valutazioni - 3, GPA: 4.3
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O. Box 26105 o Oklahoma Cily. OK « 73126-0105 USA © Tel: (405) 324-5311 e FAX: (405) 324 Operating and Service Instructions for the Altec Lansing 9441A Power Amplifier Table of Contents 1 ELECTRICAL..............................................................' 1 1.1 120 V ac, 50/60 Hz Power Connections..............................................................................1 1.2 220/240 V ac, 50/60 Hz Power Connections........................................................................1 2 INSTALLATION..........................................................................................................................1 2.1 Rack Mounting .............................................................1 2.2 Ventilation ............................................................................1 3 SIGNAL CONNECTIONS..........................................................................................................2 3.1 Input Connections ................................................................2 3.2 Line Output Connections..................................................................................................2 3.3 Output Connections................................................................................................................2 3.4 Output Cable Selection........................................................................................................2 3.4.1 Calculating Power Losses with 8 ohm Loads............................................................ 2 3.4.2 Calculating Power Losses with 4 ohm Loads........................................................2 3.5 Damping Factor....................................................................................2 3.5.1 Calculating the Maximum Length of Cable for a Specified Damping Factor....................3 3.6 Speaker Protection Fuse Selection ......................................................................................5 3.7 Compression Driver Protection Capacitors ..........................................................................5 4 OCTAL ACCESSORY SOCKETS...........................................................5 5 PROTECTION SYSTEMS ...................................................................................5 5.1 Load Protection Circuitry......................................................................................5 5.2 Amplifier Protection Circuitry ............................................................................................5 5.3 Protect Indicator.......................................................................................6 0 OPERATION........................................................................................................6 6.1 Dual Mode of Operation..............................................................................................................6 6.2 Bridge Mode of Operation ................................................................................................6 7 IN CASE OF PROBLEMS ...................................-..............................6 8 SPECIFICATION....................................................................................................................7 9 SERVICE INFORMATION....................................................................................................10 9.1 Equipment Needed..............................................................................................................11 9.2 Adjusting SVR1 and SVR2, the BIAS Trimpots....................................................................11 9.3 Ordering Replacement Parts ..............................................................................................11 9.4 FacLory Service .................................................................11 9.5 Technical Assistance ..........................................................................................................11 ALTEC LANSING* CORPORATION ® a Mark /V Company Operating and Service Instructions for the Altec Lansing 9441A Power Amplifier 1 ELECTRICAL Two amplifier models are available. One model has a 50/60 Hz power transformer with two 120 V ac primary windings. These windings may be wired in parallel or series lor operation at either 120 V ac or 220/2*10 V ac. The other amplifier model is for export into countries where the ac line voltage is 100 volts, 50/60 IIz. The next two sections refer to the first model with the dual 120 V ac primary windings. 1.1 120 V ac, 50/(50 Hz Powex* Connections The amplifier is provided with the primary of the power transformer strapped for 120 V ac operation from the factory. Refer to Figure 2 for the wiring details. WARNING: Verify that the power transformer’s primmy circuit configuration is correct for the intended ac line voltage BEFORE applying power to the amplifier. 1.2 220/210 V ac, 50/G0 Hz Power Connections The power transformer has two 120 ...