Post by themorgy on Mar 6, 2021 10:28:07 GMT -5
Hi guys
So I have this Onkyo TX-NR609 which won't start anymore.
Plugging it into the power supply, a relais clicking in ~1Hz frequency from the back of the case, so I did some research and found out that the power relais for the transformator is likely to fail, so I bridged the relais output.
Sadly this didnt help, the relais still clicking. Checking the power button resulted 3,3V, and all the fuses are fine. I also removed the old relais and replaced it with a 12V car relais, but same outcoming.
Removing the relais again, bridging the outputs and plugging in, but the receiver still won't start.
I can measure a pulsing voltage of 1-11V along the relais.
The relais coil is ~480Ohms, and R921 is also fine at 46Ohm.
So I tried to check the relais again with 9V battery, working fine, I reattached it and rebuild the amp.
So I went to check the 5 line cable from the mainboard to the relais board. Connection is fine, also Pin 3 GND is connected well to the chassis.
Plugging the amp into power, I measured the pins of the 5 line cable.
1. POWERD pulsing 0-11V (this one triggers the relais)
2. +10VS pulsing 9-11V
3 GND connected to chassis
4. +12VD_ST pulsing 9-11V
5 pulsing 3.3-5V
Q181 is soldered well, also the 5 line cable did well for checking for resistance.
Q181 is well connected to GND, so I checked the base pin, it is pulsing 0-3,3V.
Measuring R692 resulted 219Ohms (measured between base of the transistor and R691).
Checking Pin 126 (measured at R691) is also pulsing 3,3V so I checked the supply of Q701 on easy-to-reach C505, and this is constant 3,3V.
So if I get this right, Q701 has nice and constant 3,3V, but somehow triggers Q181 and the relais by slow frequency.
Can this be a faulty EEPROM?
Or much more likely defect X501 (quartz) ?
Also. while trying to reach the relais, I removed the transformator and a white plastic washer fell out, where did it came from?
Thanks in advance
So I have this Onkyo TX-NR609 which won't start anymore.
Plugging it into the power supply, a relais clicking in ~1Hz frequency from the back of the case, so I did some research and found out that the power relais for the transformator is likely to fail, so I bridged the relais output.
Sadly this didnt help, the relais still clicking. Checking the power button resulted 3,3V, and all the fuses are fine. I also removed the old relais and replaced it with a 12V car relais, but same outcoming.
Removing the relais again, bridging the outputs and plugging in, but the receiver still won't start.
I can measure a pulsing voltage of 1-11V along the relais.
The relais coil is ~480Ohms, and R921 is also fine at 46Ohm.
So I tried to check the relais again with 9V battery, working fine, I reattached it and rebuild the amp.
So I went to check the 5 line cable from the mainboard to the relais board. Connection is fine, also Pin 3 GND is connected well to the chassis.
Plugging the amp into power, I measured the pins of the 5 line cable.
1. POWERD pulsing 0-11V (this one triggers the relais)
2. +10VS pulsing 9-11V
3 GND connected to chassis
4. +12VD_ST pulsing 9-11V
5 pulsing 3.3-5V
Q181 is soldered well, also the 5 line cable did well for checking for resistance.
Q181 is well connected to GND, so I checked the base pin, it is pulsing 0-3,3V.
Measuring R692 resulted 219Ohms (measured between base of the transistor and R691).
Checking Pin 126 (measured at R691) is also pulsing 3,3V so I checked the supply of Q701 on easy-to-reach C505, and this is constant 3,3V.
So if I get this right, Q701 has nice and constant 3,3V, but somehow triggers Q181 and the relais by slow frequency.
Can this be a faulty EEPROM?
Or much more likely defect X501 (quartz) ?
Also. while trying to reach the relais, I removed the transformator and a white plastic washer fell out, where did it came from?
Thanks in advance
