Question about Onkyo HTR500 Receiver
Unit works fine but the display is dark
Look on line for service manual. Display problem is usually traced to 1, or more, of 3 resistors in the AC supply to the display. It appears that the resistors are supposed to be 1/2 watt but the one I removed from my unit was only 1/4 watt. The resistors are mounted on a small board mounted on the front side of the main transformer - right most board. I had to unscrew the transformer to access the resistor. I looked at voltages coming out of the transformer and the the same voltages leaving the circuit board. There is a 1 Ohm, a .47 Ohm and another that supply AC voltage to different parts of the display. I found one resistor open. Replaced it and I now have an operating unit.
Posted on Jan 18, 2013
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Posted on Jan 02, 2017
SOURCE: i have a onkyo HT-R500
A receiver that recent usually has a detect circuit that keeps the outputs off until speakers are connected . So, if it bows fuses right away , it's really a power supply issue.
Probably the AC rectifier bridge.
Tech service only.
Posted on Jan 01, 2009
Carl- If you are sending a Line Level Audio signal to your ONKYO RECEVER, from your Sirus RCA cable Output, IE, the CD input, the VCR input, the AUX in, ETC. No Need to have the RECEIVER in the FM mode, you are just needing amplificaton of the sound signal or Sirus signal sound.
Posted on Feb 28, 2009
The burn spot on the display tube is normal.
Check for dc voltage to the display first and last pins should be (-20v to -30vDC) to ground.Then check for ac voltage across the first an last pins of the display should be (3v to 5vAC)
If you are missing them check for open fuses or resistors often on a board on the main transformer. But there are several other possibilities (shorted diode, transistor, capacitor or open resistor).
Only a couple of times have I seen a new display fix it.
Always look for bad solder connections on the display.
As for replacement parts I dont know if they sell to the public or only to service centers.
Posted on Mar 13, 2009
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