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This is a high quality manual with clear schematic and components layout diagrams ; with service procedure included.
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This service manual for the Kenwood KT-990D was reproduced really well ,is very legible and manual is complete.Combined with the low price paid,in the future,I will be checking Owner-Manuals.com any time I need a manual.
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When I purchased this manual I had my doubts regarding the quality as the price was so reasonable as compared to other outlets.
The manual itself is of high standard the print is very clear as are the diagrams. Obviously with the diagrams one has to zoom in otherwise it is to small to be able to read.
Overall I am very pleased with the company who delivered as they said and with the manual they supplied.
I occasionally require a manual and now having registered with this company I shall order from them in the future.
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I was at first dubious about payiong for downloaded manuals but having done so, I was extremely impressed with quality of the two manual I ordered, well worth the small price I paid.
I would highly recommend these to my friends.
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reasonable price for the schematic - the service is perfect, all as expected and pointed by instructions - good scan of the original plans - thank you!
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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