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Here is the Amp in all its miniature glory. total size is 91/2 inches X 9 5/8inches and 6 inches deep. All controls are in the front panel.
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Remove the 4 Phillips head screws from the back panel.
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Here are the 4 #6x1" screws
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Remove the back panel. Use a small screwdriver, or other instrument to free it from its recess.
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Work your way all around, since the back is a bit snug in the recess.
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Once the panel is freed from the recess, fold it down and remove from amp.
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Something does not look quite right :-)
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the transformer should be mounted to the PCB, not laying inside the box.
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Trying to find a mount for it.
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Closer view of the control panel PCB.
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Mount for the transformer
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Unoccupied connector
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Fuse
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Before anything else, check the fuse for continuity. this one has failed.
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Replace the fuse. Insert transformer power cable to PCB.
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Since the Amp did not turn on, check the power out on the transformer. It does show 12V DC. Reconnect it and turn the Amp face forward.
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The Amp uses a 6.3mm input and output jack. Apply a sound source to the input. Still no sound from the Amp, it is time to check a bit deeper.
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Remove the two Philips head screws from the carrying handle.
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Those are 3mm x40mm
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Remove the Philips screw on the right side of the Amp
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Remove the Philips head screw on the left side of the Amp.
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Unplug the speaker wires.
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Remove the Philips head screw that holds the power cable bracket.
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Remove the front panel and the attached speaker.
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Simply lift it at an angle out of the back of the Amp.
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The control panel and the attached PCB can now be removed.
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Another odd looking piece is the location of the power Amp IC.
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The smudge marks of the thermal past revealed that the board was loose and the the IC did not make contact with the heatsink
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The thread in the heatsink was partially stripped. Use a small jewelers screwdriver to wedge under the screw,while using a #2 Philips screwdriver to remove it.
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Remove the connector from the PCB.
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Remove the IC PCB from the panel. The IC definitely shows some damage, most likely from overheating.
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Here is a close up of the damaged IC. It is a TDA2030A 18 W hi-fi amplier / 35 W audio driver
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These are the tools needed to replace the IC. 15W Soldering iron, flux and desoldering wick.
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These are the five contacts that need to be desoldered. Apply some flux on the wick and heat up the solder with the soldering iron.
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Remove the damaged IC
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Here is the replacement IC.
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Place the IC properly on the PCB
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Solder it in place.
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Reapply a thin coat of thermal paste to the back of the IC. Use a self tapping screw to attach it to the heatsink.
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Now is also a good time to properly mount the transformer. I used some M3x15mm machine screws.
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With those repairs made, all that is left is to reassemble the AMP. In my case, this Amp worked after replacing the TDA2030A
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Annulation : je n'ai pas terminé ce tutoriel.
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Un commentaire
Good Job! Very detailed, narratives good, and photos were excellent for a learning tool. Matt of Martins TV Repair.