Alpine MRV-1507 - Page 5

seankane · 3rd January 2013, 08:05 AM

So I need to replace all of the outputs back into the amp before further trouble shooting?

Perry Babin · 3rd January 2013, 08:08 AM

Yes. Check the various gate resistors and reduce the bias before applying power.

seankane · 3rd January 2013, 08:15 AM

Same as a rockford all the way ccw?

Perry Babin · 3rd January 2013, 05:17 PM

It should be.

seankane · 09:31 AM

I replaced all of the outputs and powered the amp and same result.

The power supply is pulsing on and off and I have pulsing DC on the one channel.

With the new outputs installed hooking a dummy load to the terminals does not allow the amp to power up now.

Just thought I would mention the RCA jacks are badly damaged, one of the female plugs is completely gone. Can this cause any issues?

seankane · 10:16 AM

Please read post #45 first.

The power light is blinking red and the protection light is blinking red.

Blinking red on the protection says floating rca shield ground and if the RCA jacks are badly damaged can this cause the blinking red?

The blinking red power light says battery voltage below 10 volts, well I have 14.56 going to it. What tells the amp the battery voltage is to low?

If the RCA shield ground is broken will this keep the amp from powering up?

If I disconnect the 10P connector from the output board the amp will produce rail voltage but their is rail voltage on the problem channel output terminal. With the 10P connector plugged in the amp will not produce rail and does the pulsing. Only 2 terminals of that plug have voltage. One terminal has full rail and one has 8.50 vdc the rest have no DC measured.

This amp is very confusing. I am beggining to dislike working on ALPINE amps.

rickcl · 4th January 2013, 07:54 PM

This might have been covered already but the prorect light will blink if the head unit is not hooked up.

Perry Babin · 4th January 2013, 09:35 PM

There may be a problem in the low voltage detection circuit. The Zener that's used as a reference often becomes leaky. That's a minor problem that can be dealt with after you get the amp working.

The floating ground indicator will blink if not head unti is connected (as was previously mentioned) but will also blink if you're using a signal source that has a floating ground (like an MP3 player) or if you have the head unit on a supply that doesn't have it's ground connected to the ground on the power supply that you're using to power the amp.

The broken RCA jack shouldn't cause any problems with the amp powering up, especially with no RCAs plugged in.

Did you check all of the small transistors in that channel to see if any were shorted?

seankane · 13th January 2013, 02:15 AM

Ok replaced the RCA jacks, pulled all of the 25 small transistors in the channel. All tested fine except for one leaky driver a 2SC2690A and replaced it with a BD139 as well as the one next to it. I also replaced the 2SA1220A's with BD140's.

The amp powers up all 3 lights green and produces nice clean sine wave and sounds great on the old XLC sub!!!

Thanks again Perry.

3rd January 2013, 08:05 AM	#41
seankane diyAudio Member Join Date: May 2010 Location: Washington State	So I need to replace all of the outputs back into the amp before further trouble shooting? __________________ Pyramid 52 Amp Power Supply----Fluke 787 Processmeter----Tektronix 465 Scope----Velleman HPS40 Scope----Soldering Iron----Desoldering Iron----Hejet HJ 500-S Heatgun----DM4070 Digital LCR Meter----Propane Torch

3rd January 2013, 08:08 AM	#42
Perry Babin diyAudio Member Join Date: Nov 2003 Location: Louisiana	Yes. Check the various gate resistors and reduce the bias before applying power. __________________ Links >> Basic Car Audio Amp Repair * Basic Car Audio Electronics * New Site * Basic Switching Power Supply Design * Basic Computer Skills << Links

3rd January 2013, 08:15 AM	#43
seankane diyAudio Member Join Date: May 2010 Location: Washington State	Same as a rockford all the way ccw? __________________ Pyramid 52 Amp Power Supply----Fluke 787 Processmeter----Tektronix 465 Scope----Velleman HPS40 Scope----Soldering Iron----Desoldering Iron----Hejet HJ 500-S Heatgun----DM4070 Digital LCR Meter----Propane Torch

