Lunar Remote Turn on issue

0ldSch00lf00l · 21st November 2010, 06:24 AM

I picked up a used Lunar 200x2 amplifier today and it has a weird remote turn-on issue. If i use the remote turn on from my head unit or step up through a relay, the amplifier and head unit (and relay when used) just cycle click and nothing turns on. If I jump over from the positive to the remote turn on, the amp fires up, plays fine, and doesn't even blow the 3 amp fuse I used to protect it.

The only "diagnostic" issue I found is that the remote turn-on at the amplifier seems to show 1.005 k ohm of resistance to ground until it is energized. I also tried the head unit's remote turn on lead connected directly to another amplifier's remote turn on input and it was able to turn it on with no problems. I believe I safely ruled out the head unit as a problem.

I was wondering if this could be a simple fix or something requiring a trip back to QAS?

amc32 · 21st November 2010, 07:59 AM

What sort of relay are you using,is it a Bosch. If so what color is it?

0ldSch00lf00l · 21st November 2010, 08:35 AM

My external relay is a black Bosch. Another friend said my Alpine 9885 may be too weak to energize the relay and/or the amp's remote turn on. The last time I had a problem with an Alpine not turning stuff on, it was with my 7941. I am getting tired now, but I may try a Pioneer HU that I have laying around and see if it offers a better remote turn on signal.

The thing that is puzzling me is the fact that the amp works when I jump over from power to remote turn on using a 3 amp fuse to protect the connection.

Perry Babin · 21st November 2010, 01:11 PM

If you use the head unit's remote turn-on output to energize the relay coil alone, will the relay engage and remain engaged?

0ldSch00lf00l · 21st November 2010, 04:49 PM

The head unit will energize the relay and I read the stepped up voltage through it. It will also turn the known working amplifier on through the relay (just tested that).

Also, I think I was told the wrong model of the amplifier. It is the same size as my L2125 so I am thinking that this it is a L100x2.

Perry Babin · 21st November 2010, 06:55 PM

Connect terminal 30 of the relay to the remote turn-on of the amp. Connect terminal 87 to the B+ terminal of the amp. Does the amp power up?

0ldSch00lf00l · 21st November 2010, 10:04 PM

Quote:

Originally Posted by Perry Babin

Connect terminal 30 of the relay to the remote turn-on of the amp. Connect terminal 87 to the B+ terminal of the amp. Does the amp power up?

It does the weird cycling thing when I connect the relay this way too. The only way to get the amplifier to turn on is to either jump it from power or put +12v on a toggle to remote. This issue has me scratching my head.

Perry Babin · 21st November 2010, 10:17 PM

Measure the voltage across the relay coil as it's cycling.

0ldSch00lf00l · 22nd November 2010, 05:13 AM

I measure between 200 and 230 mV across the coil as it is switching on and off. Back to my head scratching.

Perry Babin · 22nd November 2010, 05:17 AM

Is the ground side of the coil connected to a good ground?

Is the remote turn-on connected to anything other than the relay coil?

21st November 2010, 06:24 AM	#1
0ldSch00lf00l diyAudio Member Join Date: Aug 2008 Location: Lafayette, Louisiana	Lunar Remote Turn on issue I picked up a used Lunar 200x2 amplifier today and it has a weird remote turn-on issue. If i use the remote turn on from my head unit or step up through a relay, the amplifier and head unit (and relay when used) just cycle click and nothing turns on. If I jump over from the positive to the remote turn on, the amp fires up, plays fine, and doesn't even blow the 3 amp fuse I used to protect it. The only "diagnostic" issue I found is that the remote turn-on at the amplifier seems to show 1.005 k ohm of resistance to ground until it is energized. I also tried the head unit's remote turn on lead connected directly to another amplifier's remote turn on input and it was able to turn it on with no problems. I believe I safely ruled out the head unit as a problem. I was wondering if this could be a simple fix or something requiring a trip back to QAS?

21st November 2010, 07:59 AM	#2
amc32 diyAudio Member Join Date: Mar 2008	What sort of relay are you using,is it a Bosch. If so what color is it? __________________ ...............I Hear in color.................

21st November 2010, 01:11 PM	#4
Perry Babin diyAudio Member Join Date: Nov 2003 Location: Louisiana	If you use the head unit's remote turn-on output to energize the relay coil alone, will the relay engage and remain engaged? __________________ Links >> Basic Car Audio Amp Repair --- Basic Car Audio Electronics --- Basic Transistor Testing --- Basic Switching Power Supply Design --- Basic Computer Skills << Links

21st November 2010, 06:55 PM	#6
Perry Babin diyAudio Member Join Date: Nov 2003 Location: Louisiana	Connect terminal 30 of the relay to the remote turn-on of the amp. Connect terminal 87 to the B+ terminal of the amp. Does the amp power up? __________________ Links >> Basic Car Audio Amp Repair --- Basic Car Audio Electronics --- Basic Transistor Testing --- Basic Switching Power Supply Design --- Basic Computer Skills << Links

21st November 2010, 10:17 PM	#8
Perry Babin diyAudio Member Join Date: Nov 2003 Location: Louisiana	Measure the voltage across the relay coil as it's cycling. __________________ 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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21st November 2010, 08:35 AM	#3
0ldSch00lf00l diyAudio Member Join Date: Aug 2008 Location: Lafayette, Louisiana	My external relay is a black Bosch. Another friend said my Alpine 9885 may be too weak to energize the relay and/or the amp's remote turn on. The last time I had a problem with an Alpine not turning stuff on, it was with my 7941. I am getting tired now, but I may try a Pioneer HU that I have laying around and see if it offers a better remote turn on signal. The thing that is puzzling me is the fact that the amp works when I jump over from power to remote turn on using a 3 amp fuse to protect the connection.

21st November 2010, 04:49 PM	#5
0ldSch00lf00l diyAudio Member Join Date: Aug 2008 Location: Lafayette, Louisiana	The head unit will energize the relay and I read the stepped up voltage through it. It will also turn the known working amplifier on through the relay (just tested that). Also, I think I was told the wrong model of the amplifier. It is the same size as my L2125 so I am thinking that this it is a L100x2.

22nd November 2010, 05:13 AM	#9
0ldSch00lf00l diyAudio Member Join Date: Aug 2008 Location: Lafayette, Louisiana	I measure between 200 and 230 mV across the coil as it is switching on and off. Back to my head scratching.

22nd November 2010, 05:17 AM	#10
Perry Babin diyAudio Member Join Date: Nov 2003 Location: Louisiana	Is the ground side of the coil connected to a good ground? Is the remote turn-on connected to anything other than the relay coil? __________________ 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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