Mcintosh mc440m in protect mode

LANNYMAN73 · 18th October 2010, 02:45 AM

i purchased this amp used off ebay. when i originally powered it up,the amp did nothing. i proceded to take it apart. i found a overheated wire[ BROKEN] in the circuit board coming from the sub sw. and going to an input amp. made the repair, repowered the amp and the fans turned on but so did the protect led. when the amp is in 4 5 or 6 ch with sub sw. to out, the amp stays in protect. when in 6 ch with sub sw to 120 or 80, protect led goes off. i have replaced all leaking caps but still the same.i was hoping someone from here might be able to point me in the right direction. thanks in advance, shawn

Perry Babin · 18th October 2010, 04:37 AM

If you set the switches so that it doesn't go into protect mode, does it produce audio?

LANNYMAN73 · 18th October 2010, 12:14 PM

no, i haven,t tried that. wasn,t sure if it could damage my head unit. ill try on an old one tonight. thanks

LANNYMAN73 · 20th October 2010, 01:22 AM

Well i got it hooked up and ch 1 2 3 &4 seem to work fine in 6 ch with sub sw. set to 120 or 80. As soon as i switch the sub sw. to out, it goes into protect mode and i get no sound from ch 1 2 3 or 4. Any suggestions, thanks shawn

18th October 2010, 02:45 AM	#1
LANNYMAN73 diyAudio Member Join Date: Sep 2010	Mcintosh mc440m in protect mode i purchased this amp used off ebay. when i originally powered it up,the amp did nothing. i proceded to take it apart. i found a overheated wire[ BROKEN] in the circuit board coming from the sub sw. and going to an input amp. made the repair, repowered the amp and the fans turned on but so did the protect led. when the amp is in 4 5 or 6 ch with sub sw. to out, the amp stays in protect. when in 6 ch with sub sw to 120 or 80, protect led goes off. i have replaced all leaking caps but still the same.i was hoping someone from here might be able to point me in the right direction. thanks in advance, shawn

18th October 2010, 04:37 AM	#2
Perry Babin diyAudio Member Join Date: Nov 2003 Location: Louisiana	If you set the switches so that it doesn't go into protect mode, does it produce audio? __________________ Links >> Basic Car Audio Amp Repair --- Basic Car Audio Electronics --- Basic Transistor Testing --- Basic Switching Power Supply Design --- Basic Computer Skills << Links

18th October 2010, 12:14 PM	#3
LANNYMAN73 diyAudio Member Join Date: Sep 2010	mc440m no, i haven,t tried that. wasn,t sure if it could damage my head unit. ill try on an old one tonight. thanks

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20th October 2010, 01:22 AM	#4
LANNYMAN73 diyAudio Member Join Date: Sep 2010	Well i got it hooked up and ch 1 2 3 &4 seem to work fine in 6 ch with sub sw. set to 120 or 80. As soon as i switch the sub sw. to out, it goes into protect mode and i get no sound from ch 1 2 3 or 4. Any suggestions, thanks shawn

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