BP 600.1 (serv.man4) - JBL Car Audio Technical Bulletin (repair manual)

bp 600.1 (serv.man4) technical bulletin
Model
BP 600.1 (serv.man4)
Pages
1 Few pages! See other manuals at the bottom of the first or last page.
Size
112.73 KB
Type
PDF
Document
Technical Bulletin
Brand
Device
Car Audio
File
bp-6001-sm4.pdf
Date

Read JBL BP 600.1 (serv.man4) Technical Bulletin online

 
              
Service Bulletin
 
 
 
Service Bulletin JBL2000-04 - November 2000 
 
 
 
Warranty labor rate: MINOR 
 
 To: 
All JBL Service Centers 
 
 Models: BP300.1, BP600.1, BP1200.1 
 
Subject:  Muting during intense bass passages 
 
The  JBL BP series amplifier is designed with the following protection circuits: 
Thermal (excess heat) 
DC voltage on the output terminals (overdriving or “clipping”) 
S
 
hort Circuit (excessive current) 
Under certain large signal conditions during intense bass passages, the unit will go into protection.  These 
amplifiers are behaving as designed.  As the unit is driven into hard clipping, the protection circuit found in BP 
Series amps was engineered to protect your loudspeakers from being destroyed by a severely clipped output 
signal.   This can be remedied easily by turning the volume down somewhat on your music source. 
 
In the event you receive a BP series amplifier with the complaint:  “Under a large signal input, with 
music that is composed of high-level bass, the amplifier mutes for 2-3 seconds, and then returns to 
normal operation”,
 the following modification will effectively increase the amount of clipping that is allowed to 
occur before the protection circuit engages by increasing the threshold at which the amplifier mutes - for the 
benefit of customers who use the amps in SPL competition, or for customers who insist on driving the 
mplifiers into this potentially hazardous zone.  
a
 
1)  Turn the amplifier upside-down and remove the Phillips screws holding the bottom cover on. 
2)  Locate and change R510 from 47K to 4.7K ohms 1/5W (JBL part# RE212047200). 
3)  Locate and change R511 from 22K to 2.2K ohms 1/4W (JBL part# QAF0450-222).   
4)  If it is not already present, add new part - 4.7uf 50v electrolytic capacitor (JLB part# EC070114760) in 
parallel with R511.  Polarity: The negative side of the capacitor must be connected to the junction of 
R510/R511, which can be discovered with an ohmmeter. 
NOTE: Using the correct soldering techniques, you should be able to make these changes from the top of the 
PCB without its removal. 
5
 
)  Replace bottom cover; test amplifier 
 
 
Model Serial 
number  Status 
Action 
BP300.1 
BP600.1 
BP1200.1 
 
All Serial numbers affected 
 
Modify if Needed 
Change R510 from 47K to 4.7K ohms 
Change R511 from 22K to 2.2K ohms 
Add 4.7uf 50v electrolytic cap in parallel with R511 
 
JBL Incorporated                     250 Crossways Park Dr.     Woodbury, New York 11797 (516) 496-3400
 
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Download JBL BP 600.1 (serv.man4) Technical Bulletin

Here you can read online and download JBL BP 600.1 (serv.man4) Technical Bulletin in PDF. BP 600.1 (serv.man4) technical bulletin will guide through the process and help you recover, restore, fix, disassemble and repair JBL BP 600.1 (serv.man4) Car Audio. Information contained in service manuals typically includes schematics / circuit diagrams, wiring diagrams, block diagrams, printed wiring boards, exploded views, parts list, disassembly / assembly, pcb.