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Old 24th February 2012, 03:08 AM   #1
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Default mtx thunder 2 channel

working on an MTX thunder 8302. build date is 5/11/01. amp had shorted (x2)ssp45n20a. I pulled them and now the amp turns on. rail voltage is +/_ 32volts. It shows 15volts dc voltage on outputs. I have fired the amp up with a inline current limiter and measured some dc voltage at emmiter resistors for some of the remaining outputs. the lowest is .ooo5volts and the highest is .0006volts. Also all of the power supply filter and storage caps are ready to pop. Sorry for two much info in one post.

IC#494
Pin 1: 2.35
Pin 2: 2.35
Pin 3: 3.41
Pin 4: .844
Pin 5: 1.55
Pin 6: 3.44
Pin 7: .004
Pin 8: 12.76
Pin 9: .004
Pin 10: .004
Pin 11: 12.76
Pin 12: 12.81
Pin 13: 5.026
Pin 14: 5.026
Pin 15: 5.026
Pin 16:.004
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Old 24th February 2012, 03:19 AM   #2
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i will send a pic of the board in the morning.
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Old 24th February 2012, 08:08 PM   #3
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Which two of the outputs (circuit board designations) are out of the circuit?

Do you have any significant DC voltage across either pair of speaker terminals?
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Old 25th February 2012, 02:58 AM   #4
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check on that tomarrow. Work was swamped today. thanks
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Old 25th February 2012, 08:19 PM   #5
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removed fet 315 and 316. With fluke negative at main ground i have 7volt dc on right negative output and -7volts on left positive output. with fluke neg. @ rca shield i measure almost 30volts for the right channel and 18 volts for left.
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Old 25th February 2012, 10:38 PM   #6
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suitable replacement for ssp45n20a? both channels use 4 each.
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Old 25th February 2012, 11:45 PM   #7
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found a burnt component right next to the main storage caps. circuit board designation d92. top of says 817b, i think can't make out the bottom. Diode i presume?
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Old 26th February 2012, 12:00 AM   #8
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[IMG]Click the image to open in full size.[/IMG]

[IMG]Click the image to open in full size.[/IMG]
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Old 27th February 2012, 12:37 AM   #9
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Does D 92 have one end connected to the main ground and the other end connected to the shield ground?

If it's shorted, you'll have to remove it to check for the connections to the grounds.

The IRF3415 should be a good sub for the SSP FETs.
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Old 27th February 2012, 03:43 AM   #10
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im not with the amplifier right now to answer that. I can say that d92 needs replacement. Do you know if it is a zener diode?
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