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Post by mastertech on Nov 29, 2014 16:06:30 GMT -5
I would put all the parts back in that you removed, except for that relay of course, and make sure it works. If it does work ok, at that point you can decide to either replace the relay or leave it like it is.
No, the relay should not make noise when you shake it. It is most likely shorted. That is why the fuses were blowing. The low tap was shorted to the high tap, most likely.
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Post by jeremy on Nov 29, 2014 16:09:43 GMT -5
Makes sense, I've pulled relays before and not heard them make noise. For what its worth I already put all the parts back in before removing the Relay, so everything was running when I turned it on.
What is the relay for? And also, may sound stupid of me to ask, but what are the extra pins for that I'm not using anymore with the "mod" that you had me do?
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Post by mastertech on Nov 29, 2014 16:20:56 GMT -5
The relay would switch between the low tap and high tap of the main transformer. This would change the drive voltage of the amp. In an amp with a 4/8 ohm selector this change in voltage is what would allow the use of 4 ohm speakers without overloading the amp. Since you do not have a selection of such the receiver software switches the voltage for what ever reason it was programmed to in the software. Maybe it can auto sense the load? Maybe it is when also running front high speakers? I do not know. But if it puts out adequate sound and volume on the low tap, which is what the jumpers are doing, then you can just leave it like it is and it will work just fine. Otherwise you can replace the relay but you would then need to verify that the relay control circuit was not damaged from the failed relay.
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Post by mastertech on Nov 29, 2014 16:22:24 GMT -5
Also make sure you check for any DC on the speaker terminals before you connect any speakers.
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Post by jeremy on Nov 29, 2014 17:25:42 GMT -5
Ok there's no DC on the outputs, I hooked up the front R & L, threw a FM signal on, but no speaker output, so I checked those 2 Fuses again, and they blew.... with the relay out, along with those blowing again, explains why it would stay on as well... :\
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Post by jeremy on Nov 29, 2014 17:54:02 GMT -5
Ok I put new fuses in (different type, I was using Pico fuses instead of the actual type that came out of the receiver) I put original ones from a donor unit in and they don't blow anymore, but the receiver goes into protection
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Post by mastertech on Nov 29, 2014 19:11:00 GMT -5
I've been looking over the protect circuit to see the best and shortest way to try to find this. So here is what I got.
Go to the digital board near the main control ic2105. Look for pin 87 and just off of there should be resistor R2953. Removing that should disable the protection. Now go to the main board. Use a speaker neg for ground probe. Click it in place if you can. Set DMM to DC voltage. Turn on receiver. It should stay on.
Test both sides of these components and give me results:
R678____ ____
R728____ ____
R628____ ____
R550____ ____
R828____ ____
R878____ ____
R778____ ____
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Post by jeremy on Dec 5, 2014 10:53:25 GMT -5
Ok, I know its been a few days, but I finally have those readings. All but one read normal (from power on they would go into the couple hundred millivolt range then drop down)
R728 reads 20vdc both sides from power on and does not drop down. The rest don't even get past half a volt and drop down again on both sides.
I didn't have to remove R2953 as the receiver stays on long enough before going into "protect"
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Post by mastertech on Dec 5, 2014 18:36:11 GMT -5
You need to test components in that circuit. Do you have the print?
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Post by jeremy on Dec 5, 2014 19:01:17 GMT -5
Yep I have the service manual/schematic for it
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Post by jeremy on Dec 15, 2014 10:57:53 GMT -5
Ok, I didn't want to post back until I found something... Well it's been 10 days and I have had no luck finding anything at all. I'm pretty sure though, that its due to my lack of schematic reading skills. I cannot for the life of me find anything bad in this damn stereo.
So... In admittance to defeat, I have to ask you where I should begin MT, I am not letting this simple issue beat me, lol.
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Post by mastertech on Dec 15, 2014 12:54:54 GMT -5
Ok. First remove Q703 and Q704 and see if receiver stays on.
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Post by jeremy on Dec 16, 2014 11:27:58 GMT -5
Will do MT  |
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Post by jeremy on Dec 16, 2014 14:22:08 GMT -5
Removed both the outputs (Q703 Q704), receiver still goes into protect mode
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Post by mastertech on Dec 16, 2014 15:06:27 GMT -5
See if you still have the 20v on R728.
If yes then remove the emitter resistor R713 and try again.
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