IT-85 is
already in mute state, pressing this switch down again will change the system back
into the operate mode.
The Remote Receiver window allows the transmission of signal from the remote
hand-held unit to be received by the IT-85. Keep this window clear from
obstruction to allow maximum signal transmission.
The Power On/Off switch is always used to turn the IT-85 on and off. Press the
switch up to turn the IT-85 ON and down to turn the unit OFF. The Status LED
should be on or off respectively, according to the setting of the Power On switch.
The Status LED indicates the powered on status of the IT-85. When powered on,
the LED light will blink to indicate the pre-amp section is muted, and then after 30
seconds, the LED will switch to steady state, indicating that the IT-85 is in
operating state. The LED is off when the system is powered off.
The IT-85 Rear View
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From the IT-85’s back panel, you can access the inputs, outputs, power connector, the
main fuse and B+ fuse holders, the serial number and voltage setting of the unit.
AC POWER
LEFT
RIGHT
MAIN FUSE B+ FUSE
Pre Out Tape Out Proc/Amp in Aux 2 Aux 1 Tuner Tape CD
IT-85 INTEGRATED AMPLIFIER
6A SB (120V)
3A SB (240V) 1 A FAST ACT
TO PREVENT ELECTRIC SHOCK DO NOT REMOVE COVER.
NO USER SERVICABLE PARTS INSIDE. REFER SERVICING
TO QUALIFIED PERSONNEL. FOR CONTINUED PROTECTION
AGAINST FIRE HAZARD, REPLACE ONLY WITH FUSES OF
SAME TYPE AND RATING. TO PREVENT FIRE OR SHOCK DO
NOT EXPOSE THIS APPLIANCE TO RAIN OR MOISTURE.
RIGHT
RISK OF ELECTRIC SHOCK
Manufactured by
Vacuum Tube Logic
Chino, CA USA
(909)627-5944 ++--SPEAKERS LEFT
Main Fuse
AC Power Receptacle
B+ Fuse Left Channel RCA Jacks (white)
Right Channel RCA Jacks (red)
Right channel Speaker Binding posts
Left channel Speaker Binding posts
Serial number and Voltage Information
The Main Fuse Holder contains the main power fuse.
CAUTION: Replace fuses only with fuses of same type and rating.
The Power Receptacle. is used for connecting the IT-85 to the AC power from a wall
outlet using the power cord.
The B+ Fuse Holder holds the B+ fuse
CAUTION: Replace fuses only with fuses of same type and rating.
The RCA Jacks. 5pairs of single-ended line inputs to connect your source
components to the preamplifier section of the IT-85, including CD, Tape, Tuner,
Aux 1 and Aux 2, and 1 pair processor loop/IT-85 inputs. 2 pairs of outputs
include 1 pair buffered pre-outs, and 1 pair fixed record outputs.
The Right channel binding posts. Connect right channel speakers to these binding
posts (make sure to observe the “+” and “-“ markings).
The Left channel binding posts. Connect left channel speakers to these binding posts
(make sure to observe the “+” and “-“ markings).
The Information label contains Serial number and voltage information.
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Connecting the VTL IT-85 Integrated amplifier to
your system
Caution: Prior to connecting the VTL IT-85 Integrated amplifier to any
audio equipment in your system, make sure this unit’s power (and the
rest of the equipment connected to its input and output channels) is
turned off. Adding or removing input or output cables to the IT-85 while
the system is powered on can cause damage to the system.
1. Before powering up your system, Make sure that the IT-85 and the source
components are powered off. Connect all source components (e.g. CD, Tuner,
Tape, DAT, Video Player etc.) to the inputs of the IT-85. For example, connect
the analog output cables from the CD player or DAC to the CD input connectors
of the IT-85. Use appropriate interconnects for the different sources. If a
direction indicator is printed on the cable make sure that the cable is connected to
the source and the IT-85 in the appropriate direction (arrows pointing in the
direction the signal will travel, i.e. from the source to the IT-85.) It is also
important that the left and right channels from the source components are
connected to the corresponding left and right channels of the IT-85 preamplifier
section.
