I got a Yamaha HTR-3065 on the bench currently that's got a no power/ no standby issue.When I plug it in it draws 0.01A from the wall, the relay for the ac transformer never clicks, there are no standby lights on the front, and pressing the power button does nothing. The fuse was not blown but upon measuring the voltages on the power low voltage power supply board (labeled operation 3 pg 89 in the schematic) they do not match what the schematic says they should be.
S9 13.7V
Pwr Ry 0V
AC Det 9.1V
Mgnd 0V GND
The two pins on the transformer for the operation 3 board that are marked as 9.1V AC are reading 13.7VAC when I measure it. I measured the voltage at the 9v relay DC pins and they are either 13.7V or 15V, not really sure why there is any fluctation there, but my guess is something to do with the C1501 connected to it since the relay reading is always consistent with the cap reading. Nothing was reading shorted on the operation 3 board, all the resistors were spot on what they should be and when I checked the relay out of circuit with my bench psu it would click at 9v.
On the operation 2 board (pg 89 of the schematic) there are no voltages present except for on IC131(NJM2388F33)
pin 1 13.66V
pin 2 3.26V
Pin 3 0v GND
Pin 4 1.5V
3.3V is present on the capacitors directly connected to the output of IC131 but none of the other voltage regulators fed by the 3.3v output of IC131 have any output. On CB131 only the 3.3v lines have any voltage on them and the voltage is getting from the operation 2 board to the digital board. I have checked all the other IC's and voltage regulators on ope2 out of circuit and they are testing fine they just either aren't being fed an input voltage or are not outputting when they are in circuit.
I did also check everything out with my thermal camera and nothing was heating up at all on any of the boards. I have also checked all the caps in circuit with my esr meter and none of them are reading out of spec. I know that's not the way to test them but nothing jumped out at me as having 20ohm esr's or anything alarming.
Not really sure where to go from here with this one. I'm suspecting something weird is going on on the operation 3 board that's causing an issue on the operation 2 board, but I haven't been able to figure it out yet and after a couple days of messing with it and measuring I figure it's time to ask for some help rather than going any crazier over it.
S9 13.7V
Pwr Ry 0V
AC Det 9.1V
Mgnd 0V GND
The two pins on the transformer for the operation 3 board that are marked as 9.1V AC are reading 13.7VAC when I measure it. I measured the voltage at the 9v relay DC pins and they are either 13.7V or 15V, not really sure why there is any fluctation there, but my guess is something to do with the C1501 connected to it since the relay reading is always consistent with the cap reading. Nothing was reading shorted on the operation 3 board, all the resistors were spot on what they should be and when I checked the relay out of circuit with my bench psu it would click at 9v.
On the operation 2 board (pg 89 of the schematic) there are no voltages present except for on IC131(NJM2388F33)
pin 1 13.66V
pin 2 3.26V
Pin 3 0v GND
Pin 4 1.5V
3.3V is present on the capacitors directly connected to the output of IC131 but none of the other voltage regulators fed by the 3.3v output of IC131 have any output. On CB131 only the 3.3v lines have any voltage on them and the voltage is getting from the operation 2 board to the digital board. I have checked all the other IC's and voltage regulators on ope2 out of circuit and they are testing fine they just either aren't being fed an input voltage or are not outputting when they are in circuit.
I did also check everything out with my thermal camera and nothing was heating up at all on any of the boards. I have also checked all the caps in circuit with my esr meter and none of them are reading out of spec. I know that's not the way to test them but nothing jumped out at me as having 20ohm esr's or anything alarming.
Not really sure where to go from here with this one. I'm suspecting something weird is going on on the operation 3 board that's causing an issue on the operation 2 board, but I haven't been able to figure it out yet and after a couple days of messing with it and measuring I figure it's time to ask for some help rather than going any crazier over it.
