Question about Blaupunkt Woodstock DAB 52 CD Player
I have had the DAB 52 working perfectly ok in an06 registered Leyland DAF truck. I now have an 08 registered Leyland DAF which came fitted with a Blaupunkt TRD 47. But when swap TRD 47 for the Woodstock it powers up Ok but I have no audio. I know that the Woodstock is ok as have tried it back in the old truck. In both Trucks I use the fitted ISO plugs neither of which have been changed in any way. Any help gratefully received
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Posted on Jan 02, 2017
There are many different ways that an amp can fail but the two most common failures are shorted output transistors and blown power supply transistors (< those are not blown). There are several types of protection circuits in amplifiers. The most common are over-current and thermal. The over-current protection is supposed to protect the output transistors. Sometimes it doesn't work well enough to prevent the failure of the output transistors but it will work well enough to shut the supply down before the power supply FETs are destroyed. If the amp remains in protect mode, goes into protect mode or blows the fuse as soon as the remote voltage is applied, shorted output transistors are almost certainly the cause. If the fuse protecting the amp is too large, if the protection circuit doesn't respond quickly enough or if the power supply is poorly designed, the power supply transistors may fail. If you see a lot of black soot on the power supply transistors (near the power transformer), the power supply transistors have failed. Soot on the board doesn't necessarily mean the transistors have failed. Sometimes, technicians don't clean up the mess from a previous failure. Transistor Failure/Checking Transistors:
In general, when a transistor fails, it will either short (common for output AND power supply transistors) or open (common for power supply transistors). Transistors act like valves. They control the current flowing through a circuit. A shorted transistor acts like a valve that's stuck open (passing too much current). In the case of an output transistor, the shorted transistors tries to deliver the full rail voltage to the speaker output terminal. If you've ever seen a damaged amp that pushed or pulled the speaker cone to its limits when the amp powered up (common on some Rockford amplifiers), that was almost certainly due to a shorted output transistor. When checking transistors, you most commonly look for shorted connections inside the transistor. You do this by using a multimeter to look for low resistance connections between the transistor's terminals.
Posted on Dec 31, 2008
SOURCE: car audio code
Need to contact previous/original vehicle owner who should have the security code recorded (or local distributor or car manufacturer with VIN number of your vehicle) - code is the biggest deterrant to would be thiefs
Posted on Jun 26, 2009
The instructions should be one of these
Posted on Oct 16, 2009
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