MB Quart DSC1500.1

mike49504 · 5th May 2011, 01:52 AM

Amp powers up and idle's perfectly. Amp is producing both + - regulated voltages And also is producing both + - 82 volts of rail voltage

Amp has no output Wondering where i start?

I noticed the amp has a D1303 transistors Near the output driverboard Is that what they are using for the muting transistor?

Perry Babin · 5th May 2011, 02:23 AM

Post a photo of the board.

mike49504 · 5th May 2011, 02:45 AM

heres some pics of the board i know all the fets arent in right now i gotta clean up the board . i only have a few in for testing

Perry Babin · 5th May 2011, 02:53 AM

Are all of the outputs in it?

Are both power supplies producing output (square wave on the outer legs of the secondary windings?

Is the relay engaging?

Perry Babin · 5th May 2011, 02:57 AM

The file name for the photos indicates that they are for a hifonics amp. Is this the amp you're working on or is it a similar amp (subject says MB Quart).

mike49504 · 5th May 2011, 03:01 AM

Its a MB Quat amp Sorry forgot to change the photo name

mike49504 · 5th May 2011, 03:44 AM

ALL of the outputs are in the amp.

Relays are kicking on.

I see a square wave on the secondary windings

Perry Babin · 5th May 2011, 03:50 AM

Do you see any rail-rail oscillation on the outputs?

mike49504 · 5th May 2011, 03:55 AM

The trace deflects thats all it does

Perry Babin · 5th May 2011, 03:57 AM

Is this audio driver board the one with two 14 pin driver ICs?

5th May 2011, 01:52 AM	#1
mike49504 diyAudio Member Join Date: Sep 2006	MB Quart DSC1500.1 Amp powers up and idle's perfectly. Amp is producing both + - regulated voltages And also is producing both + - 82 volts of rail voltage Amp has no output Wondering where i start? I noticed the amp has a D1303 transistors Near the output driverboard Is that what they are using for the muting transistor?

5th May 2011, 02:23 AM	#2
Perry Babin diyAudio Member Join Date: Nov 2003 Location: Louisiana	Post a photo of the board. __________________ Links >> Basic Car Audio Amp Repair --- Basic Car Audio Electronics --- Basic Transistor Testing --- Basic Switching Power Supply Design --- Basic Computer Skills << Links

5th May 2011, 02:53 AM	#4
Perry Babin diyAudio Member Join Date: Nov 2003 Location: Louisiana	Are all of the outputs in it? Are both power supplies producing output (square wave on the outer legs of the secondary windings? Is the relay engaging? __________________ Links >> Basic Car Audio Amp Repair --- Basic Car Audio Electronics --- Basic Transistor Testing --- Basic Switching Power Supply Design --- Basic Computer Skills << Links

5th May 2011, 02:57 AM	#5
Perry Babin diyAudio Member Join Date: Nov 2003 Location: Louisiana	The file name for the photos indicates that they are for a hifonics amp. Is this the amp you're working on or is it a similar amp (subject says MB Quart). __________________ Links >> Basic Car Audio Amp Repair --- Basic Car Audio Electronics --- Basic Transistor Testing --- Basic Switching Power Supply Design --- Basic Computer Skills << Links

5th May 2011, 03:50 AM	#8
Perry Babin diyAudio Member Join Date: Nov 2003 Location: Louisiana	Do you see any rail-rail oscillation on the outputs? __________________ Links >> Basic Car Audio Amp Repair --- Basic Car Audio Electronics --- Basic Transistor Testing --- Basic Switching Power Supply Design --- Basic Computer Skills << Links


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5th May 2011, 03:01 AM	#6
mike49504 diyAudio Member Join Date: Sep 2006	Its a MB Quat amp Sorry forgot to change the photo name

5th May 2011, 03:44 AM	#7
mike49504 diyAudio Member Join Date: Sep 2006	ALL of the outputs are in the amp. Relays are kicking on. I see a square wave on the secondary windings

5th May 2011, 03:55 AM	#9
mike49504 diyAudio Member Join Date: Sep 2006	The trace deflects thats all it does

5th May 2011, 03:57 AM	#10
Perry Babin diyAudio Member Join Date: Nov 2003 Location: Louisiana	Is this audio driver board the one with two 14 pin driver ICs? __________________ Links >> Basic Car Audio Amp Repair --- Basic Car Audio Electronics --- Basic Transistor Testing --- Basic Switching Power Supply Design --- Basic Computer Skills << Links

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