Technics SU-A900, Relay nya Bunyi Terus

This Technics SU-A900 amplifier was delivered with a continuous beeping relay, preventing it from functioning properly. Visually, the components that appeared to be burnt (charred and suspected to be problematic) were resistors coded R710 and R715, connected directly to the relay pins. Their resistance value was measured at 325 ohms (it should be 330 ohms). After checking the parts list in the service manual, it turned out that the 330 ohm resistor was for the Mk2, while the original product (the Mk1 being repaired) should only be 150 ohms. After carefully examining the transistors, diodes, capacitors, and resistors, it turned out that only one electrolytic capacitor, the C714 (16V 470uf), had dropped significantly in value. It was replaced with a 25V 470uf Panasonic FC. Previously, this amplifier had been repaired by another technician, as seen from the different solder marks (thicker) and all 2 transistor legs had been re-soldered, indicating that the soldering iron had been removed and measured. In this condition, I myself did the same inspection method and it turned out that almost 13 transistors were not found to be damaged (including the diode and electrolytic capacitor). After feeling that there were no other problematic parts.... Then I reinstalled it, it turned out the problem was still the same 😥 Because the duration of this video is quite long (sorry.... Can't edit videos.... Gaptek 😥😁), so I ended it and continued with the second part of the video, hopefully it can be entertained and useful 🙏