Crate amplifier problem

johnnystulic2004 · 7th May 2010, 12:47 PM

Hello everyone, I am new to this forum and I need help. Amplifier that has been bothering me Crate TX30E (taxi): Crate TX30E Taxi Yellow Battery-Powered Amplifier

It's about 8 years old, working at 12V, the battery has been changed once, it is in a good condition. The output is TDA1560Q, this chip has two modes: B class and H class. Up to 10W - B up to 30W - H . It also has built in ELCO capacitors and circuitry for increasing the voltage so it can get more power with only at 12 V. Speaker is 8 ohms, two-way.

Problem: when output power exceeds 10-15 w it starts distorting until power does not fall under some 7-8 W, then it goes back to normal operation ..
I have replaced the TDA1560Q but it is still the same. I resoldered all suspicious connections and checked all the diodes. All the capacitors look OK, and visually there are no suspicious places. No way to determine where is the problem...

If anyone has advice please help me because I'm a bit desperate. I was refused at the repair shop because they didn't want to deal with amplifier worth 200-300 euros). Too cheap for them but not for me....

Any help is appreciated!

firechief · 7th May 2010, 04:18 PM

Peliminary search for schematic, - no go. Are you willing to try contacting Crate for the schematic? Give it a try and report back.

llwhtt · 7th May 2010, 04:20 PM

I just requested a schematic from LOUD(Crate)and will try to help as soon as I get it. I assume that you do not have a schematic as you didn't mention it.

Craig

johnnystulic2004 · 7th May 2010, 04:50 PM

Thanks for your effort, I don't have schematics... I just remmoved capacitors (largest - 4700 uF). They seem to be OK. (resistance more than 20 Mohm, capacity I cannot measure but they seem OK....

llwhtt · 7th May 2010, 10:33 PM

I have the schematic now, what's your email.

Craig

firechief · 7th May 2010, 11:22 PM

llwhtt
Do you have a way to post the schematic? We can all learn together.

llwhtt · 7th May 2010, 11:28 PM

It's a PDF and too large.

Craig

Terry Demol · 8th May 2010, 01:05 AM

Quote:

Originally Posted by johnnystulic2004

Hello everyone, I am new to this forum and I need help. Amplifier that has been bothering me Crate TX30E (taxi): Crate TX30E Taxi Yellow Battery-Powered Amplifier

It's about 8 years old, working at 12V, the battery has been changed once, it is in a good condition. The output is TDA1560Q, this chip has two modes: B class and H class. Up to 10W - B up to 30W - H . It also has built in ELCO capacitors and circuitry for increasing the voltage so it can get more power with only at 12 V. Speaker is 8 ohms, two-way.

Problem: when output power exceeds 10-15 w it starts distorting until power does not fall under some 7-8 W, then it goes back to normal operation ..
I have replaced the TDA1560Q but it is still the same. I resoldered all suspicious connections and checked all the diodes. All the capacitors look OK, and visually there are no suspicious places. No way to determine where is the problem...

If anyone has advice please help me because I'm a bit desperate. I was refused at the repair shop because they didn't want to deal with amplifier worth 200-300 euros). Too cheap for them but not for me....

Any help is appreciated!

What equipment do you have?

T

llwhtt · 8th May 2010, 01:36 AM

Here's the schematic.

teemuk · 8th May 2010, 07:57 AM

Pin 16 of the output chip is a mode select used for selecting between standby, mute, class B and class H. Is it receiving the right input?

7th May 2010, 12:47 PM	#1
johnnystulic2004 diyAudio Member Join Date: May 2010	Crate amplifier problem Hello everyone, I am new to this forum and I need help. Amplifier that has been bothering me Crate TX30E (taxi): Crate TX30E Taxi Yellow Battery-Powered Amplifier It's about 8 years old, working at 12V, the battery has been changed once, it is in a good condition. The output is TDA1560Q, this chip has two modes: B class and H class. Up to 10W - B up to 30W - H . It also has built in ELCO capacitors and circuitry for increasing the voltage so it can get more power with only at 12 V. Speaker is 8 ohms, two-way. Problem: when output power exceeds 10-15 w it starts distorting until power does not fall under some 7-8 W, then it goes back to normal operation .. I have replaced the TDA1560Q but it is still the same. I resoldered all suspicious connections and checked all the diodes. All the capacitors look OK, and visually there are no suspicious places. No way to determine where is the problem... If anyone has advice please help me because I'm a bit desperate. I was refused at the repair shop because they didn't want to deal with amplifier worth 200-300 euros). Too cheap for them but not for me.... Any help is appreciated!

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7th May 2010, 04:18 PM	#2
firechief diyAudio Member Join Date: Sep 2008 Location: Near Seattle Wa	Peliminary search for schematic, - no go. Are you willing to try contacting Crate for the schematic? Give it a try and report back.

7th May 2010, 04:20 PM	#3
llwhtt diyAudio Member Join Date: Jun 2008	I just requested a schematic from LOUD(Crate)and will try to help as soon as I get it. I assume that you do not have a schematic as you didn't mention it. Craig

7th May 2010, 04:50 PM	#4
johnnystulic2004 diyAudio Member Join Date: May 2010	Thanks for your effort, I don't have schematics... I just remmoved capacitors (largest - 4700 uF). They seem to be OK. (resistance more than 20 Mohm, capacity I cannot measure but they seem OK....

7th May 2010, 10:33 PM	#5
llwhtt diyAudio Member Join Date: Jun 2008	I have the schematic now, what's your email. Craig

7th May 2010, 11:22 PM	#6
firechief diyAudio Member Join Date: Sep 2008 Location: Near Seattle Wa	llwhtt Do you have a way to post the schematic? We can all learn together.

7th May 2010, 11:28 PM	#7
llwhtt diyAudio Member Join Date: Jun 2008	It's a PDF and too large. Craig

8th May 2010, 07:57 AM	#10
teemuk diyAudio Member Join Date: Nov 2004 Location: Suomi, Finland	Pin 16 of the output chip is a mode select used for selecting between standby, mute, class B and class H. Is it receiving the right input?

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