Technics amp SU-X999. I need an output I.C type SVI-4004
Technics amp SU-X999. I need an output I.C type number SVI-4004 circuit reference IC501. The I.C is obselete from Technics / Panasonic so if anybody knows anywhere that might still have one in stock I would be pleased to here from you. firstname.lastname@example.org
In the UK I have tried Technics / Panasonic, CHS, SEME, CPC, NIKKO
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Re: Technics amp SU-X999. I need an output I.C type...
NAother option is to fix a universal amplifier kit into the set which powers from the same voltage preferrably a MOSFET drive which are very much available in the market and can be suited into the set. They will alos be very effficient but take care tto do the fixing mechanically , connecct the right power and groung with good shielding. Disconnect the old amp totally and use the power lines that come to the IC. I hope this works for you. Good day
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Technics SuG91 uses a couple of SVI ( I think they are SVI ) packs for driving the speakers. These are big black plastic things mounted to the silver finned heat sinks. 95 % of the time, this is the problem. They are not very tolerant to any type of abuse, and all the amp has to do is overheat once and they are toast. 1 The SVI packs are expensive and that amp may not be worth fixing. If you know how to de-solder something, and are comfortable working with voltages that can kill you, you can unplug the amp, make sure it has been unplugged for at least 20 minutes, and gain access to the area of the circuit board that the SVI packs are soldered to. De-solder one of the packs and remove it from the unit. Make sure that when you de-soldered the SVI pack that you DID NOT accidentally solder one solder hole to another ( create a connection from one hole to another that shouldnt be there ) . Re-assemble the unit correctly, plug it in and turn it on. If the display lights up, you have removed the offending unit and need another one. If it is still in protection, then mark the one you took out as "possibly good", and repeat the removal procedure for the other SVI pack. NOTE if you decide to replace the SVI pack yourself, you will need heat sink compound ( that goo that stuck the original pack to the heat sink ). you will need to remove the old stuff ( a rag and some alcohol will work ) before you apply new heat sink compound. If you are uncomfortable with ANY OF THAT, then take it to a shop that offers free estimates. Good luck and BE CAREFUL....Rob
From your question, I don't know if you're looking for an amp board, or preamp board. These two functions may be covered by multiple boards.In any case, they are no longer available. Your unit would need to be troubleshot by a competent audio tech to the component level. If you need more assistance, or would like to inquire about a repair, please visit my website, audioserviceclinic.com. Thank you.
If these are model numbers,you would need the part number of the IC. If the IC is specific to Technics, it is most likely to be unavailable. If you would like more information, or would like to inquire about a repair, please visit my website at audioserviceclinic.com. You may contact me there. Thank you.
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.
Let's establish which is the IN and which is the OUT here. The PC is a Line Level source so its OUTPUT would feed one of the amp's Line Level INPUTs.
What's the second amp going to do in your scenario? Something other than the normal stereo channels; something multichannel (if your PC supports it); or just more speakers supported for the PC to feed?
An RCA Y-connector pair would share the stereo output of the PC with multiple Line Level destinations.
If a second amp with its own volume control is intended to share the same two channels with the SU-V500 it could also be slaved off the back of the SU-V500 wih an RCA patch pair exiting the Tape 1 or 2 REC(OUT) jacks. The second amp would receive full-volume audio from whatever source the SU-V500 is playing. Just don't activate the selected Tape monitor on the SU-V500 or you will cut off the source to both amps.
Usually this is a defect in the output amp IC. If you have no experience with repairs of these types of units, have it checked by a service shop. If the output AMP IChas failed, it will cost about $75 for a replacement. This unit uses an RSN3306P IC .
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).