I have a Technics SU-Z600, 20+ years old. Both it and the original tuner have always worked fine. For the past couple months, the amp tends to cut out after it is on for a short time. Often it will come on again, or not, within an hour or 2. I'm certain it's the amp as it occurs no matter which component is playing. I realize I have gotten my money out of it many times over, but wondering if there is a simple fix that will allow me to keep this piece of my history.
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Re: Amp is cutting out for no apparent reason
The amp will be suffering from dry solder joint. Is very common for this to occur,caused by heat stressed soldering about power components in the output and power regulator stages. This something you could attend to yourself, but only if you have good soldering skills. If not, then it would not be an expensive repair to have a good Tech to repair for you. Best bet is to find a mate to do the work for you if you are not up to soldering. Or get some junk boards, a decent soldering iron(Goot and Weller make some low cost ones that will do) remember that your work will be limited by your tools and skill. Good Luck
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Is there any indicator on or its all off?
anyway i will assume that there is none
1.check power fuse if blown.
2.check power transformer if there is any output voltage
3.check internal fuses
more information will give a better idea.
try these steps and hope this helps.
I have the same TECHNICS SU A900 MKII as you are talking about and it always runs warm I think using 4R speakers instead of 8R speakers should solve the problem and actually I am thinking of switching to 4R as well.
THe amp has detected a problem and shutdown to prevent further damage. This unit has 2 amp pacs inside and one or both have failed. If you can solder, you can fix this yourself. The main amp pac is an SVI3206 and can be purchased online for about $60.
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).
its the ic that controls the + and - voltage and there are capacitors that have leaked all the caps on that board need changing could be expensive and time consuming but its the age of it . if i was going to do that job £200 plus\
i have the same unit and a similar problem, after a fall of the tuner on the floor while i was cleaning my room, first times the st-x302l was powering fine but after some minuts it quit alone.. now (i dont know why) it remains on but if there is an interruption of electricity it dont turn on anymore, it turn on only by removing the metal chassis and moving random the electronics.. i think it has some electronic contact or circuit break.. i brought it to a specialist in electronics and he told me the reparation would be too expensive so i prefer to try fix it by myself.