JBL Media SUB Service manual
Media Sub
TECHNICAL MANUAL
Single 5.25" Powered Multimedia Subwoofer
JBL Consumer Products Inc.
250 Crossways Park Dr.
Woodbury,N.Y.11797
1-800-336-4JBL in the USA
A Harman International Company
Rev B 4/02
Powered Subwoofer Media Sub
TABLE OF CONTENTS
FEATURES.....................................................................1
SPECIFICATIONS..........................................................1
MEDIA SUB EXPLODED VIEW ...................................2
DISASSEMBLY PROCEDURES ...................................3
BLOCK DIAGRAM .........................................................4
PCB1&2(viewing trace layer through the board) .....5
PCB1&2(viewing silk-screen through the board) .....6
FEATURES
Powered subwoofer system.
n
25 watt amplifier.
n
Auto turn-on / turn-off circuitry.
n
Subwoofer is magnetically shielded for flicker-free use
n
near computer monitors.
PCB 3 (viewing trace layer through the board) ............7
PCB 3 (viewing silk-screen through the board) ............8
ELECTRICAL PARTS LIST ...........................................9
PACKAGINGEXPLODEDVIEW.................................11
INTEGRATEDCIRCUITDIAGRAMS..........................12
SCHEMATICDIAGRAM..............................................13
Built-in electronic equalization for proper frequency
n
balance with satellite speakers.
Line level stereo output for use with satellite speakers
n
that don’t have a subwoofer output.
SPECIFICATIONS
Speaker System...........Sixth band-pass enclosure
Speaker Size............5.25” woofer
Total Amplifier Output Power ......25Wat10%THD
Input Sensitivity ...........250mV input for full power
Frequency Response .........40Hz - 150Hz
Input Impedance ..........10kohms
Signal Output jack ..........Stereominiplug jack (1/8")
Signal Input Jacks ..........Stereominiplug jack (1/8")
External Dimensions
Height ..............10.25"
Width ..............7.35"
Depth..............12"
Weight ..............12.8 lbs.
External Dimensions (metric)
Height ..............260mm
Width ..............186mm
Depth..............305mm
Weight ..............5.8kgs
1
MEDIA SUB EXPLODED VIEW
Powered Subwoofer Media Sub
DISASSEMBLY PROCEDURES
Step 1
Remove the 8 purchase screws (S6) from the rear plate to separate the rear plate and the wood cabinet.
Step 2
Unplug the connector speaker wire from the PCB amp assembly.
Step 3
Remove the 4 purchase screws (S5) from the rear plate to separate the rear plate and cover.
Step 4
Remove the power/volume knob from the rear plate.
Step 5
Remove the 4 purchase screws (S2) and nuts (N1) to separate the rear plate and transformer assembly.
Step 6
Remove the 2 purchase screws (S3) from the bracket and the 2 purchase screws (S4) and nuts (N2) from
the IC of STK4024 to separate the rear plate and Amp assembly.
Step 7
Remove the 4 purchase screws (S1) from the driver inside the wood cabinet to separate the wood cabinet
and the driver.
3
BLOCK DIAGRAM
Loading...