Dear all,
i need help with a Marantz NR1501 Audio Receiver. The displayed error message was CHK CPU. The analog Audio Part is working, the digital audio part not. The Service Manual says that some voltages on the HDMI Board are not correct. I checked the voltages on the CN1101 connector:
5V to GND -> 4,95V
3V3 to GND -> 12,7V
My question is why do i have 12,7V on the 3V3 Pins? Maybe a shorted Q215 on the Mainboard? What is the function of the Q215 transistor on the Mainboard?
The reading of the output from the both Buck Regulators AOZ1021AI:
IC1007 to GND -> 4,05V
IC1006 to GND -> 0,66V
I am really frustrated. Many thanks for your support. I extracted some pages from the Service Manual. Please let me know if this is not correct then i will delete it.
i need help with a Marantz NR1501 Audio Receiver. The displayed error message was CHK CPU. The analog Audio Part is working, the digital audio part not. The Service Manual says that some voltages on the HDMI Board are not correct. I checked the voltages on the CN1101 connector:
5V to GND -> 4,95V
3V3 to GND -> 12,7V
My question is why do i have 12,7V on the 3V3 Pins? Maybe a shorted Q215 on the Mainboard? What is the function of the Q215 transistor on the Mainboard?
The reading of the output from the both Buck Regulators AOZ1021AI:
IC1007 to GND -> 4,05V
IC1006 to GND -> 0,66V
I am really frustrated. Many thanks for your support. I extracted some pages from the Service Manual. Please let me know if this is not correct then i will delete it.
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