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Post by mastertech on Jan 27, 2022 19:52:43 GMT -5
Ok, lets start with that posistor since it has some reaction. I did not see any info on it in the manual.
Does it have any numbers or stripes on it?
Disconnect it and try turning on the receiver normal.
Do a resistance test on it.
With the posistor still disconnected, get me the voltage reading on all pins of CN55 using pin 3 for your ground probe. Do this first just plugging it in and then again when you try turning it on.
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micle
Junior Member
Posts: 57
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Post by micle on Jan 28, 2022 16:47:14 GMT -5
Posistor pioneer F320121021240-IL, heating it with the hairdryer increases the resistance (Ambient Temp = 265 ohm), during the tests I have always replaced it with a potentiometer (variable resistance).
CN55 test in VDC OFF, ON (with or without posistor, nothing changes):
pin 1 = 0, 4.74
pin 2 = 2.06, 2.06
pin 4 = 5.62, 5.63
pin 5 = 0.004, 3.12
pin 6 = variable, -27.9
In the first part, when I disconnected the posistor, the blue led turned on, when I reconnected it, everything stopped with no signal.
Resistance in the circuit without the posistor, pin 3-5 = 19.2 Ohm
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Post by mastertech on Jan 28, 2022 17:26:02 GMT -5
And when you turn it on what is the condition of the receiver?
Does main relay latch closed?
Do the speaker relays close?
Is the display on?
Any lights lit up?
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micle
Junior Member
Posts: 57
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Post by micle on Jan 28, 2022 19:24:06 GMT -5
The conditions have remained the same, the blue LED flashes, after 1 minute I can turn it on (one click) and the "POWER ON" display but after a few seconds it turns off (one click) and the blue LED flashes.
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Post by mastertech on Jan 28, 2022 19:42:09 GMT -5
The conditions have remained the same, the blue LED flashes, after 1 minute I can turn it on (one click) and the "POWER ON" display but after a few seconds it turns off (one click) and the blue LED flashes. Which blue led? MCACC? |
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micle
Junior Member
Posts: 57
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Post by micle on Jan 29, 2022 4:33:47 GMT -5
Central blue led, next to no name.
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Post by mastertech on Jan 29, 2022 10:56:05 GMT -5
Ok, good. I was hoping that led was the one blinking.
So what I need you to do now is jump the 2 pins together on the 2 pin connector on the main board where you removed the posistor harness connector (CP107).
You could cut the posistor harness and just twist the 2 wires together unless you don't want to cut it. Otherwise figure out a way to connect them.
Try turning on receiver as normal.
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micle
Junior Member
Posts: 57
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Post by micle on Jan 29, 2022 12:03:07 GMT -5
I connected 2 other wires, now after a click it remains frozen "POWER ON", when I disconnect the two wires the blue LED returns with a click.
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micle
Junior Member
Posts: 57
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Post by micle on Jan 29, 2022 12:40:40 GMT -5
IC1501 all pins with voltage 3.3 and 1.2 are correct (also pin 135 which I had confused with 136).
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Post by mastertech on Jan 29, 2022 13:23:42 GMT -5
Ok, let me fill you in on what is bugging me and why I am stuck here on this circuit for now.
With the posistor disconnected and the unit shutting down and the center blue led blinking is just what it should do. But, grounding the temp line looks like it should bring it to normal condition, which it is not. But then you might think that maybe there needs to be some resistance on that temp line for normal condition. Or maybe something else is causing the problem.
But then I look at your test results on CN55, pin 5 ("pin 5 = 0.004, 3.12"). According to the schematics it should be powered in standby also but you are not. So I think this needs to be looked at further to rule it out completely before looking some where else.
I would suggest going to the front display board and finding resistors R3232 and R3023 and testing voltage on both sides of each, both in standby and turned on. Hopefully you can test these with the unit powered.
You are welcome to ask me any questions along the way to help your understanding of what we are doing.
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micle
Junior Member
Posts: 57
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Post by micle on Jan 29, 2022 17:15:09 GMT -5
Interesting test.
Schematic: pin1 --- R3232 --- pin2 --- R3023 --- pin3
VDC with posistor connected (OFF / ON):
pin1 = 0.003, ~ 1.5 (trip relay)
pin2 = 0.003, ~ 1.5 (trip relay)
pin3 = 4.84, 4.88
Then I tried the same test without posistor and when the relay tripped I went back exactly like the first part:
I insert the plug, the receiver clicks and stops without any light signal; I can turn it on (with "POWER ON" indication) and turn it off only if I press Standby for 10 seconds.
Now the central blue led no longer lights up.
However, the test was identical to the previous one.
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Post by mastertech on Jan 29, 2022 17:28:44 GMT -5
Ok, I need you to clarify.
First, I am only interested in voltages with the posistor removed. Just voltages, no other info.
Give me the exact voltages on these 2 resistors.
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micle
Junior Member
Posts: 57
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Post by micle on Jan 29, 2022 18:01:25 GMT -5
I have already written the voltages to you, they are the same as those with posistor connected. When I measure 1.5v I sometimes hear the relay trip.
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micle
Junior Member
Posts: 57
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Post by micle on Jan 29, 2022 18:07:25 GMT -5
I considered pins 1-2 at the ends of R3232 and pins 2-3 at the ends of the R3023 resistor.
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micle
Junior Member
Posts: 57
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Post by micle on Jan 29, 2022 18:25:53 GMT -5
Now measuring the ends of the R3232 resistor in power ON (without posistor), both ends vary from 1.39 to 1.43 volts.
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