Jbl ps 120 service manual

Page 2

ElBL PS 60/100/120

TABLE OF CONTENTS

Features ................................................................................ 1
Specifications ........................................................................ 2
Grille Removal Instructions .................................................. 2
Alignment Procedures .......................................................... 3
Test Procedure ..................................................................... 3
Powered Sub Test Setup ..................................................... 4
dB Meter Diagram 4
Circuit Description ..... _..5
Block Diagram ...................................................................... 6
Amplifier Exploded View ...................................................... 7
(Amplifier) General Unit Parts List ....................................... 8
For Models PS-GO/100/120

Cabinet Assembly Exploded View ....................................... 9
Cabinet Assembly Parts List .............................................. 10

for Models PS-60/100/120

FEATURES

I Big bass, very small box. Active equalization amplifier
circuitry delivers outstanding bass response by electric
compensation (EQ-ing) to extend the low frequency bass
response beyond the limits of a small enclosure.

I ALC circuit to protect driver. Automatic Level Control is
incorporated to regulate the maximum voltage to the
speaker. This prevents driver from being damaged and
ensures years of service.

I Adjustable crossover frequency and subwoofer output
levels allow a perfect sound match to your speakers.

I Small, magnetically shielded cabinet can be placed
anywhere in your room.

I Polarity switch allows normal and reverse polarity for
proper acoustic summation of your system regardless of
subwoofer placement.

I Line level and speaker level inputs and speaker level
outputs allow easy integration into your system.

I User friendly auto off and on. Signal sensing auto
shut-off/turn-on automatically puts the amplifier into

Packaging Exploded View .................................................. 11 A
Packaging Parts List ........................................................... 11

for Models PS-60/100/120

(Amplifier) Electrical Parts List ........................................... 12

for Models PS-60/100/120

Subwoofer Wire Assembly ................................................. 17

P. C. Boards (Model: P860) ............................................... 18

P. C. Boards (Model: P5100) ............................................. 19
Input-Output Characteristic ................................................. 20
Frequency Response .......................................................... 20

P. C. Boards (Model: P8120) ......

Circuit Diagram (Model: P860) .. ..21
Circuit Diagram (Model: P81 00) ........................................ 22
Circuit Diagram (Model: P5120) ........................................ 23

stand-by mode. effectively turning the subwoofer off and
on so you don't have to,

I Reliability: The PS series circuitry is designed to survive
common set-up errors that sometimes occur.

The PS product will accept switching of the polarity switch
while being fed full volume from signal source receiver/amplifier.

The PS product will accept (though not recommended
as permanent hook-up) line level signal in one channel and
speaker level input in the other channel.

The PS product will accept (though not recommended as
permanent hook-up) Lem line level signal and speaker level
input in the same channel.

The PS product will accept (though not recommended as
permanent hook-up) both line level signal and speaker level «
input in the same channel even with reversed polarity fed to
the speaker level input.

I Multicolor LED indicator

Fted signifies stand-by mode. The subwoofer is not receiving
any signal source. NOTE: The amplifier will go into the stand-by
mode after a period of 3 to 5 minutes of no signal.

Green signifies that it is receiving signal and the amplifier is on.

Amber signifies the protection mode. This will occur briefly
when the PS subwoofers power switch is turned on while a
signal is being sent from the signal source receiver/amplifier.
The amber LED would light in this case for about 8 seconds.