Infinity 5760a, Service Manual

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- CONTENTS -
SPECIFICATIONS ………………………………….……..1
FEATURES/TEST CONDITIONS……..…………………2
CONTROLS/CONNECTIONS………….……..…...…..…3
INSTALLATION………………….……...……..…...…...…5
BASIC TROUBLESHOOTING..…….…….………………7
TYPICAL SYSTEM WIRING..…….…….……………..…8
EXPLODED VIEW/PARTS LIST…………………..….....9
MECHANICAL PARTS LIST…………………………….10
AMPLIFIER BLOCK DIAGRAM…………………………11
P.C.B. DRAWINGS….…………………………………….12
ELECTRICAL PARTS LIST ……………………………. 16
REF 5761a ELECTRICAL PARTS LIST ADDENDUM
….……20
IC/TRANSISTOR PINOUTS..……………………….. …..21
REF 5760a SCHEMATICS……………………………....24
REF 5761a SCHEMATICS…………………………..…..28
PACKING…………………………….……………………32
Reference 5760a/5761a Specifications
Output Power: 56W RMS x 4 and107W RMS x 2 channels @ 4 ohms; ≤ 1% THD + N
80W RMS x 4 and150W RMS x 2 channels @ 2 ohms; ≤ 1% THD + N
148W RMS x 2 and 287W RMS x 1 channels @ 4 ohms; ≤ 1% THD + N
Signal-to-noise ratio: 82dBA (reference 1W into 4 ohms)
Dynamic power: 117W channels 1,2,3,4; 163W channels 5,6 @ 2 ohms
Effective damping factor: 6.373 @ 4 ohms
Frequency response: 10Hz – 57kHz channels 1,2,3,4; 10Hz – 302Hz channels 5,6
Maximum input signal: 6.3V
Maximum sensitivity: Reference 5760a - 230mV
Reference 5761a - 75mV
DC Offset <50mV (-50%)
Output regulation: .063dB @ 4 ohms
Idle Current 2.1A
Input Impedance 22k Ω
Max Current Draw 34A @ 4 ohms
88A @ 2 ohms
89.5 @ 4 ohm bridged
Dimensions: 12 x 18 1/2 x 2 11/16” (L x W x D)
(305mm x 470mm x 68mm)
Fuse: 2 x 30A
Infinity continually strives to update and improve existing products, as well as create new ones. The specifications and details in
this and related JBL publications are therefore subject to change without notice.
Power Amplifier
Reference 5760a/5761a
1