3rd January 2013, 05:17 PM	#44
Perry Babin diyAudio Member Join Date: Nov 2003 Location: Louisiana	It should be. __________________ Links >> Basic Car Audio Amp Repair * Basic Car Audio Electronics * New Site * Basic Switching Power Supply Design * Basic Computer Skills << Links

4th January 2013, 09:13 AM	#45
seankane diyAudio Member Join Date: May 2010 Location: Washington State	I replaced all of the outputs and powered the amp and same result. The power supply is pulsing on and off and I have pulsing DC on the one channel. With the new outputs installed hooking a dummy load to the terminals does not allow the amp to power up now. Just thought I would mention the RCA jacks are badly damaged, one of the female plugs is completely gone. Can this cause any issues? __________________ Pyramid 52 Amp Power Supply----Fluke 787 Processmeter----Tektronix 465 Scope----Velleman HPS40 Scope----Soldering Iron----Desoldering Iron----Hejet HJ 500-S Heatgun----DM4070 Digital LCR Meter----Propane Torch Last edited by seankane; 4th January 2013 at 09:31 AM.


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4th January 2013, 09:48 AM	#46
seankane diyAudio Member Join Date: May 2010 Location: Washington State	Please read post #45 first. The power light is blinking red and the protection light is blinking red. Blinking red on the protection says floating rca shield ground and if the RCA jacks are badly damaged can this cause the blinking red? The blinking red power light says battery voltage below 10 volts, well I have 14.56 going to it. What tells the amp the battery voltage is to low? If the RCA shield ground is broken will this keep the amp from powering up? If I disconnect the 10P connector from the output board the amp will produce rail voltage but their is rail voltage on the problem channel output terminal. With the 10P connector plugged in the amp will not produce rail and does the pulsing. Only 2 terminals of that plug have voltage. One terminal has full rail and one has 8.50 vdc the rest have no DC measured. This amp is very confusing. I am beggining to dislike working on ALPINE amps. __________________ Pyramid 52 Amp Power Supply----Fluke 787 Processmeter----Tektronix 465 Scope----Velleman HPS40 Scope----Soldering Iron----Desoldering Iron----Hejet HJ 500-S Heatgun----DM4070 Digital LCR Meter----Propane Torch Last edited by seankane; 4th January 2013 at 10:16 AM.

4th January 2013, 07:54 PM	#47
rickcl diyAudio Member Join Date: Mar 2003 Location: California	This might have been covered already but the prorect light will blink if the head unit is not hooked up.

4th January 2013, 09:35 PM	#48
Perry Babin diyAudio Member Join Date: Nov 2003 Location: Louisiana	There may be a problem in the low voltage detection circuit. The Zener that's used as a reference often becomes leaky. That's a minor problem that can be dealt with after you get the amp working. The floating ground indicator will blink if not head unti is connected (as was previously mentioned) but will also blink if you're using a signal source that has a floating ground (like an MP3 player) or if you have the head unit on a supply that doesn't have it's ground connected to the ground on the power supply that you're using to power the amp. The broken RCA jack shouldn't cause any problems with the amp powering up, especially with no RCAs plugged in. Did you check all of the small transistors in that channel to see if any were shorted? __________________ Links >> Basic Car Audio Amp Repair * Basic Car Audio Electronics * New Site * Basic Switching Power Supply Design * Basic Computer Skills << Links

13th January 2013, 02:15 AM	#49
seankane diyAudio Member Join Date: May 2010 Location: Washington State	Ok replaced the RCA jacks, pulled all of the 25 small transistors in the channel. All tested fine except for one leaky driver a 2SC2690A and replaced it with a BD139 as well as the one next to it. I also replaced the 2SA1220A's with BD140's. The amp powers up all 3 lights green and produces nice clean sine wave and sounds great on the old XLC sub!!! Thanks again Perry. __________________ Pyramid 52 Amp Power Supply----Fluke 787 Processmeter----Tektronix 465 Scope----Velleman HPS40 Scope----Soldering Iron----Desoldering Iron----Hejet HJ 500-S Heatgun----DM4070 Digital LCR Meter----Propane Torch

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