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I need an schematic of SU-Z250 Technics, it sound moving balance knob from left to right but no sound when an external signal is input(tunner, nor cd )
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I havd the same issue. u need to get a good contact cleaner and spray
the selector rod( remove knob first with preamp facing up), the liguid
will find leak into selector and clean contacts. after doing mine, the slector knob feels more solid when turned and does not change input anymore. Junior
If the same channel is dead on the EQ as is dead on the amp there may be a correlation.
Let's break this into its two parts.
1) SU-Z550: You don't say WHAT source(s) you tried to use on the CD/AUX, TUner and PHONO inputs. The external device itself could be the source of the low volume. Try swapping the Left and Right cables to see if it follows the source channel or stays with the amplifier channel.
Check the controls on the amp to make sure you understand each one's effect on the sound.
"PHONO" is literal and exclusively FOR A TURNTABLE - NOTHING ELSE - EVER.
2) SH-8055: Equalizers don't 'boost' sound, they modify its levels at various frequencies. To do that they should be connected into a Tape loop on your amp. OUTs go to IN's. Then you select the Tape Loop on the amp and that inserts the EQ into the signal path of whatever source you're listening to. It's actions are BEFORE any other amplifier controls such as volume, tone and balance. The EQ itself also has a Tape Loop to replace the one it occupies. Make sure it is not enabled unless you have a Tape Deck on it to use. Choose "SOURCE". The blue LED display is to show you frequencies are present in the program material.
Set all of its lighted band controls at midpoint prior to declaring it defective. EQ is like any spice - a little is good, a lot ruins the recipe.
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 .
You need to determine if the fault is in the pre-amp section or power amp part. Look around for damaged or burnt parts. If you turn up the volume on the left channel and you hear a weak signal then the pre-amp will be OK. If not then start with that section. Remember the right channel will be the same as the left so compare the parts. If it looks odd in the left it might be the faulty part!
You can apply the Buzz test! Being careful not to touch the power supply parts, touch the two channels in various places with a srewdriver. On the right you should get a buzz showing the signal is there, so touch the left in the same place! And so on...PS don't short anything with the screwdriver!
Make sure it is not on mute. Check rear of receiver to make sure AUDIO IN has not become disconnected. Check input selector and verify that it matches the audio source.
check volume balance between right and left-then change inter connection between sound source and amplifier with new cabel(i prefer gold plated type connectors)(see radio shack). after that if the problem excit your fault in output transistors or output stereo ic depend on circuit design.
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