Read JBL SB 400 (serv.man8) Technical Bulletin online
Service Bulletin
Service bulletin # JBL2014-001
Nov. 2014
400 AT LANT IC STREET STAMFORD, CT 06901 USA
To:
JBL Service Centers.
Models:
SB400CNTR/230
Subject:
Preventive action / no sound in tweeters
Preventive action: In the event you receive an SB400CNTR/230 for repair, make sure to perform the following
modification, if it has not already been done: Change SMD coil FB810 to a 0 Ohm resistor on the back of the main
board to prevent damage to
modification, if it has not already been done: Change SMD coil FB810 to a 0 Ohm resistor on the back of the main
board to prevent damage to
tweeters or amplifiers
.
Part number:
ERS3D0000ZT0WS
No sound in tweeters:
Perform above preventive action. Check if tweeter or amplifier is damaged: replace defect parts.
Procedure:
• Gently remove the front speaker grill. Use a screwdriver, wrap tip in a clean cloth.
• Insert the tool into the gap at the end (as close to the middle holder as possible), see picture below:
• Use force to push the screwdriver downward, as indicated with the arrow in the picture below. This releases
the grill from the cabinet.
Service Bulletin
Service bulletin # JBL2014-001
Nov. 2014
400 AT LANT IC STREET STAMFORD, CT 06901 USA
• Lift the grill away from the cabinet with care, as shown by the arrows in the pictures below.
• Remove the 18 screws shown below, and lift off the front panel.
• Remove 6 screws on the main board as shown below.
Service Bulletin
Service bulletin # JBL2014-001
Nov. 2014
400 AT LANT IC STREET STAMFORD, CT 06901 USA
• For preventive action, change FB810 to a 0Ω resistor on the back of the main board, as shown below.
•
If tweeter or amplifier is damaged: replace defect parts.
• Reassemble and test the unit.
IRIS code: (For service centers using IRIS code reporting)
Preventive action: Use the below IRIS codes to report this modification as a second defect, within the same repair
Conditions
Symptoms
Section (Area) Defect (cause)
Repair (Remedy)
Position
IRIS CODES:
2
After a while
After a while
516
No sound from
speaker
No sound from
speaker
DPR
Signal
processing
(digital)
Signal
processing
(digital)
Y
Wrong component /
module
Wrong component /
module
I
Modification requested
by manufacturer
Modification requested
by manufacturer
FB810
Unit repair: Use the below IRIS codes to report this
Conditions
Symptoms
Section
(Area)
(Area)
Defect (cause)
Repair (Remedy)
Position
IRIS CODES:
1
Constantly
Constantly
516
No sound from
speaker
No sound from
speaker
SPK (PWA)
Speaker
(Power amp
section)
Speaker
(Power amp
section)
N
Defective electrical
component / module
Defective electrical
component / module
A
Replacement
Replacement
FB810, Tweeter
(amplifier board)
(amplifier board)