Technics SU-G70 clicks but doesn't display or sound
I turn on the amp (Technics SU-G70) and it clicks as though the power is turned on (and later you're able to return to feel that the amp is warm). However, the display is blank and there is no sound output. In the past, I could just slap the side and it would come on. After hitting it, the amp would either go back to blank after a few moments or it would stay on. It was hit-or-miss, no pun intended. Now, it seems no amount or strength of hitting will get it to come on. Please help. I have my first HDTV coming in a couple of days and I want to have at least something to hook-up. :-) Thanks.
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Mostly this happens when power output is damaged
or the power supply circuit has a problem
the amplifier has a voltage detection when its over or under voltage it wont let the unit to start normally.
Hope this helps.
The clicking sound will be a relay for the protection circuit. That could be faulty, but first check out the main devices on the main amp section. Those attached to the big heat sink. If you see a single IC amp that could well be faulty.
Sir the problem of your unit is the power IC the other channel of this IC is already faulty. unplug the unit to the main AC outlet then remove the cover of your unit you will see a large aluminum plate the power IC is attach to that heat sink in order to fix this you should replace the IC. Or can you give me the part number of the IC so I can determine the pin configuration. Good day and best regards.
I have a technics too, and faced the same problem. The solution is very simple just ensure the +ve and -ve wires are connected correctly for each speaker to the amp. Eg. red wire to the red knob and black wire to the black on both ends. sometimes this arises because the wires are of just one color however there will be some marking on the wire to indicate which is +ve and -ve. This took care of the overload problem.
it doesn't sound like it. but maybe. it would be the input section of your amp that blew if it did go. try replacing your speaker wire first, if that doesn't work then your volume knob(if the volume is analogue) may need to be replaced. if that doesn't work. then you may have blown the amp. what source are you testing with?(cdplayer, dvd player, etc.) and what inputs are you using? (analogue, digital optical, digital coax)
An amp will cut out if the output protection circuit kicks in. This circuit compares output power against the preset level. Each channel has it's own, independent protector. There are calculations that can be done, but for a novice the rule of thumb is to "never use a speaker with a power rating less than the amp AND a lower impedance than stated". Typically using a 4 ohm load on a 8 ohm system is inviting disaster. Even if the system does not become a smoke generator, you might notice that though "louder", the sound quality is deteriorated. Many "audiophiles" often hook up some combinations of speakers to have "surround" without really understanding that the collective impedance actually changes (generally lowers).