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I R T Electronics Pty Ltd A.B.N. 35 000 832 575
26 Hotham Parade, ARTARMON N.S.W. 2064 AUSTRALIA
National:
Phone: (02) 9439 3744
Fax: (02) 9439 7439
International:
+61 2 9439 3744
+61 2 9439 7439
Email: sales@irtelectronics.com
IRT Eurocard
Type AA-704 & AA-704T
Audio Distribution Amplifier
Designed and manufactured in Australia
page 1 of 23
25/05/98
0704-aa.ibw.doc
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Summary of Contents for IRT AA-704
- Page 1 National: Phone: (02) 9439 3744 Fax: (02) 9439 7439 International: +61 2 9439 3744 +61 2 9439 7439 Email: sales@irtelectronics.com IRT Eurocard Type AA-704 & AA-704T Audio Distribution Amplifier Designed and manufactured in Australia page 1 of 23 25/05/98 0704-aa.ibw.doc...
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Page 2: Table Of Contents
IRT Eurocard Type AA-704 & AA-704T Audio Distribution Amplifier Instruction Book Table of Contents Section Page General description Technical specifications Technical description Internal adjustments Configuration Installation Operational safety Pre-installation Installation & connection RCA phono rear assemblies - RB704 & RB-367... -
Page 3: General Description
Except where noted all references to the AA-704 in this instruction book apply equally to the AA-704T. The AA-704 can be used for either mono or stereo signals, a simple on board jumper change is all that is required to vary the mode of operation. - Page 4 Accessories available:- FR-700 Eurocard module mounting frame:- Provides mounting for up to 12 AA-704 amplifiers and one PT-700 Dual AC power supply side by side in 134 mm of standard Rack space (3 Rack Units). FR-722 1 RU chassis conversion/PSU The FR-722 provides a means of converting Eurocards to a 1 rack unit format.
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Page 5: Technical Specifications
Other: Temperature range 0 - 50° C ambient Mechanical Suitable for mounting in IRT 19" rack chassis types FR-700 & FR-722 with input output and power connections on the rear panel Finish: Front panel Grey enamel, silk screened black lettering & red IRT logo... -
Page 6: Technical Description
TECHNICAL DESCRIPTION The block diagram (ref.. 802827) shows that the AA-704 comprises:- a) Two separate input stages, "Left" and "Right. Each input stage converts its balanced high impedance input to an unbalanced low impedance output. The gain of these stages can be varied by 12 dB in two 6 dB steps by changing the stage gain links. -
Page 7: Internal Adjustments
AA-704 Internal Adjustments The following adjustable resistors are factory set and should not be adjusted unless a component has been changed. They are not 'operational' controls. Before adjusting any of these controls allow time for the AA-704 to reach temperature stability. -
Page 8: Configuration
CONFIGURATION The AA-704 may be configured for several modes of operation including remote control and conversion to a multi output oscillator with the addition of sub-modules. This is achieved by various link settings as outlined below. The AA-704 is normally delivered set for stereo operation, 6 dB maximum gain on both channels and no sub-modules fitted. -
Page 9: Installation
INSTALLATION Operational Safety WARNING Operation of electronic equipment involves the use of voltages and currents which may be dangerous to human life. Maintenance personnel should observe all safety regulations. Do not change components or make adjustments inside the equipment with power ON unless proper precautions are observed. Note that under certain conditions dangerous potentials may exist in some circuits even though power controls are in the OFF position. -
Page 10: Installation & Connection
AA-704 with the RB-367 as the RB-367 covers the entire rear of the frame. The AA-704 module must be mounted on the right hand side of the frame (next to the power switch) and a blank front panel should be secured in the unused position on the left hand side. -
Page 11: Front And Rear Location Diagrams
The following front panel and rear assembly drawings are not to scale and are intended to show approximate layout & connection order only. AA-704 RB-733 RB-733 L O/P’s R O/P’s L O/P’s R O/P’s GAIN Remote 600 Ohm 600 Ohm... - Page 12 RB-733 Rear assemblies with RCA type L O/P’s R O/P’s L O/P’s R O/P’s L O/P’s R O/P’s output connectors. Note input connectors may be either RCA unbalanced or Phoenix balanced type. Remote 1 2 3 LEFT RIGHT & MONO INPUT INPUT RB-367...
