Problem with Alpine 3544

JoergST · 29th July 2008, 03:43 PM

Hello I got an alpine 3544 amplifier and it doesn´t work.
The problem is, that the amplifier doesn´t turn on.
There is no voltage at the µPC494C and the transistors in the amplifier area hasn´t got there voltage.

The only voltage that i can measure is at the transistor in the power supply area. with 12,80V.
I have got an 13,9V with 10A power supply to connect it to the 3544 alpine amplifier.
And I conact the remote cable, but nothing happen.
Does somebody has got an idea. If you want photos I can upload someone.

Anybody a service manual for this amplifier?
Regards Jörg

Perry Babin · 29th July 2008, 08:53 PM

Q813 is the switching transistor that delivers power to the 494. That would be the first place to check for voltage.

Email me and I'll send you the schematic.

babin_perry@yahoo.com

JoergST · 30th July 2008, 06:17 PM

Perry you are great!!!!!!

The q813 was defect but it was not to 100% defect. The way B und C was defect. B and E works.
I must order a new transistor and than i hope it will work.
Regards Jörg

bmwpowere36m3 · 4th October 2009, 04:47 AM

Hi, Perry do you still have a schematic around for this amplifier. Mine basically starts up, indicator light goes from orange to green and then a second later blows both onboard 30A fuses. I have it opened up, but I don't see anything obvious...

Anything I should check for or any tips would be great.

Perry Babin · 4th October 2009, 09:13 AM

It sounds like it has shorted output transistors.

Email me if you want the schematic diagram.

babin_perry@yahoo.com

bmwpowere36m3 · 4th October 2009, 03:52 PM

Thanks for the schematic, so looking at it... the output transistors would be under "Power Stage," labeled: "Q505-Q516" (2SC3421, 2SC3182, 2SA1358, 2SA1265 devices).

Perry Babin · 4th October 2009, 03:58 PM

Q509-q516

bmwpowere36m3 · 4th October 2009, 04:02 PM

Quote:

Originally Posted by Perry Babin

Q509-q516

Awesome, will checking them while in the circuit via a DMM (diode check) be sufficient?

jol50 · 4th October 2009, 10:07 PM

Yes look for shorts, if you don't find any check the outputs...the other large transistors on the sink. Note the rectifiers may normally show a short.

bmwpowere36m3 · 5th October 2009, 04:14 AM

Well, I pulled all the output transistors and 1 output transistor tested bad (shorted), good thing I removed them because in circuit they all tested bad

The other transistors on the heat-sinks tested fine, but the diode rectifiers show a short in two positions. For one, they both are shorted on the outside pins A-C (my understanding that's normal due to being connected to the transformer). Second, on D802 & D801 there's a short A-B.

If the diode/s blew wouldn't it cause more damage?

29th July 2008, 03:43 PM	#1
JoergST diyAudio Member Join Date: Jul 2006	Problem with Alpine 3544 Hello I got an alpine 3544 amplifier and it doesn´t work. The problem is, that the amplifier doesn´t turn on. There is no voltage at the µPC494C and the transistors in the amplifier area hasn´t got there voltage. The only voltage that i can measure is at the transistor in the power supply area. with 12,80V. I have got an 13,9V with 10A power supply to connect it to the 3544 alpine amplifier. And I conact the remote cable, but nothing happen. Does somebody has got an idea. If you want photos I can upload someone. Anybody a service manual for this amplifier? Regards Jörg

29th July 2008, 08:53 PM	#2
Perry Babin diyAudio Member Join Date: Nov 2003 Location: Louisiana	Q813 is the switching transistor that delivers power to the 494. That would be the first place to check for voltage. Email me and I'll send you the schematic. babin_perry@yahoo.com __________________ Links >> Basic Car Audio Amp Repair --- Basic Car Audio Electronics --- Basic Transistor Testing --- Basic Switching Power Supply Design --- Basic Computer Skills << Links

4th October 2009, 09:13 AM	#5
Perry Babin diyAudio Member Join Date: Nov 2003 Location: Louisiana	It sounds like it has shorted output transistors. Email me if you want the schematic diagram. babin_perry@yahoo.com __________________ Links >> Basic Car Audio Amp Repair --- Basic Car Audio Electronics --- Basic Transistor Testing --- Basic Switching Power Supply Design --- Basic Computer Skills << Links

4th October 2009, 03:58 PM	#7
Perry Babin diyAudio Member Join Date: Nov 2003 Location: Louisiana	Q509-q516 __________________ 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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30th July 2008, 06:17 PM	#3
JoergST diyAudio Member Join Date: Jul 2006	Perry you are great!!!!!! The q813 was defect but it was not to 100% defect. The way B und C was defect. B and E works. I must order a new transistor and than i hope it will work. Regards Jörg

4th October 2009, 04:47 AM	#4
bmwpowere36m3 diyAudio Member Join Date: Apr 2008	Hi, Perry do you still have a schematic around for this amplifier. Mine basically starts up, indicator light goes from orange to green and then a second later blows both onboard 30A fuses. I have it opened up, but I don't see anything obvious... Anything I should check for or any tips would be great.

4th October 2009, 03:52 PM	#6
bmwpowere36m3 diyAudio Member Join Date: Apr 2008	Thanks for the schematic, so looking at it... the output transistors would be under "Power Stage," labeled: "Q505-Q516" (2SC3421, 2SC3182, 2SA1358, 2SA1265 devices).

4th October 2009, 10:07 PM	#9
jol50 diyAudio Member Join Date: Nov 2007	Yes look for shorts, if you don't find any check the outputs...the other large transistors on the sink. Note the rectifiers may normally show a short.

5th October 2009, 04:14 AM	#10
bmwpowere36m3 diyAudio Member Join Date: Apr 2008	Well, I pulled all the output transistors and 1 output transistor tested bad (shorted), good thing I removed them because in circuit they all tested bad The other transistors on the heat-sinks tested fine, but the diode rectifiers show a short in two positions. For one, they both are shorted on the outside pins A-C (my understanding that's normal due to being connected to the transformer). Second, on D802 & D801 there's a short A-B. If the diode/s blew wouldn't it cause more damage?

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