Alpine MRV-1505 - Page 3

seankane · 14th January 2013, 09:43 AM

So I wonder why the -1.736 vdc across when their is only suppose to be .5vdc?

Perry Babin · 14th January 2013, 09:44 AM

The 0.5v is for the resistors.

Perry Babin · 14th January 2013, 09:51 AM

I looked up the datasheet for the LEDs and 1.7 isn't far from spec. I don't guess that I'd be concerned. The service manual is probably wrong. It certainly wouldn't be the first time.

If you ever replace an LED in a circuit where the forward voltage is critical, you need to used a replacement that has the same forward voltage as the original. It wasn't an issue here but it is when the forward voltage is used as a reference.

seankane · 14th January 2013, 09:57 AM

With no audio on pin 2 of IC106 do you think the IC could be defective?

There is supply voltage on pins 1 and 9 if I remember right but nothing on any of the other pins.

If the phase switch was defective could that cause the channels to take turns being dead when switched?

Perry Babin · 14th January 2013, 10:07 AM

Why not just check the switches?

seankane · 14th January 2013, 10:09 AM

I am going to just have to remove all 6 of them.

Perry Babin · 14th January 2013, 10:10 AM

Why do you have to remove them?

You only need to check the three that I listed.

seankane · 14th January 2013, 10:12 AM

I was under the assumption they had to be removed to test them.

Perry Babin · 14th January 2013, 10:12 AM

email me.

babin_perry@yahoo.com

seankane · 18th January 2013, 06:54 AM

I took the phase switch apart and cleaned it, then assebled it back on the board.

The amp produces clean audio on both channels and works great.

Would anyone know where to get a 3 position 12 pin pcb mount switch for this amp?

I would like to replace it with a new one.

14th January 2013, 09:43 AM	#21
seankane diyAudio Member Join Date: May 2010 Location: Washington State	So I wonder why the -1.736 vdc across when their is only suppose to be .5vdc? __________________ 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

14th January 2013, 09:44 AM	#22
Perry Babin diyAudio Member Join Date: Nov 2003 Location: Louisiana	The 0.5v is for the resistors. __________________ Links >> Basic Car Audio Amp Repair * Basic Car Audio Electronics * New Site * Basic Switching Power Supply Design * Basic Computer Skills << Links

14th January 2013, 09:51 AM	#23
Perry Babin diyAudio Member Join Date: Nov 2003 Location: Louisiana	I looked up the datasheet for the LEDs and 1.7 isn't far from spec. I don't guess that I'd be concerned. The service manual is probably wrong. It certainly wouldn't be the first time. If you ever replace an LED in a circuit where the forward voltage is critical, you need to used a replacement that has the same forward voltage as the original. It wasn't an issue here but it is when the forward voltage is used as a reference. __________________ Links >> Basic Car Audio Amp Repair * Basic Car Audio Electronics * New Site * Basic Switching Power Supply Design * Basic Computer Skills << Links

14th January 2013, 09:57 AM	#24
seankane diyAudio Member Join Date: May 2010 Location: Washington State	With no audio on pin 2 of IC106 do you think the IC could be defective? There is supply voltage on pins 1 and 9 if I remember right but nothing on any of the other pins. If the phase switch was defective could that cause the channels to take turns being dead when switched? __________________ 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

14th January 2013, 10:07 AM	#25
Perry Babin diyAudio Member Join Date: Nov 2003 Location: Louisiana	Why not just check the switches? __________________ Links >> Basic Car Audio Amp Repair * Basic Car Audio Electronics * New Site * Basic Switching Power Supply Design * Basic Computer Skills << Links


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14th January 2013, 10:09 AM	#26
seankane diyAudio Member Join Date: May 2010 Location: Washington State	I am going to just have to remove all 6 of them. __________________ 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

14th January 2013, 10:10 AM	#27
Perry Babin diyAudio Member Join Date: Nov 2003 Location: Louisiana	Why do you have to remove them? You only need to check the three that I listed. __________________ Links >> Basic Car Audio Amp Repair * Basic Car Audio Electronics * New Site * Basic Switching Power Supply Design * Basic Computer Skills << Links

14th January 2013, 10:12 AM	#28
seankane diyAudio Member Join Date: May 2010 Location: Washington State	I was under the assumption they had to be removed to test them. __________________ 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

14th January 2013, 10:12 AM	#29
Perry Babin diyAudio Member Join Date: Nov 2003 Location: Louisiana	email me. babin_perry@yahoo.com __________________ Links >> Basic Car Audio Amp Repair * Basic Car Audio Electronics * New Site * Basic Switching Power Supply Design * Basic Computer Skills << Links

18th January 2013, 06:54 AM	#30
seankane diyAudio Member Join Date: May 2010 Location: Washington State	I took the phase switch apart and cleaned it, then assebled it back on the board. The amp produces clean audio on both channels and works great. Would anyone know where to get a 3 position 12 pin pcb mount switch for this amp? I would like to replace it with a new one. __________________ 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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