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Page 13: Sub-Modules
IRT Eurocard Sub-board Type CAA-3131 GENERAL DESCRIPTION This plug-in option for selected IRT audio distribution amplifiers can be configured to provide one of the following modes of operation: • STEREO FADE over 75 dB range • STEREO TRIM of 6 dB •... -
Page 14: Remote Control
CONFIGURATION The main module must first be configured to accept the sub-module. This is achieved by various link settings as outlined in the main module manual. The main module is normally delivered set for stereo operation and no sub-modules fitted. Before installing the CAA-3131 set the main module to stereo mode as detailed in main module instruction manual. -
Page 15: Ag-604Sw Switched Frequency Oscillator
IRT Eurocard Sub-module Type AG-604SW GENERAL DESCRIPTION The AG-604SW Four frequency switched oscillator sub-module converts the supporting main module audio distribution amplifier into a multi output reference oscillator for test or alignment purposes. Provision is made to remotely switch the frequency to a fixed 400 Hz, 1 KHz, 4 KHz or 10 KHz tone. - Page 16 CIRCUIT DESCRIPTION The circuit comprises of a low distortion Wein bridge oscillator with a remote control facility to select the operating frequency. The normal input circuitry of the distribution amplifier is not used. Control of frequency is by way of grounding contacts which activate relays on the sub-board to select the correct time constants in the circuit.
- Page 17 INSTALLATION Module To install the sub-module onto the main module first ensure that the proper mode of operation has been selected on both the main and sub-modules. Then remove straps LK 1 and LK 2 on the main module. Hold the sub-module so that the legends on the sub-board and the legends on the main module have the same orientation.
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Page 18: Ag-604St Stereo Oscillator
IRT Eurocard Sub-board Type AG-604ST GENERAL DESCRIPTION The AG-604ST provides a continuous 1 KHz tone signal on the left channel and the same signal interrupted every second on the right channel. This configuration conforms to the recommended practice of FACTS (Federation of Australian Commercial Television Stations) for channel identification. - Page 19 CONFIGURATION The main module must first be configured to accept the sub-module. This is achieved by various link settings as outlined in the main module manual. The main module is normally delivered set for stereo operation and no sub-modules fitted. Before installing the AG-604ST check that the main module is set to stereo mode as detailed in main module instruction manual.
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Page 20: As-604 Remote Mode Control
IRT Eurocard Sub-board Type AS-604 GENERAL DESCRIPTION The AS-604 can remotely switch between mono and stereo modes or reverse the phase of the left channel in stereo mode. Links on the board allow a choice of either a -3 dB or -6 dB mono mix. :-(Only one mode is possible at any time.) - Page 21 CIRCUIT DESCRIPTION The AS-604 is comprised of a single operational amplifier in series with the left channel audio whose gain is determined by four relays which determine the path and thereby the amplitude of the signals in the circuit. With no relays activated the amplifier functions as a voltage follower and has no effect on the phase or gain of either channel.
- Page 22 Remote control AS-604 can be remotely switched to provide one of the following modes of operation:-(Only one mode is possible at any time.) 1. Normal stereo operation. 2. Reverse phase of left channel 3. Switch left channel input to mono output. 4.
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Page 23: Drawing List Index
Drawing list index Unless otherwise specified all references on diagrams to AA-604 refer equally to the AA-704. Drawing # Sheet# Description 802827 AA-604 block diagram 802735 AA-604 main circuit schematic 803538 RB-733 rear assembly with Phoenix connectors 803664 RB-733T rear assembly with Krone IDC connectors...
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