JBL Ms 8 Service Manual

 
      
MS-8 
 
8 Channel 
 
System integration digital processor 
 
 
SERVICE MANUAL 
 
 
 
 
 
JBL Consumer Products 
8500 Balboa Blvd. 
      Northridge, CA.  91329                  Rev0   5/2010 
Released 2010 
Discontinued XXXX  

 
 
-  CONTENTS  - 
 
SPECIFICATIONS ………………………………………\
..1 
PACKAGING……………..………………………….\
.…....2  NOTICE REGARDING TESTING THE UNIT…….….…3 
CONNECTIONS ……………………………..…………\
…4 
RESETTING THE MICROPROCESSOR………..…….15 
REMOTE CONTROL …………….….…………..………1\
6 
TROUBLESHOOTING……………..…..…………………17  EXPLODED VIEW/PARTS LIST……...….….………….22 
AMPLIFIER BLOCK DIAGRAM…….……………..….…23  ELECTRICAL PARTS LIST ..….…….……….…………26 
P.C.B. DRAWINGS….……………………………….……30 
IC/TRANSISTOR PINOUTS..…………….……….….…..37...

MS-8 PACKAGING
LITHIUM COIN BATTERY 3VDC  CR2032
 
 MS-8                      
 
 
 
2  

NOTE: Although some typical connections and 
controls are shown, the JBL
® MS-8 digital 
processor includes many features and digital 
controls not found on conventional car audio 
amplifiers. Also, the calibration, setup and 
usage for the MS-8 is unique. 
 
Details can be found in the MS-8 owner’s 
manual, which can be downloaded here: 
 
http://www.jbl.com/EN-US/Products/Pages/Pr oductDetails.aspx?PID=MS-8&accT=1&tsT=0&ovT=0 
 
(click on link) then on Grey tab SUPPORT
 
 MS-8...

www.jbl.com
POWER
IMPORTANT: Perform the power connections in the following order.
1.  Gnd:  Connect this terminal to a paint-free location on the vehicle chassis. 
IMPORTANT: Use at least 12-gauge wire for this connection.
EnglishCONN e CT i ON s
REMOVE
FOR
SOFTWARE UPDA TE
25A 
fuse
Mic 
connection
Line input
connections Hi Level input
Remote out
connection
Speaker outputconnections Line output
connections Aux input
connections Display
connection Power
LED
Reset
button Update
connection
+12V...

CONNeCTiONs


To turn-on
terminals of
all system
amplifiers
+
-
1 x 25A
25A fuse within
18" of battery
terminal
Cable from MS-8
+12V terminal
Use a grommet
through the
firewall
3.  Rem Out:  Connect this terminal to the remote turn-on terminals of all amplifiers in the system. The 
    output is +12V DC, 1A.
IMPORTANT:
	The	MS-8	MUST	control	the	turn-on	signal	of	all	the	other	amplifiers	
that follow the MS-8 in the signal path.
If
	your	system	includes	a	factory-installed	outboard	amplifier,	the...

e CT i ON s
English
Rem In: Connect this terminal to the remote turn-on output of the system’s source unit, if the 
source unit has a remote turn-on output. Alternately, you can connect this terminal to the vehicle’s 
accessory (ACC) power circuit. Any voltage over +4V DC at this terminal will trigger the MS-8 to 
turn on. 
NOTE: See Step 3 for more details about connecting the Rem In terminal to a factory-installed 
stereo system. 
AUDIO INPUTS
Many factory-installed systems include on-board...

CONNeCTiONs
Aftermarket head unit
MS-8 main unit Rear
line out
Front
line out
RCA
audio cables Subwoofer
line out
DO NOT USE
Line inputs1 and 2
Connecting an aftermarket head unit
If you’re using the MS-8 with an aftermarket head unit that has RCA-type outputs, connect the head unit’s 
front left and front right outputs to the MS-8’s line inputs 1 and 2 only. Do NOT connect any other head-unit 
output signals to the MS-8’s line inputs 3 – 8. During the calibration/setup process, the MS-8 will...

ONNeCTiONsEnglish
Connecting a factory radio/head unit
If you will be connecting the MS-8 to a factory-installed stereo or a factory-installed amplifier (often located in 
the vehicle’s trunk), connect each of your factory front-speaker and subwoofer outputs to one of the MS-8’s Hi 
Level inputs. Be sure to connect the outputs for all speakers that are part of the vehicle’s front left and front right 
speakers.
You can connect the factory front speaker outputs to any MS-8 Hi Level inputs, but factory...

CONNeCTiONs
Aux 
input
To
headphone
output
Aux input:  If you will be using a portable music player or CD player as an auxiliary audio-source unit, 
connect its line or headphone output to the MS-8's Aux input using a cable that terminates in stereo 
RCA audio connections. You can switch between the MS-8's Head Unit inputs and Aux input in the 
MS-8's Input Selection menu. See  Main Menu, on page 35.
10
CONNECTIONS
 
 MS-8                       
 
    
9