2. Connect Surround Sound Processor to the IT-85 (if applicable). To take
advantage of the Surround Processor loop capability, connect the front left and
front right out of the external surround processor to the processor/amp in left and
right on the IT-85.
3. Connect the Tape input and output cables to the IT-85 (if applicable). To take
advantage of the tape record function, connect the Tape Out on your tape deck to
the Tape in on the IT-85 and connect the Tape Out on the IT-85 to the Record In on
your tape deck.
4. Connect your speaker cables to the speaker binding posts. Follow the “+” and “-
“ markings on the binding posts, as well as the right channel and left channel
markings in the IT-85.
5. Connect either your subwoofer line in to the pre-out, or your subwoofers speaker
binding posts to the IT-85 speaker binding posts (if applicable), or the second IT-
85 to the IT-85 pre-out (in a Bi-amplified system)(if applicable).
6. Connect headphones if desired (only connect headphones when in use, as
inserting the plug into the headphone jack will automatically mute the pre-out).
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7. Connect the supplied power cord to the AC receptacle on the back of the IT-85. If
you need a replacement and you are not sure what the appropriate cord should be,
consult your authorized VTL dealer or the VTL factory customer support
department.
Caution Before connecting the power cord into the wall outlet be sure
to read the next 2 very important sections on voltage setting and power
source for the IT-85
Voltage Setting
Your VTL IT-85 integrated amplifier has been set to the correct voltage for your
country where you made your purchase. The voltage setting is marked on the Serial
Number Badge located on the back panel of your IT-85.
Caution: Check to make sure that the voltage setting on your IT-85 is
correct for your local voltage rating before plugging in and turning on
your IT-85.
Power Source for the VTL IT-85 Integrated amplifier
Your IT-85 Integrated amplifier is a high-performance, high power amplifier, capable
of outputting up to 80 watts per channel. To assure best conditions for optimal
results, you should plug the unit directly into a wall AC outlet (if bi-amplifying you
should use one separate outlet for each amplifier). Do not plug your IT-85 into a light
extension cord or into the back of another component, as this will starve the IT-85 of
current and significantly impact the performance of your system.
See the chapter on Specifications for the power consumption requirements of
your IT-85.
Fitting the Batteries to the Remote Control
1. The back cover of the remote control is a sliding cover that is removable
by pressing down on the arrow and sliding the cover off in the direction of
the arrow to reveal the battery compartment. Remove the cover and put it
aside for re-installation later.
2. Locate the battery holder and insert the two AA batteries (supplied) in the
marked positions, + to + and - to -.
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3. Being careful not to damage the cover or the remote shell, replace the
back cover and slide it back into position with a snap.
4. After power up of the IT-85, test the remote control functions and ensure
that all the functions are working correctly. If the functions are not
working then check that the batteries are in the correct mounting positions
and that they are not stale. If you still encounter problems then you
should call the VTL factory or your VTL dealer.
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CHAPTER 3
Operating the VTL IT-85
Integrated Amplifier
Power on Stages
When you first power-on your IT-85 it goes through a warm-up stage which takes
approximately 30 - 50 seconds. During this period the IT-85 is in the muted mode, as
indicated by the blinking Status LED. After the warm-up stage is completed the IT-85
automatically goes into the operate state. The blinking status LED turns into a steady
light, indicating that the IT-85 is ready for use. Be sure to check the volume level while
the unit is in the warm up state so the volume does not come on too loud when the
IT-85 switches to operating state.
Powering your system on
After you have properly connected all your components to the IT-85 you are ready to
power your system on.
1. If you haven’t already done so, ensure that all the tubes inside the VTL IT-85 are
properly seated all the way into their sockets before connecting to an AC source.
(Refer to the factory or your local VTL dealer if you find that any tubes are loose
or broken). Also double check that your IT-85 is correctly set for your AC voltage.
