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Electronics Repair (sci.electronics.repair) Discussion of repairing electronic equipment. Topics include requests for assistance, where to obtain servicing information and parts, techniques for diagnosis and repair, and annecdotes about success, failures and problems. |
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Nakamichi Radio Repair
Hi,
I have a Nakamichi Table Radio, Model TM-1. Sleek, black, with bright green read-out. Purchased at Tweeter over 10 years ago. Problem: Pluged into the A/C, it immediately starts low level buzzing sound through the speaker. The radio is not even turned on yet. The On/Off button is a PRESS_DOWN button on top of the uradio. Its not an on/off volume control knob, which exists on many radios. Pressing the ON/OFF button changes nothing, regards the buzzing. None of the controls seem to do anything different. There is a volume, Bass, and Treble control on the side. Turning any of those knobs does nothing different. It just keeps that low buzz buzzine sound. I am not very knowledgeable about repairing electronics. I did open the unit and inspected it. It opens in two halves. There are three cables that join the two halves. They are easily detatched (nice design). One side contains the circuit board with the A/C transformer bolted to it. The other half contains the led unit and the ON/OFF, plus other controls, switches, volume, bass, trebble, etc. I took apart the module on top where you press down on the on/off buttin, and checked that the on/off detent works (actually does press down and makes contact) when you press down on the top Power on/off button. Where do I go next? Pat |
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Nakamichi Radio Repair
When you are inexperienced with electronics I fear my hint won't help much,
but anyway: A constant humming doesn't really need to come from the electronics itself, but could be very well induced from the transformer. The other spot to start is the capacitors in the powersupply, usually quite large ones. When the unit humms / buzzes , it is quite often that these lost a part of their capacity, thus letting low frequencies pass they should have absorbed usually. So step one is to replace them. Usually choosing cap's one scale larger doesn't hurt. Pat wrote: Hi, I have a Nakamichi Table Radio, Model TM-1. Sleek, black, with bright green read-out. Purchased at Tweeter over 10 years ago. Problem: Pluged into the A/C, it immediately starts low level buzzing sound through the speaker. The radio is not even turned on yet. The On/Off button is a PRESS_DOWN button on top of the uradio. Its not an on/off volume control knob, which exists on many radios. Pressing the ON/OFF button changes nothing, regards the buzzing. None of the controls seem to do anything different. There is a volume, Bass, and Treble control on the side. Turning any of those knobs does nothing different. It just keeps that low buzz buzzine sound. I am not very knowledgeable about repairing electronics. I did open the unit and inspected it. It opens in two halves. There are three cables that join the two halves. They are easily detatched (nice design). One side contains the circuit board with the A/C transformer bolted to it. The other half contains the led unit and the ON/OFF, plus other controls, switches, volume, bass, trebble, etc. I took apart the module on top where you press down on the on/off buttin, and checked that the on/off detent works (actually does press down and makes contact) when you press down on the top Power on/off button. Where do I go next? Pat -- Sincerely Aries Quitex http://aries.eu.cx http://wanted.freesubs.de Advanced Architecture - OS3.9 & GeForceIV =) |
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