Zapco Z400c4-SL no power supply

fongman · 10th March 2010, 11:42 PM

Hi, guys. I just got this amp and was told that it was not working. I will try to fix it with everyone's help. I try powering it up and the fan is working and power light is on. I have no speacial plug that zapco used. So i'm not trying to get sound yet. But i open it up anyway. Big suprise to me, the power supply is missing. I'm stuck now. I need the schematic for this amp or where can i buy a new? I don't see anything burn or missing, only the power supply. Any help is thankfull.

Perry Babin · 11th March 2010, 01:02 AM

You should try contacting Zapco to see if they can supply a replacement. It's unlikely that they will but you should try that before you try to make one.

Have you tested the outputs to see if any were shorted. It may not seem important at this point but if the amp has a lot of other damage, it may not be worth the effort/expense to repair.

fongman · 11th March 2010, 01:11 AM

I will test them tonight.

fongman · 11th March 2010, 02:35 AM

All the outputs are ok.

Perry Babin · 11th March 2010, 02:42 AM

What's the voltage rating on the rail caps?

fongman · 11th March 2010, 05:29 AM

Without the power supply will i get a good reading?

Perry Babin · 11th March 2010, 05:33 AM

Read the numbers off of the side of the caps.

fongman · 11th March 2010, 05:39 AM

The 4 larger ones on the left are 4700uf 50v and the 5 smaller ones on the right are 4700uf 16v.

Perry Babin · 11th March 2010, 05:49 AM

Do you have any amplifiers that you could 'borrow' a transformer from?

It doesn't need to be anything special. I think it would be good to drop a transformer in it so that you could determine the condition of the amp before you spend any money on a new transformer.

Robcrx · 11th March 2010, 05:59 AM

contact robert@zapco.com
he usually answers quickly !

10th March 2010, 11:42 PM	#1
fongman diyAudio Member Join Date: Jan 2009	Zapco Z400c4-SL no power supply Hi, guys. I just got this amp and was told that it was not working. I will try to fix it with everyone's help. I try powering it up and the fan is working and power light is on. I have no speacial plug that zapco used. So i'm not trying to get sound yet. But i open it up anyway. Big suprise to me, the power supply is missing. I'm stuck now. I need the schematic for this amp or where can i buy a new? I don't see anything burn or missing, only the power supply. Any help is thankfull.

11th March 2010, 01:02 AM	#2
Perry Babin diyAudio Member Join Date: Nov 2003 Location: Louisiana	You should try contacting Zapco to see if they can supply a replacement. It's unlikely that they will but you should try that before you try to make one. Have you tested the outputs to see if any were shorted. It may not seem important at this point but if the amp has a lot of other damage, it may not be worth the effort/expense to repair. __________________ Links >> Basic Car Audio Amp Repair --- Basic Car Audio Electronics --- Basic Transistor Testing --- Basic Switching Power Supply Design --- Basic Computer Skills << Links

11th March 2010, 02:42 AM	#5
Perry Babin diyAudio Member Join Date: Nov 2003 Location: Louisiana	What's the voltage rating on the rail caps? __________________ Links >> Basic Car Audio Amp Repair --- Basic Car Audio Electronics --- Basic Transistor Testing --- Basic Switching Power Supply Design --- Basic Computer Skills << Links

11th March 2010, 05:33 AM	#7
Perry Babin diyAudio Member Join Date: Nov 2003 Location: Louisiana	Read the numbers off of the side of the caps. __________________ Links >> Basic Car Audio Amp Repair --- Basic Car Audio Electronics --- Basic Transistor Testing --- Basic Switching Power Supply Design --- Basic Computer Skills << Links

11th March 2010, 05:49 AM	#9
Perry Babin diyAudio Member Join Date: Nov 2003 Location: Louisiana	Do you have any amplifiers that you could 'borrow' a transformer from? It doesn't need to be anything special. I think it would be good to drop a transformer in it so that you could determine the condition of the amp before you spend any money on a new transformer. __________________ 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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11th March 2010, 01:11 AM	#3
fongman diyAudio Member Join Date: Jan 2009	I will test them tonight.

11th March 2010, 02:35 AM	#4
fongman diyAudio Member Join Date: Jan 2009	All the outputs are ok.

11th March 2010, 05:29 AM	#6
fongman diyAudio Member Join Date: Jan 2009	Without the power supply will i get a good reading?

11th March 2010, 05:39 AM	#8
fongman diyAudio Member Join Date: Jan 2009	The 4 larger ones on the left are 4700uf 50v and the 5 smaller ones on the right are 4700uf 16v.

11th March 2010, 05:59 AM	#10
Robcrx diyAudio Member Join Date: Feb 2009 Location: Toronto Canada	contact robert@zapco.com he usually answers quickly !

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