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Old 3rd February 2005, 11:36 PM   #21
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b4 i even start, it seems that the mosFETs are overheated. the white thermal contact thingy to the heat sinks are spread everywhere.

i tested, what it seems to be transistors looking (3pins), four different types.

click here for amp pic

the first four blue motorola chip, it seems to be some sort of diodes... i think. then theres the suspected mosFET, all 10 consecutive chips.
-the10 chips has characters on them and its as follow: IRF234 IR8923 5S JN

the suspected chips: 1(gate) and 2(drain) has 12volt constant and the 3(source) has ground. this was tested using a DMM while the blue remote wire is DISconnected.
_______________________________________

the other side of the wall, they seems to be some some sort of transistor looking but testing it, the 1&3 has ~.5V constant.

2N6490 8915 by motorola are the 1st five chip from the left and the following chips has the similar numerical designation.
_______________________________________
the TS1, thermal sensor suspect was cutted out.. dont ask me why...but it was burnt in the middle of the cylinder.

i dont know what exactly know what i am testing...... plz help
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Old 3rd February 2005, 11:45 PM   #22
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also notice about the resistor on the right bottm corner, it looks burnt. the resistance is slightly diff from all the others.
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Old 3rd February 2005, 11:49 PM   #23
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Default Hold on...

The thermal "sensor" is actually a diode - it's not burnt in the middle - that's the PN gap you're looking at. Put it back in.

I can see right away that Emitter Resistor R55 is burnt to a crisp. Know what that tells me? Q28 is shorted. Others are probably, too. Check and replace those outputs (probably 2N6488/2N6419) then try again. Bad outputs will blow the fuse quickly on any PPI.

Ok, I see that you already mentioned the resistor before I posted.
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Old 4th February 2005, 12:12 AM   #24
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Quote:
Originally posted by K-amps
In your opinion, are they good amps?

Which? The PCs are very nice for SS amps.
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Old 4th February 2005, 12:14 AM   #25
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Quote:
Originally posted by TO-3



Which? The PCs are very nice for SS amps.

The PC-2350. Cause I love it!
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Old 4th February 2005, 12:37 AM   #26
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that TS1 line, it reads 12volt on my DMM. hows that a diode into it? still confuse.

for now, if the chips are screwed up i really dont know how to test it. i havent test.

i need to know the order of how to test the power switch thingy...... i am confuse.

do i need to worry about the PWM at this time of testing?

can someone pointl out to me what are those chips exactly is.

i know this seems frustrated to yall, am still learning.
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Old 4th February 2005, 12:38 AM   #27
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Quote:
Originally posted by profuse007
b4 i even start, it seems that the mosFETs are overheated. the white thermal contact thingy to the heat sinks are spread everywhere.

i tested, what it seems to be transistors looking (3pins), four different types.

click here for amp pic

the first four blue motorola chip, it seems to be some sort of diodes... i think.
Yes the blue Motorolas are your rectifier diodes.

Quote:

then theres the suspected mosFET, all 10 consecutive chips.
-the10 chips has characters on them and its as follow: IRF234 IR8923 5S JN

the suspected chips: 1(gate) and 2(drain) has 12volt constant and the 3(source) has ground. this was tested using a DMM while the blue remote wire is DISconnected.
Do a continuity test between the tab(same as pin2) and pin 1. As these are mosfets, the resistace should be very high. The source's are most likely grounded through the transformer. Those switchers, I think, are obsolete now, but you can still find Z44's that we always used for replacements. You would have to replace all 10 of them with the same parts. Also, if you do need to replace the switchers, replace the gate resistors, that are 47ohms, to 22 ohms.

[quote]the other side of the wall, they seems to be some some sort of transistor looking but testing it, the 1&3 has ~.5V constant.

2N6490 8915 by motorola are the 1st five chip from the left and the following chips has the similar numerical designation.
[quote]

Again, I think these parts are obsolete, but can be replaced with 2N6492 and 2N6488's. You'll have to look at the data sheets for those parts, but if I can recall correctly, the formers are PNP's. You may be able to get by with just replacing the outputs, but sometimes, you may also have to look at the drivers for the outputs, as they may have gotten fried too. But if only one output is shorted, you may only really need to replace that one. R55 is a ballast resistor, and I agree, it should be replaced.

Quote:
the TS1, thermal sensor suspect was cutted out.. dont ask me why...but it was burnt in the middle of the cylinder.

i dont know what exactly know what i am testing...... plz help
Without seeing the part in TS1, I can't recall what the part is. I'll have to think about that.
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Old 4th February 2005, 12:40 AM   #28
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Quote:
Originally posted by profuse007
that TS1 line, it reads 12volt on my DMM. hows that a diode into it? still confuse.

for now, if the chips are screwed up i really dont know how to test it. i havent test.

i need to know the order of how to test the power switch thingy...... i am confuse.

do i need to worry about the PWM at this time of testing?

can someone pointl out to me what are those chips exactly is.

i know this seems frustrated to yall, am still learning.
Do you have an o-scope?
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Old 4th February 2005, 12:41 AM   #29
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Quote:
Originally posted by K-amps



The PC-2350. Cause I love it!
Yes, that amp is truly sick!!!!
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Old 4th February 2005, 01:21 AM   #30
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Default I repair these amps...

If you want it back in less than a week. I have all the parts for them in stock. $75 (incl parts) plus shipping to 45420 and it will be good as new.

TS1 is a diode. You'll measure 12V because it is a difference element in a comparator circuit. Once the voltage gets to, say 11.4V, the comparator will trip and power down the amp.

Good luck, or look me up.

Regards,
Aaron
Envision Electronics
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