Yamaha RX-V473 5.1 Channel Network AV Receiver - Page 8 - Answered Questions & Fixed issues
I have a wonderful old Yamaha M-40 Stereo Power Amp. It has a thump-prevention speaker protection circuit that does NOT kick off and engage the speakers...
Hi there. More than likely the power output stage has a problem (possible if the amp was on at the time of the surge). It would be best to have a proper component tester to check the stage components but component testers are expensive. But the good thing is that you have an other working amp. Since you don't have the knowledge or proper equipment I would suggest to open up both amps and compare the readings of the same points of each amp. A shorted or cut-off power semiconductor would show even on a multi-tester set at the diode scale. Check also ALL the fuses and fuse resistors related to the output stage (resistors under 1? (brown black black 1? or gold brown black 0.1?) .
2/24/2019 9:05:30 AM •
Yamaha Audio...
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Answered
on Feb 24, 2019
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318 views
My yamaha RX-v1600 receiver volume not will only mute or play at one volume. I tried cleaning the mechanism but it did not help. Is there some wrong with the board.
Sometimes cleaning the potensiometer (mechanism as you described it) and lubricating them with electric contact spray does not fix the issue. Although if you havent done so, please purchase a good potensiometer/contact cleaner from an electronics retailer, take the cover off your amp and after blowing off ALL the dust that may have been accumulatet inside the amp, spray a bit of cleaner in the volume potensiometer from the terminal opening or any hole on the body. If it is of the sealed type then it has to be replaced.
Please test the terminals of the potensiometer where they connect to the pcb with a component tester or if not available with a multi-tester set at ? 's (any scale that would give a reasonable indication when the potensiometer is set at the middle position). Test between one of the end terminals and the middle one. Indications should change logarithmically while you turn the knob slowly. If you get a sudden over range indication then that potensiometer is damaged and needs replacing.
2/24/2019 8:45:01 AM •
Yamaha Audio...
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Answered
on Feb 24, 2019
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170 views
Yamaha amplifier rx-v457 auto shot down.?
If the auto shut down is activated the moment the amplifier is turned on then there must be a problem with the output. Please check the speaker cables visually for short circuit. You can also use a multi-tester set at 20 ohms scale. Unplug the all the speaker cables from the amplifier and test at the cable terminals. You should get a reading anywhere between 4 and 10 ohms at each terminal.
If the speaker.cables are fine then the one of the power outputs of the amplifier (front or central or surround) must be damaged.
If the shut-down occurs while playing music for some time, you may have to remove the cover of the amplifier and check for dust accumulated on the heat sinks of the power output stages (aluminium plates with fins). Blow the dust off the sinks and the rest of the circuits.
2/24/2019 7:55:51 AM •
Yamaha Audio...
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Answered
on Feb 24, 2019
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131 views
Yamaha htr 5740 reciever i turn it on and it sounds like it powers up cause it clicks on but no display in the front panel
“it sounds like it powers up cause it clicks on but no display in the front panel” NO,it does not sound like power up due to "no display in the front panel" The relay controlling AC line power connected to LARGE POWER TRANSFORMER DOES NOT switch ON with the exception of voltage for FL tube(front panel) is down.Check standby board (AC inlet board) that is its reset signal and AC_PWR_DET are of paramount important. REMEMBER TO CHECK THOSE NON POLAR CBB Capacitors (their capacitances.)
2/9/2019 5:21:15 AM •
Yamaha Audio...
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Answered
on Feb 09, 2019
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141 views
I have a Yamaha yst-sw012 that wont turn on
Download YST-SW012 SERVICE MANUAL.Make sure transformer is good . Check +B AND -B voltage if they are correct.Black probe connects to ground (GND) and red probeto +B AND -B. If protection, replace the power amp IC, diode and Capacitors.
1/15/2019 6:51:00 AM •
Yamaha Audio...
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Answered
on Jan 15, 2019
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478 views
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