micle
Junior Member
Posts: 57
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Post by micle on Feb 2, 2022 17:23:18 GMT -5
Without R3232 pin 72 0V, but it always remains frozen as before.
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Post by mastertech on Feb 2, 2022 17:31:41 GMT -5
Ok, then I guess you can put everything back in place and remove your cellophane and connect everything.
If I get a chance I will see if i can test the ACDET line in one of my receivers to see what it reads.
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Post by mastertech on Feb 2, 2022 21:33:48 GMT -5
Not sure when I will be able to get you that reading on the ACWP5 line but in the mean time you can check something on your receiver.
For this test you do not have to turn the receiver on, just have it plugged in. Go to the main board at CN55 and put negative probe on pin 3 and positive probe on pin 2 with meter on DC voltage and see if you still have around 2v. Then disconnect the harness from CN55 and redo the test on the connector on the board, same pins and see if the voltage changes.
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micle
Junior Member
Posts: 57
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Post by micle on Feb 3, 2022 14:49:14 GMT -5
CN55 connected, pin 2= 2.05V.
CN55 disconnected, Powered ALL blocked (no clik), pin 2 voltage remains 2.04V.
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Post by mastertech on Feb 3, 2022 15:35:38 GMT -5
Ok, good. Let me see if in a little while I can check that voltage here.
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Post by mastertech on Feb 3, 2022 18:20:55 GMT -5
Ok, I just checked the ACWP line on a Pioneer I have here that has pretty much the same circuit and it is about 2.1v so it looks the same as your test so that is probably not the problem. And ic3004 seems to be functioning and no indications of errors on it. So we are back to square 1. Problem is somewhere that is not throwing an error.
I remembered early on that you asked about the x12verr line and it being only 3.3v so I went back and looked at that schematic again. It traces back from ic800 to the main board and disappears. I have not been able to find where the trigger circuit is. So I cannot calculate whether AB21 on ic800 should be high or low for protection. It is high now according to your test. Maybe it should be low. I do not know without looking at the correct circuit.
If you want to try something you can take that line low by removing R882 which is probably near ic800. That will take the line low and you can see if the receiver starts up normal or not.
Otherwise you just have to hunt around for the problem. Could just be a lost voltage some where, even a small voltage on a critical circuit.
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micle
Junior Member
Posts: 57
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Post by micle on Feb 4, 2022 13:16:55 GMT -5
I have seen the main assy well, many components indicated in the pcb diagram are absent in the assy of the vsx 920 receiver (I can send you the file with the correction if you are interested), in fact the X12VERR circuit is interrupted (Q5951 is missing), so it makes sense which has 3.3V as indicated in the D-MAIN ASSY diagram (1/12).
The problem is elsewhere.
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micle
Junior Member
Posts: 57
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Post by micle on Feb 4, 2022 13:35:08 GMT -5
During the DSP test, step 3: X'tal, IC361 (Pins 1, 3, 5, 13) I can't measure the frequency because I don't have an oscilloscope, but all the pins measure 1.74V in DC, while in AC they measure 0V .
Pins (2, 4, 6, 12) measure 1.45V in DC and 0V in AC.
Pin 14 measures 3.3V.
But should the frequency have only AC voltage?
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Post by mastertech on Feb 4, 2022 14:24:31 GMT -5
During the DSP test, step 3: X'tal, IC361 (Pins 1, 3, 5, 13) I can't measure the frequency because I don't have an oscilloscope, but all the pins measure 1.74V in DC, while in AC they measure 0V . Pins (2, 4, 6, 12) measure 1.45V in DC and 0V in AC. Pin 14 measures 3.3V. But should the frequency have only AC voltage? Quote: "A quartz crystal is used in an oscillator circuit. The oscillator will be powered by DC, but generates an AC signal. The frequency of the generated signal will be determined by the characteristics of the crystal." |
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Post by mastertech on Feb 4, 2022 14:27:10 GMT -5
Have you tried a Master Reset?
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micle
Junior Member
Posts: 57
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Post by micle on Feb 4, 2022 14:36:44 GMT -5
no
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micle
Junior Member
Posts: 57
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Post by micle on Feb 5, 2022 3:32:29 GMT -5
Hi, how do you do the master reset?
Can you please check the -VF line (CN55 pin6) and see if your Pioneer has -28V too?
When flat CN1405 is disconnected, the receiver goes into standby as it should and pin 6 is about 2V.
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Post by mastertech on Feb 5, 2022 12:21:33 GMT -5
Master reset or factory default is on page 25 of the operator instructions manual for the 1020.
-28v is about right for the fluorescent display. And it seems to be working.
My manual shows pin 6 of CN1405 as GNDU. Perhaps you mean a different pin?
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micle
Junior Member
Posts: 57
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Post by micle on Feb 5, 2022 15:11:24 GMT -5
In my VSX 1020 (RRV4045) instructions on page 25 there is the DIAGNOSIS FLOWCHART.
However from standby if I press “MULTI-ZONE ON / OFF” it turns on and freezes (like Standby key), any button I press together at the same time (like “TUNE ↓” or “ENTER”) doesn't change anything.
Yes, I meant pin 6 always of the CN55 connection.
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Post by mastertech on Feb 5, 2022 15:16:15 GMT -5
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