2. Power on the source component(s) you intend to use for your listening session
3. From the IT-85’s front panel, check that the headphone/speaker switch is in the
appropriate position. If using headphones, ensure that they are properly
connected, or otherwise disconnect them. Make sure the Processor switch is in the
down position. Check to ensure that the volume control is at the minimum or
desired level. Press the Power on switch to turn on the IT-85. Check to make sure
that the Status LED indicates warm up mode, as indicated by the flashing Status
LED.
Caution: Ensure that there is no signal coming to the
IT-85 before powering up.
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Caution: It is recommended that for first power up, the headphones are
away from your ears until you are familiar with all of the controls of the
IT-85, as loud signals can damage your hearing.
Caution: When you turn on your IT-85 for the first time, watch the
tubes while they warm up and observe if any of them goes into an
exceptionally bright red glow on the outside of the large metal part
(plate) of any of the tubes. If this happens turn the system off
immediately and refer to your authorized VTL dealer or the VTL factory
service dept. This glow may indicate a defective tube that needs to be
replaced.
4. Once the IT-85 completes its warm up cycle (30-50 seconds), the Status LED will
stop flashing to indicate that the IT-85 is ready. In case the Status LED does not
behave as described above, turn the power switch to off. Check to make sure that
the power cable is securely connected to the AC Power connector in the back
panel of the IT-85, and that the power cable is firmly plugged into the AC supply
before powering on again. (Contact your VTL dealer if the unit still will not power
up after these checks have been performed.)
5. Adjust the Input Selector to the input source you would like to use. Make sure the
Processor switch is in default mode (down position) if you’re not utilizing this
function. Check that the volume control is in the correct position.
Caution: Make sure that the volume control is not set too high before
switching into or out of the Processor mode, as engaging this switch
in either direction can result in high signal levels.
6. Press play on the selected source component.
7. After warm up, if the IT-85 is in mute (Status LED is flashing) press the mute
switch down to remove the mute and return to operating mode. Turn the volume
control clockwise and listen to the volume increase until you get to the desired
playing level.
Caution: Before unmuting the IT-85, make sure that the volume
control is not set too high. The VTL IT-85 is capable of very high
signal levels. High signal levels can damage your speakers and your
hearing.
Caution: If powering on the system using the above steps results in
tripping a circuit breaker in your house, or blowing a fuse on the IT-85,
then turn off the power IT-85 and the rest of the system immediately.
Find the fuse box and turn the circuit on again to restore power to your
house. Contact your VTL authorized dealer or the VTL factory customer
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support department immediately so that they can help you resolve this
problem.
See the Biasing checking and Setting section for further information
about the operation of the output tubes in the VTL IT-85 Integrated
amplifier.
Ground Loop Hum
If you get a ground loop hum from your stereo system after installation and power up
you should immediately turn off the IT-85 and consult your VTL dealer or the VTL
factory.
Caution: Under no circumstances should you attempt to lift or defeat any
grounds on electrical equipment plugged into the AC, as these grounds are
installed for your and the equipment’s safety, and an ungrounded component
can present an extremely hazardous condition and is illegal under most
electrical safety codes. For your own safety please refer all questions of this
nature to a properly trained service technician
The Remote Control Hand-held Unit
The Remote Control hand held unit which comes with this IT-85, allows you to
perform some basic functions from the comfort of your seat:
• Increase/decrease the Volume Control by pressing the up and down
arrows respectively on the remote control hand-held unit.
• Set the system in mute or operate modes by pressing the mute button on
the remote control hand-held unit. This is a toggle control that changes
the operating state from one to the other each time it is pressed.
If the IT-85 is in mute, pressing the up arrow to increase the volume will
remove the mute to allow you to hear the change of the volume adjustment.
The volume down command will not change the mute state.
When you first press the buttons on the remote control unit, there is a delay of
a few seconds (about 1-2 seconds) before the IT-85’s completes the processing
of the signal sent by the remote. Wait for the response from the IT-85 before
pressing another button on the remote unit. During this processing period,
selection of other remote functions will be ignored. If more of one button is
pressed at once then the remote will perform no function. While the IT-85 is
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