IMAXIM Issue 2 12.01.99 MAXIM Amplifier Operating Instructions Baldwin Boxall Communications Ltd. Wealden Industrial Estate, Farningham Road Crowborough, East Sussex, TN6 2JR Telephone: 01892 664422 Fax: 01892 663146 Email: firstname.lastname@example.org MAXIM DESCRIPTION AND SPECIFICATIONS 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 12. 13. 14. 120W RMS Power Output. Mains or 24V DC Battery powered with silent changeover. Four balanced microphone inputs via 180º and 240º DIN sockets. Each input has the option of cascade priority via internal switch selection. As supplied each input has the chime and volume restoration/busy enabled, this is selectable via an internal diode matrix (see fig 1). Optional three note chime (plug in module OPT33) with pre-set volume control. Master volume, treble and bass controls. Auxiliary stereo music input (internally mixed) to accept tuners, CD players or tape decks. Music mute facility which allows music to be ‘ducked’ to a pre-set level when paging operated. Remote music mute input from time clocks etc. 24V DC output. “Volume Restoration” relay to provide simple zoned output (e.g. paging only) Open collector “Busy” output to drive indicators etc. Auxiliary output to feed slave amplifiers, tape decks etc. SAFETY Ventilation Always ensure adequate ventilation to the amplifier : do not obstruct ventilation holes in cover or base. AC Power Input - Danger High Voltage Only connect to an AC 50-60 Hz 230V supply using the lead assembly supplied or an equivalent type with a suitable IEC connector. Always ensure that the amplifier is earthed. Always unplug the power before removing the top cover. 100V Loudspeaker Output - Danger High Voltage Ensure that the loudspeaker connections are suitably protected and cannot be touched. Always replace output plug insulated covers. Always ensure that the total speaker load does not exceed 120 Watts. If unsure use an impedance meter to measure the unknown load. Using a multimeter selected to the resistance range ensure that the speaker line is not connected to earth. Moisture Do not allow water to come in contact with the amplifier and its external connections. Cable Types Always ensure that the correct cable type is used for the signal level. A twin screened cable should be used for balanced inputs operating at mic level. Zone selection and access control cables do not generally require screening and should not share the same screen as the balanced input. Loudspeaker output cables should be rated in excess of 100V and the cross sectional area to suit the load without excessive power loss. Always ensure that output cables are kept as far away from input cables as possible reducing the risk of instability. Fuses Always replace using the correct rating and type to ensure safe operation. MAXIM 120W TECHNICAL SPECIFICATION Rated output power 100V Line 230V AC Supply THD 1kHz rated output Aux input 230V AC Supply Typical output power 1% THD Aux input 230V AC supply Output regulation (1kHz 100V Line) Output voltages obtainable (Pin selection) Supply Voltage Power Consumption Quiescent Rated Output Power @ 1kHz Fuse Protection 1 x AC Supply 20 x 5mm 1 x DC (amplifier) auto blade 1 x Battery Supply auto blade Aux input stereo summed mono Sensitivity Frequency response – 3dB@ Signal to noise ratio Mic Input Sensitivity Frequency response –3dB@ Signal to noise ratio terminated 200 Ohms Tone Controls Bass Treble Auxiliary Output Output Level Recommended load impedance 120W 83 Ohms Less than 0.5%, typically 0.2% 150W 66 Ohms Better than 1.3dB 50 & 100V 22-35V DC 220-240V 50-60Hz AC 120mA 9A 18VA 300VA 3.15A (T) 15A (F) 15A (F) 120mV @ 20k Ohms 40Hz – 20kHz Better than 80dB 600!V Balanced @ 660 Ohms 60Hz – 12kHz Better than 60dB +/- 12dB @ 100Hz +/- 12dB @ 12kHz 400mV @ 1kOhm Greater than 10kOhm System busy output Busy / Restoration relay output DC Aux output Open collector 0.5A @ 40V total max. 2 pole changeover 5A @ 100V max. Self resetable fuse 30V @ 1.5A max Terminations AC supply input DC Battery input Aux input Mic input Sub socket Busy / Restoration relay output Loudspeaker line output Dimensions (mm) (D x W x H) Weight 3-pin DIN IEC 6A 3-pin Screw terminated connector 180" 5 pin DIN stereo summed mono 180" 5 pin & 240" 6 pin DIN 180" 5 pin & 240" 5 pin DIN 8-pin, Screw terminated connector 3-pin Screw terminated connector 340 x 430 x 90 12kg CASCADE PRIORITY AND DIODE MATRIX CASCADE PRIORITY Cascade Priority can be selected on the four microphone inputs using the “Priority Select” DIL switch on the PCB. As supplied from the factory the 4 microphone inputs mix and do not override the music input. To enable a microphone input to override the music input and lower priority microphone inputs the relevant switch should be set to “ON”. DIODE MATRIX As supplied from the factory each microphone input (when accessed) enables the chime, Busy output, and Volume Restoration relay. To prevent an input having one of these facilities then the relevant diode should be cut out of circuit. Remove the following diode to prevent the facility Input 1 2 3 4 Rest Relay D7 D10 D13 D16 Busy D8 D11 D14 D17 Chime D9 D12 D15 D18 D9 A D7 D8 Fig 1 Shows the position of the “Priority Select” switch (A) and the location of the diodes in the matrix for input 1 (D7 – D9).