Massive D400x - Page 4

SS64 · 04:16 PM

well it appears the my scope took a dump on me.. went to power it up, the light comes on but no one appears to be home.. Looks like I'm going to have to get a loaner.. Oh and I forgot to mention before Perry.. I got the epoxy out of the little box without ripping any of the components off.. I found the two other little 8 pin IC's that you where telling me about in there... the numbers have been removed though...

What does this little board do/ control?

Perry Babin · 2nd January 2010, 05:41 PM

These two ICs are part of the modulator. They take in audio and produce a PWM square wave. One is a TL072 and the other is an LM211 unless they've changed the ICs. Can you post a photo of the board? I've never had to repair an amp with one of these.

SS64 · 7th January 2010, 02:03 AM

Yes perry I'll get you a pic asap..update..haven't been able to locate a working scope.. Anything else i could try?

Perry Babin · 7th January 2010, 02:11 AM

Do you have a signal tracer that will allow you to listen to the signal on that pin?

2nd January 2010, 04:12 PM	#31
SS64 diyAudio Member Join Date: Mar 2008	well it appears the my scope took a dump on me.. went to power it up, the light comes on but no one appears to be home.. Looks like I'm going to have to get a loaner.. Oh and I forgot to mention before Perry.. I got the epoxy out of the little box without ripping any of the components off.. I found the two other little 8 pin IC's that you where telling me about in there... the numbers have been removed though... What does this little board do/ control? __________________ It isn't fun unless it can kill you! Last edited by SS64; 2nd January 2010 at 04:16 PM.

2nd January 2010, 05:41 PM	#32
Perry Babin diyAudio Member Join Date: Nov 2003 Location: Louisiana	These two ICs are part of the modulator. They take in audio and produce a PWM square wave. One is a TL072 and the other is an LM211 unless they've changed the ICs. Can you post a photo of the board? I've never had to repair an amp with one of these. __________________ Links >> Basic Car Audio Amp Repair --- Basic Car Audio Electronics --- Basic Transistor Testing --- Basic Switching Power Supply Design --- Basic Computer Skills << Links

7th January 2010, 02:03 AM	#33
SS64 diyAudio Member Join Date: Mar 2008	Yes perry I'll get you a pic asap..update..haven't been able to locate a working scope.. Anything else i could try? __________________ It isn't fun unless it can kill you!

7th January 2010, 02:11 AM	#34
Perry Babin diyAudio Member Join Date: Nov 2003 Location: Louisiana	Do you have a signal tracer that will allow you to listen to the signal on that pin? __________________ 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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