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Old 9th July 2008, 07:42 PM   #11
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Just for be sure...

Some one has the right values for Q510 and Q500?

Thanks
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Old 9th July 2008, 08:50 PM   #12
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I don't have information for the 300/2 but in the 300/4, Q500 is one of the power supply FETs. The power supply FETs in most of this series of amps is an IRFZ44.

In the 300/4 Q510 is an IRFZ34. If your amp uses the 3843B to drive Q510, it's likely an IRFZ34. An IRFZ44 would also work in that location.

If you have a scope, monitor the voltage on pin 20 of the audio driver board (looking at component side of driver board, it's the last pin on the right). If it's not very near 0v on one channel or you see a short pulse on one channel, you need to determine why it's going high.
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Old 9th July 2008, 10:14 PM   #13
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Quote:
Originally posted by Perry Babin
I don't have information for the 300/2 but in the 300/4, Q500 is one of the power supply FETs. The power supply FETs in most of this series of amps is an IRFZ44.

On this amp, all the power supply fets are FQP65N06, too Q510 are FQP65N06.

Always in all slash I have see the IRFZ44, this is the reason for my question.

300/2 PCB 100009

REV 1 9/22/00
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Old 16th July 2008, 12:54 AM   #14
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After few days, I will follow:

The intermittent shut down is finish. They shut down only if the volume is high.

The amp works, clean audio, but the current is 4.5 Amp.

The pin 20 itís OK. Thanks Perry

R513 and Q510 are very hot (I quit for measure, and they are ok.)
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Old 16th July 2008, 01:44 AM   #15
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Did you try adjusting the bias to reduce the current draw?

How is R513 being used?

There are probably several 4.7 ohm resistors near the filter capacitors for the small yellow transformer. Are any of them getting hot?
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Old 16th July 2008, 11:49 PM   #16
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the 4 resistors (4R7) are good and none hot when working.

R513 is 33 ohm, and itīs fine too.
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Old 17th July 2008, 12:00 AM   #17
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Is the diode in parallel with the 33 ohm resistor OK? You'll have to pull one end to check it.

Does the yellow transformer look like it's overheated (windings showing through the yellow tape)?

Do the waveforms look similar to these?
http://www.bcae1.com/temp/jl500slash...ransformer.swf
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Old 17th July 2008, 04:28 AM   #18
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The diode in parallel itís fine. Another near diodes is fine too.

The transformer not show visible overheat

When disconnect remote, The amp still turn on 5 seconds more.

In the same order:

Scope is setting to 5us, 5V.

Pin1
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Pin2
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Pin3
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Pin4
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Pin5
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Pin6
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Pin7
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Pin8
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Pin9
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Pin10
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Old 17th July 2008, 05:30 AM   #19
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Is the vertical amplifier set to 5v/div for all waveforms?

If the vertical amplifier setting for pins 1 and 10 is the same, it appears that the transformer may be defective. Pin 10 should have DC (approximately the same as the B+ input).
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Old 22nd September 2008, 03:28 AM   #20
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After few months, I can bought one working condition yellow transformer.

Now the amp never shout down, but is current 4 Amp!!!!

Q510 is too hot, its a FQP65N6.

ŅAny idea?
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