JBL BP 1200.1 Project

poopydoopynoopy · 06:14 PM

Greetings.
I am shopping for replacement parts for this amplifier, I have Mr. Babin's repair tutorial, and am an experienced tech.
The first question I have is about the two large filter caps in said amp.
One is bulged and the other is not.
I intend to replace them both, along with a lot of other parts in here.
The max height with bottom cover installed is ~35mm.
Is this a suitable replacement?
Thanks for the help, and I will cover this repair completely in this thread for the next guy/gal to use...

paul

Perry Babin · 24th February 2010, 06:51 PM

Those are likely a good choice. CD makes good quality capacitors.

poopydoopynoopy · 24th February 2010, 07:32 PM

great, ordered!
More to follow, Many thanks !

paul

poopydoopynoopy · 27th February 2010, 10:31 PM

Is THIS ok to use instead of a1266?
This is my first car amp btw...

paul

Perry Babin · 27th February 2010, 10:59 PM

Those should work. Replace both drivers (Q741 and Q751).

poopydoopynoopy · 27th February 2010, 11:07 PM

was my plan

They both give 108 ohms...

Glowbug · 2nd March 2010, 12:25 PM

I remember installing a few of those for my friends in high school (around '03). Great value for a used amp

poopydoopynoopy · 2nd March 2010, 03:16 PM

I bought this one for $200 new in 2000 from an online discounter by the name of Yoshi.
It happily ran 2 alpine r's until 2005 when I quite accidentally turned it on with shorted speaker wire.
The smoke and fire was quite surprising, really.
I tried to fix it once replacing only the power supply fet's. I did not fully understand the cause and effect associated with these types of failures.
You can guess what happened when I powered it up.
So now I have all the info and am doing all the testing and we shall see what happens this time.

poopydoopynoopy · 5th March 2010, 03:10 AM

Ok.
I have the amp stripped of all fet's power and output.
Also have filter caps out and tl494 + 1266 drivers out.
Amp powers up fine.
Installed new filter caps, now it goes into protect.
Rectifiers are in, test good, and were never removed. All FET's/494/1266's are still out.

Normal?

paul

Perry Babin · 5th March 2010, 03:38 AM

Looking at the schematic diagram, it would appear that this is normal. Initially, the red LED is lit. It is driven off when the 494 begins to produce output.

24th February 2010, 06:12 PM	#1
poopydoopynoopy diyAudio Member Join Date: Oct 2008 Location: 97220	JBL BP 1200.1 Project Greetings. I am shopping for replacement parts for this amplifier, I have Mr. Babin's repair tutorial, and am an experienced tech. The first question I have is about the two large filter caps in said amp. One is bulged and the other is not. I intend to replace them both, along with a lot of other parts in here. The max height with bottom cover installed is ~35mm. Is this a suitable replacement? Thanks for the help, and I will cover this repair completely in this thread for the next guy/gal to use... paul Last edited by poopydoopynoopy; 24th February 2010 at 06:14 PM.

24th February 2010, 06:51 PM	#2
Perry Babin diyAudio Member Join Date: Nov 2003 Location: Louisiana	Those are likely a good choice. CD makes good quality capacitors. __________________ Links >> Basic Car Audio Amp Repair --- Basic Car Audio Electronics --- Basic Transistor Testing --- Basic Switching Power Supply Design --- Basic Computer Skills << Links

27th February 2010, 10:31 PM	#4
poopydoopynoopy diyAudio Member Join Date: Oct 2008 Location: 97220	buying more parts... Is THIS ok to use instead of a1266? This is my first car amp btw... paul

27th February 2010, 10:59 PM	#5
Perry Babin diyAudio Member Join Date: Nov 2003 Location: Louisiana	Those should work. Replace both drivers (Q741 and Q751). __________________ Links >> Basic Car Audio Amp Repair --- Basic Car Audio Electronics --- Basic Transistor Testing --- Basic Switching Power Supply Design --- Basic Computer Skills << Links

2nd March 2010, 12:25 PM	#7
Glowbug diyAudio Member Join Date: Feb 2006 Location: Hillsborough, NC/McLean, VA	I remember installing a few of those for my friends in high school (around '03). Great value for a used amp __________________ Jim J.


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24th February 2010, 07:32 PM	#3
poopydoopynoopy diyAudio Member Join Date: Oct 2008 Location: 97220	great, ordered! More to follow, Many thanks ! paul

27th February 2010, 11:07 PM	#6
poopydoopynoopy diyAudio Member Join Date: Oct 2008 Location: 97220	was my plan They both give 108 ohms...

2nd March 2010, 03:16 PM	#8
poopydoopynoopy diyAudio Member Join Date: Oct 2008 Location: 97220	I bought this one for $200 new in 2000 from an online discounter by the name of Yoshi. It happily ran 2 alpine r's until 2005 when I quite accidentally turned it on with shorted speaker wire. The smoke and fire was quite surprising, really. I tried to fix it once replacing only the power supply fet's. I did not fully understand the cause and effect associated with these types of failures. You can guess what happened when I powered it up. So now I have all the info and am doing all the testing and we shall see what happens this time.

5th March 2010, 03:10 AM	#9
poopydoopynoopy diyAudio Member Join Date: Oct 2008 Location: 97220	Ok. I have the amp stripped of all fet's power and output. Also have filter caps out and tl494 + 1266 drivers out. Amp powers up fine. Installed new filter caps, now it goes into protect. Rectifiers are in, test good, and were never removed. All FET's/494/1266's are still out. Normal? paul

5th March 2010, 03:38 AM	#10
Perry Babin diyAudio Member Join Date: Nov 2003 Location: Louisiana	Looking at the schematic diagram, it would appear that this is normal. Initially, the red LED is lit. It is driven off when the 494 begins to produce output. __________________ 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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