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.  . 

POWER 

OPERATING 

INSTRUCTIONS 

NOTICE 

Read  this  manual  before operating 

the 

Power  Amplifier. 

..

 

FEATURES 

100 

Watts of Output  Power at  Less  than 

1% 

from 

Automatic  Transfer  to  Battery 

if  AC  Power 

35 

Hz  to 20 kHz 

Fails 

Transformer-Isolated  Outputs for 

and 

16 

and 

Low Power Consumption 

for 

and 

Distribution Systems 

Low Heat Generation 

Switchable 

Filter  Protects Driver  Loudspeaker 

from Excessive Low-Frequency Power Demands 

Hinged Front Panel for 

Exclusive 

Dissipation  Sensing  Circuit  Protects 

Output Transistors 

Small Size 

AC 

or  Battery Operation 

Light Weight 

Summary of Contents for 1594B

Page 1: ...onif AC Power 35 Hz to 20 kHz Fails Transformer Isolated Outputs for 4 8 and 16 Ohms and Low Power Consumption for 25V and 70 7V Distribution Systems Low Heat Generation Switchable Highpass Filter Protects Driver Loudspeaker from Excessive Low Frequency Power Demands Hinged Front Panel for Easy Maintenance Exclusive Active Dissipation Sensing Circuit Protects Output Transistors Small Size AC or Ba...

Page 2: ...QUES Transistor Orientation Replacing Power Transistors Testing Transistors Replacing PCB Components Repairing Fractured or Damaged PCB Conductor Characteristics Figure 3 Typical THD Versus Frequency for 100 Watt Output Figure 4 Typical THD Versus Wattage Out put at 1000 Hz 8 OhmLoad Figure 5 Front View With Hinged Panel Open Figure 6 Rear View of 15948 Power Amplifier Figure 7 Converting to 240V ...

Page 3: ...ypically less than 10 of load impedance 85 dB below rated output 1 VOLUME control continuously variable 1 primary power ON OFF switch 1 FILTER IN OUT switch rear panel 1201240V ac 50160 Hz 20W at zero signal 180W at 33W output 290W at 100W output or 24128V dc 0 2A at zero signal 5 OA at 33W output 8 5A at 100W output Battery minus is ground Up to 5 5 131 F ambient 7 H x 1 9 W x 8 112 D 35 pounds 8...

Page 4: ...helf use I t tilts the 15948 for easy accesr to front panel controls The sides and top extend beyond the front panel to preventaccidental changes of control settihgs The cover provides easier handling for portability and i t is sturdy enough to support lightweight equipment placed on top of it Four polyethylene feet prevent marring of sur faces The ALTEC green finish matches the front panel of the...

Page 5: ...lation past the output transistors ELECTRICAL 120 Volt 50160 Hz Power Connections Equipment supplied for domestic use is provided with the power transformer primary strapped for 120 volts terminals B A T T E R Y P O W E R TERMINAL BOARD TB4 1 to 2 and 3 to 4 on TB3 The power input nameplate adjacent to the power cord on the chassis is mounted to show the appropriate side specifying the connections...

Page 6: ...hen shipped from the factory pins 3 and 4 of J1 are strapped together to provide a 600 ohm input A 150 ohm input may be obtained by removing the strap from pins 3 and 4 and then strapping pins 1 and 4 and pins 3 and 6 see Figure 8 I Direct Coupled Isolated linesof 150or 600ohms up to level of 15 dBm with 15095A Line Transformer For low impedance line bridging input or 15K ohrn line matching input ...

Page 7: ... see Figure 2 A screwdriver operated FILTER IN OUT switch is located on the rear of the chassis see Figure 6 The switch is placed in the OUT position when the 15948 is hipped from the factory SERVICE If a malfunction occurs service should be performed by an ALTEC Qualified Service Representative For factory ser vice ship the 15940 prepaid to Customer Service ALTEC 1515South Manchester Avenue Anahe...

Page 8: ...the required length and insert them properly indexed into the PCB or socket ReplacingPower Transistors The ac primary power fuse is mounted on the front panel see cover photo The battery power fuse is located on the rear of the chassis see Figure 6 I f fuse replacement is re quired determine and correct any cause of failure before re plac ng fuse Install an identical fuse see PARTS LIST by unscrew...

Page 9: ...Lead 1 Emitter TO 5 L e a d 2 B a s e Lead 3 Collector P Case 3 If component is faulty or damaged clip leads close to component and then unsolder leads from board With draw leads from component side 4 Clear solder from circuit board holes before inserting leads of new component Heat solder remaining in hole remove iron and quickly insert a pointed non metallic object such as a toothpick from condu...

Page 10: ...VE PCB ASSEI BLY A l I I I I 3 I t i I i 1 I I N LOWERED POSITION 1 13 Figure 10 Component Locations Inside Main Chassis T 1 VOLTAGE Q b Q5 TBI RATING PLATE SINK Figure 11 Component Locations on Rear of Chassis ...

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Page 13: ...2N5305 selected Transistor 2N2712 selected Transistor 2N3906 selected Transistor 2N5308 low noise selected 47 01 102169 01 Res 3 3Ka 210 Il14W 48 03 107447 02 47 06 042509 01 47 01 100635 01 47 02 105885 01 47 01 100652 01 47 02 114449 01 47 01 102054 01 47 01 102057 01 47 02 112166 01 47 01 102551 01 47 02 100715 01 47 02 100712 01 47 01 102376 01 47 01 100479 01 47 01 102190 01 47 01 102171 01 4...

Page 14: ... Res 3 3 R z L 114W Pot 10a 2 2 W Res 330Q 210 1W Res 27Q 10 li4W Res 47Q 10 1 2W Res 180a lo 112W R136 137 R138 133 Res 56a 10 114W 47 05 y697 01 F a r i i 47 01 102355 01 Res 3 3K Q 5 1 4W Res 22Ka 10 21 04 101034 01 1 IITB4 I Name and Description Res 47Q f10 1 4W Res 220 Q lo 114W Pot 5 0 n 2 0 2W y t Rer 1KCZFIOI 112W Switch DPDT slide Switch toggle 125V ac 3A 20V dc 5A Transformer power Trans...

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