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Post by madmax1964 on Sept 29, 2015 10:30:27 GMT -5
Yes I have a Pioneer VSX 920 Receiver and some time at power- on the right channel very loud noise which is quieter then , now since a few days , when you turn on Poer receiver turns off again and then flash MCACC is on .
Have the receiver screwed times and the transistors desoldered D2390 and B1560 Sanken , receiver went on again and not fashion in Protect , New Original had then ordered transistors , and soldered receiver went back to normal and without error but only 5 hours , the next time again the error MCACC flashes and when "TUNE Down Arrow" and "multi-zone on/off he goes again ---- Rauscht Right channel again and then is silent .
mfg Mad
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Post by mastertech on Sept 29, 2015 14:43:16 GMT -5
I'll be with you in a little bit.
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Post by madmax1964 on Sept 29, 2015 15:01:08 GMT -5
Had everything was by considering the final stage FR notice any deviations ! Also on the motherboard no bloated capacitors !
know at the moment not continue , he went so again , what could it be that when you turn the Front Right Channel sound very Loud Rauscht and then is silent , they have more experience !
I have tested with multimeter , FR speaker terminals on the receiver FR 0.89 Volts DC ------- FL has only 0.65 Volts DC
Service Manual available for VSX 920/1020
mfg Mad
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Post by mastertech on Sept 29, 2015 15:16:27 GMT -5
Your translator is not doing very well. Try sending your above post in your language and I will see if it translates better from here.
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Post by madmax1964 on Sept 29, 2015 15:20:38 GMT -5
Ok im Coming from Germany !
best Regards
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Post by madmax1964 on Sept 29, 2015 15:33:13 GMT -5
Seit meheren Moinaten habe ich beim Eischalten von meinem Receiver Pioneer VSX 920 folgendes problem --Receiver geht an es kommt Power on im Display --- Receiver geht wieder aus ---geht wieder an und auf dem FR Kanal Lautes rauschen ,was dann leiser wird und der Receiver funkioniert Normal.
Jetzt aber wollte ich ihn einschalten und es kommt Power On im Display und der Recever geht aus und Die Rote MCAACC Led blinkt.
Ich habe hier im Forum viel mitgelesen und auch andere Treads beobachtet VSX 1020 etc. und bin dann auf die Idee gekommen mal die Endstufen Transistoren für FR aus zu Löten ,dann Funktioniert der Receiver wieder normal , habe mir darauf hinn die Sanken 1560 und 2360 Neu gekauft und Eingelötet ,er ging wieder ohne Probleme hatte Spass,aber nur 5 Stunden dann hatte ich ihn ausgeschaltet.
Habe mal am Receiver am Lautsprecher anschluss mit Multimeter Nachgemessen FR DC 0,89 Volt
FL DC 0,65 Volt
Am Nächsten Tag war wieder das gleiche Receiver an -- aus -- dann MCACC Led blinkt.
mfg MadMax
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Post by madmax1964 on Sept 29, 2015 15:47:29 GMT -5
Since meheren months I have with the Power On of my Receiver Pioneer VSX 920 the following problem - Receiver goes to it power on comes in the display---Receiver goes again from---it begins again and on the FR of canal of sound rush what becomes quieter then and the Receiver funkioniert Normally.
Now, however, I wanted to switch on him and power On comes in the display and the Recever goes out and The red Pqls Led flashes.
I have coread here in the forum a lot and also other Treads observed VSX 1020 etc. and then am over had the idea sometimes the output stages transistors for FR to soldering, then functioned of the Receiver again normally, has anew shopped to me on it hinn the Transistor in 1560 and 2360 and Has soldered, he went again without problems fun had, but then I had switched off only 5 hours him.
If Connection with multimetre has checked sometimes in the Receiver in the loudspeaker FR of DC 0. 89 volt
FL DC 0. 65 volt
On the Next day the same Receiver was over again in - - then MCACC Led flashes.
rgds MadMax
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Post by mastertech on Sept 29, 2015 20:10:20 GMT -5
Well that did not help very much. So i guess I will have to make some assumptions as to what you are saying. Hopefully we won't make any major mistakes. First off, here is the service manual: 1drv.ms/1ReOPNnWith the MCACC blinking it means there is a problem with the amp section. I think from what you are saying is that you had found a problem with the FR output transistors, Q1201FR and Q1202FR and replaced them and it worked for a little while. The problem is, if there was a problem with these 2 outputs then there were most likely other parts in that circuit that were damaged. So you will have to hunt around that section looking for other damaged parts. You will also have to recheck the parts that you replaced. Also, I am not sure of what you are saying but it also appears like you may have some DC on the FL output. If you actually do then that will also have to be looked into. I fear that the language barrier may make it difficult to diagnosis. |
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Post by madmax1964 on Sept 30, 2015 13:28:12 GMT -5
Then best thanks to first for her efforts,
will check first the Wiederstände in the Amp section FR
4 P0. 47W-1BK ND RES 0. 47 OHM 1 W 5% AXIALLY
4 ND RES 0. 47 OHM 1/2 W 5% AXIALLY
2 100DSCT-ND RES 100 OHM 1/4 W 5% AXIALLY
will check these parts first like in the VSX 1022 Thread
announce me then later again!
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Post by madmax1964 on Sept 30, 2015 14:11:04 GMT -5
Has connected the Receiver to the Stream Net just over again, 3 days were separated from the net. And he funktion is Normaly on FR of no rushing nothing and MCACC is not in the blinking. If it can be, nevertheless, a problem with the Standby Transformer exists his longer connected  ? I do not believe in miracle healing ! |
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Post by mastertech on Sept 30, 2015 18:36:06 GMT -5
My guess would be a possible bad solder connection somewhere.
Did you check for any DC voltage on the speaker outputs since it is working?
I would also suggest a master reset. Sometimes an extreme setting in a menu item can cause shut down.
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Post by madmax1964 on Oct 2, 2015 16:20:31 GMT -5
If everything has paced yesterday over again and found an opposition R 1207 C060012263050-IL
Front Right Channel of the divergences has ohm in 1024 and on the other channels this Resitor has 1170 Ohm.
Does find no data about the opposition R 1207 this Part Number is C060012263050-IL would become him erstzen?
Resitor R 1207
Ohm ?
Watt ?
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Post by madmax1964 on Oct 14, 2015 12:27:53 GMT -5
If the problem has solved now, it was the driver Transistor 2SC in 2240 NPN 120 V 0. 05 A TO-92
and the opposition Resitor 1,2 kohm 1/4 watts.
If plays again how on the first day, no MCACC flash Led blinks and no rushing more.
I am a happy
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Post by mastertech on Oct 15, 2015 8:59:23 GMT -5
Good job. What was the location id of that transistor and resistor?
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