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Quick service response. A useful and very rare service manual with all details. I recomend this service.
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I ordered this manual sometime in the afternoon and I received it on my e-mail the same evening.
This is a fantastically good and properly scanned copy of the original manual. All pages are of the same scale and they overlap each other. It means that you can print the manual and easily make it as a convenient paper manual.
The content of the manual is fantastic. Alignment descriptions, PCB layouts and elementary diagrams are explicit and precise. I immediately found what I was looking for. Thanks to this manual and Owner-Manuals.com my amplifier is alive again. Many thanx indded!
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The manual was well-scanned and easy to read. As an added bonus, the Operator's Manual was bundled with the Service Manual!
I'd definitely use owner-manuals.com again.
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Finally, i found one website, where i can download this service manual , and fix my hifi. The service manual is very good, and easy to download and to print.
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Complete and very useful. Could have benefited from a little higher resolution on the schematic and layout diagrams for improved legibility.
Service Bulletin
Service Bulletin JBL2000-04 - November 2000 To: All JBL Service Centers Warranty labor rate: MINOR 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�) Short 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 amplifiers into this potentially hazardous zone. 1) 2) 3) 4) Turn the amplifier upside-down and remove the Phillips screws holding the bottom cover on. Locate and change R510 from 47K to 4.7K ohms 1/5W (JBL part# RE212047200). Locate and change R511 from 22K to 2.2K ohms 1/4W (JBL part# QAF0450-222). 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
BP300.1 BP600.1 BP1200.1
Serial number
All Serial numbers affected
Status
Modify if Needed
Action
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
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