Jbl 6290 service manual

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BEFORE PROCEEDING WITH COMPLETE UNPACKING AND SETUP
PLEASE READ THE SECTION ON UNPACKING AND INSPECTION

Y UREI
ELECTRONIC
PRODUCTS
model 6290
POWER AMPLIFIER

JBL Incorporated
8500 BALBOA BOULEVARD
P.O. BOX 2200
NORTHRIDGE, CA. 91329 USA
PHONE: (818 ) 893-8411
TELEX: 4720424

SERVICE ADDRESS:

UREI Incorporated
8400 BALBOA BOULEVARD
NORTHRIDGE, CA. 91325-4100 USA.
PHONE: (818) 895-UREI (895-8734)
FAX: (818) 891 -5475

©cprright 1988, JBL Incorporated

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TABLE OF CONTENTS

SECTION I. INTRODUCTION
1.1 SPECIFICATIONS
SECTION II. INSPECTION AND INSTALLATION

2.1 UNPACKING AND INSPECTION
2.2 ENVIRONMENTAL CONSIDERATIONS
2.3 AC POWER
2.4 AMPLIFIER MODE SWITCH

2.5 EXTERNAL CONNECTIONS

2.5.1 INPUT CONNECTIONS, GENERAL

INPUT CONNECTION, DUAL MONO MODE

INPUT CONNECTION, BRIDGED MONO MODE
FIVE-WAY BINDING POST OUTPUT CONNECTORS
ABOUT OUTPUT POLARITY AND BRIDGED MONO
CONNECTION

INPUT IMPEDANCE AND TERMINATION

APPROPRIATELY RATED LOADS

2.7.1 IT IS THE USER'S RESPONSIBILITY TO AVOID

OVERPOWERING

2 MORE ABOUT LOUDSPEAKER POWER RATINGS
3 SOMETIMES A LARGER AMPLIFIER CAN BE SAFER
4 REMEMBER THE DIVIDING NETWORK (CROSSOVER)
ER CABLES
1

2

3

NNNN
mmmul

UIJ>UIN

o
u
0
o

NN
- n
\10

TYPE OF WIRE

DAMPING FACTOR

CALCULATING LOSSES IN SPEAKER CABLE
2.9 GROUNDING

2.10 SECURITY COVERS

FIGURE 2- BALANCED INPUT CONNECTIONS

2.7
2.7
2.7
2.8 SPEA
2.8
2.8
2.8

FIGURE 2-2 UNBALANCED INPUT CONNECTIONS
FIGURE 2-3 BARRIER STRIP CONNECTIONS

FIGURE 2-4 USE OF FIVE-WAY BINDING POSTS
FIGURE 2-5 OUTPUT CONNECTIONS TO TWO CHANNEL

SPEAKER SYSTEM
FIGURE 2-6 BRIDGED OUTPUT CONNECTION TO MONAURAL
SPEAKER SYSTEM

SECTION III. OPERATING INSTRUCTIONS

3.1 GENERAL
3.2 TURN ON AND SYSTEM CHECK

3.2.1 A NOTE ON AMPLIFIER COOLING
3.3 CLIP INDICATORS

3.3.1 ABOUT SENSITIVITY RATINGS

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