The amplifier Technics SU-V500 in stand-by (led light) make sound "click clack continued" with led operation lighting intermittence (blinking). The su-v500 in On is in normal condition led's (led stand-by off and led operation light). The problem is "RL751" ? I can change this? Excuse for my bad English!!!
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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.
I have the User manual of Technics SU-600 in pdf format. If you can
sent your email address the i will sent you the manual.Its not possible
to sent the manual through this site as it is a pdf file.
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.
Blingking Light usually means that there is DC appearing in output stage and is protecting Connected Speakers.
It can be faulty Output Stage (Bad ICs/Transistors/Resistors/Capacitors) or Faulty Power Supply.
Working on These types of Problem is not user friendly at all.