Infinity Reference 310a Service Manual

- CONTENTS -
SPECIFICATIONS ………………………………….……..1
FEATURES/TEST CONDITIONS……..…………………2
CONTROLS/CONNECTIONS………….……..…...…..…3
INSTALLATION………………….……...……..…...…...…5
BASIC TROUBLESHOOTING..…….…….………………6
TYPICAL SYSTEM WIRING..…….…….……………..…7
EXPLODED VIEW/PARTS LIST…….….….…………....8
MECHANICAL PARTS LIST……………..…………........9
AMPLIFIER BLOCK DIAGRAM…………………………10
P.C.B. DRAWINGS….…………………………………….11
ELECTRICAL PARTS LIST ……………………………. 14
REF 7521a ELECTRICAL PARTS LIST ADDENDUM….……17
IC/TRANSISTOR PINOUTS………………………………18
REF 7520a SCHEMATICS……………………………....20
REF 7521a SCHEMATICS…………………………..…..22
PACKING…………………………….…………………....24
Reference 7520a/7521a Specifications
Output Power: 97W RMS x 2 channels @ 4 ohms; ≤1% THD + N
(14.4V supply) 142W RMS x 2 channels @ 2 ohms; ≤1% THD + N
283W RMS x 1 channels @ 4 ohms; ≤1% THD + N
Signal-to-noise ratio: 83dBA (reference 1W into 4 ohms)
Dynamic power: 190W @ 2 ohms
Effective damping factor: 6.389 @ 4 ohms
Frequency response: 10Hz – 69kHz (–3dB)
Maximum input signal: 5.5V
Maximum sensitivity: Reference 7520a - 240mV
Reference 7521a - 75mV
DC Offset <50mV (-50%)
Output regulation: .078dB @ 4 ohms
Idle Current 900mA
Input Impedance 22kΩ
Max Current Draw 22A @ 4 ohms
37A @ 2 ohms
Dimensions: 12 x 11 7/16 x 2 11/16” (L x W x D)
(305mm x 290mm x 68mm)
Fuse: 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.
1
Power Amplifier Reference 7520a/7521a

Infinity Reference 310a Specifications

General

Brand	Infinity
Model	Reference 310a
Category	Amplifier
Language	English