Used Bose 901 speakers with equalizer for over 30 years to provide outstanding sound. The equalizer provided 20db of boost at 35Hz and 15db of boost at 25KHz. Designed and built two 200 watt amps to provide the headroom needed.
Sony A/V System: KDL-55XBR8, BDP-S550 and AVD-LA2500PKG, consisting of AVD-C70ES Super Audio CD/DVD Receiver, 4 SS-LA500ED surround speakers, 1 SS-LAC505ED center channel speaker and 1 SA-WD200 Active Subwoofer
Thanks for the link! I suspect that the DC offset is due to one of the amp power supply rails being higher than the other. That would tug the output toward the higher of the two power supplies. That condition could be caused by aging filter capacitors (one has a lower capacitance than the other).
Very nice looking system! Do you happen to have a link to the TA-E80ES service manual? That would sure help. I suspect that the volume control is multiple potentiometers ganged together. There probably aren't any mechanical adjustments.
All the auto mode does is control the power relay. However, if it did so frequently, that might cause problems. I found the following information posted in the AVS forums: This is usually what needs to be replaced on these subs. Replace R830 R831-4.7 ohm 5% 1/4w fusible C860 - 082 mf 5% 50v Direct from Sony: hxxp://servicesales.sel.sony.com/ecom/accessories/web/index.jsp c860 is Part # 113616400 $2.14 r830 is Part # 121284900 $2.14 I just located those parts in my SA-WX700 service manual. I recognize the components. I believe that they w ..
Do you happen to have a link for the STR-GX50ES service manual? That would help a lot. Since diodes are non-linear devices, I would expect there to be a 240Hz component to the ripple. However, I would expect the amplitude of the 120Hz ripple to be significantly higher. Have you put your scope on the main filter capacitors? If there is a 240Hz component to the ripple, you should be able to sync the scope to it. Better, yet, if your scope includes a spectrum analyzer, try that. Is there a bypass capacitor across the electrolytic main capacitors? Are there diodes or transistors in the bia ..
All I can do is review your logic. Pin 15 is pulled low if Q575 conducts. That stops the VM OUT (whatever that is) from IC301. Q675 conducts unless Q501 is conducting. I think that occurs as long as there is vertical deflection (IC501). OK! Lets look at the logic for comparator IC531. Pin 7 is high if the voltage at pin 5 is greater than the voltage at pin 6. It looks like the voltage at pin 5 is about 5V x 10K/(10K + 3.9K) = 3.6V when IC301 pin 11, EW, is high. Other than that, its probably lower, but we can't determine what it is unless we know the AC output at FBT Pin 11, A ..
What was the SA-WX700 issue? I have the SA-WX700's little brother, the SA-WD200. I have spent many hours trying to figure out why my SA-WD200 doesn't come on. It has nothing to do with the "auto" mode as the power relay energizes normally. I have to crank up the volume with known bass present until I get sound and then turn the volume back down to the normal level. Annoying, but it works. Don't be scared to turn the volume up, just be prepared to turn it back down immediately! Check out this thread to see more about my ..
Welcome to Agoraquest! According to p-126 of the a Operating Instructions, the POWER/STANDBY light flashing green means that the lamp for the light source is ready to turn on. That suggests that there is a problem with the lamp driver (lamp power supply). However, I wouldn't rule out the possibility that the lamp needs to be replaced. Its best to try replacing the lamp before the lamp driver.
If C710 were shorted, the +200V would drop to zero, not 134V. When a capacitor is bad, its capacitance is much lower than it's supposed to be, which makes it more like an open circuit. It would appear that C710 is not the problem. You said the magic words! I am not sure how it shuts down the FBT, but I suspect that it involves deactivating the horizontal output transistor (HOT). If the HOT stops pulsing the pulsing the primary of the FBT (pin 1) to ground, the voltage present would be B+. The horizontal drive (HD) input to the horizontal output tra ..
Sorry, I meant for you to check the voltage at Pin 3 (+B), not Pin 1. You would need a high voltage probe to check the voltage at Pin 1. I don't see how 200V could appear at Pin 4 even momentarily if the FBT were shorted. I would expect the same reading as Pin 3 immediately. The fact that 200V does appear suggests the proper primary winding turns ratios. Is there a capacitor on the C board that could be shorting out the 200V bus? If for some reason the horizontal output circuit stops working, that would explain the absence of voltages.
Thanks for the link! I now have the KV29X5D service manual. Before your first post, I had never seen the acronym EAT before. What does it mean? I suspect that it is another acronym for fly-back transformer (FBT), since the 135V power supply provides B+ to it. I wouldn't suspect IC606, since it is not an MCZ3001D. I would measure the voltage at pin 1 of the EAT (FBT) to be sure that it stays at 134V when the voltage at pin 4 drops from 200V. I see that 200V goes to the C board. Is it possible that something there is loading down th ..
Welcome to Agoraquest! Do you have a link to the service manual? Unfortunately, I don't have access to the KV29X5D service manual, so its difficult for me to help you. However, I can tell you that you are probably correct in concluding that there would be no high voltage if a +200V supply (there may be more than one) is not outputting +200V. A common problem is failure of the MCZ3001D driver chip (18 pins) used in the DC to DC converters. If there is a D board in your set, check it to see if are any MCZ3001Ds on it. If there are, replace ..
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