Hifonics Olympus VII

mike49504 · 24th February 2010, 04:34 AM

Perry,

Do you or does anyone know the value of theese resistors??

As you can tell they are badly burnt

Perry Babin · 24th February 2010, 04:54 AM

Probably 2.7 ohms.

mike49504 · 24th February 2010, 05:05 AM

Wondering if you know why theese things smoked ?? Is there a common problem or someone abused the amp?

Perry Babin · 24th February 2010, 05:19 AM

It's generally due to abuse but it can happen if there is an open shield ground in the amp or head unit.

1moreamp · 24th February 2010, 05:51 PM

Quote:

Originally Posted by Perry Babin

It's generally due to abuse but it can happen if there is an open shield ground in the amp or head unit.

I agree abuse. I have replaced hundreds of these resistors over the years. 2.7 ohms 2 watt, you can try 5 watt for durability reasons.

These like to toast up like this on extreme clipping situation like trunk bass. The open ground Perry mentioned would have ground loop noise so bad you would not be able to listen to it for more then 10 seconds without shutting it off. Unless the amp was connected to subs in a trunk where all you could hear would be muffled bass rattling the vehicle. Some folks will listen to anything you know...lol

gisewhcs · 26th February 2010, 11:53 AM

I saw those resistors burnt to ashes in several ZED-Amps from that era.
Most of them failed because of open signal grounds.

Nearly always the the ground pin was broken directly at the PCB, probably a manufacturing fault at those cinch connectors.
Check that by bending/twisting the connector a bit, because sometimes there was no open ground when I had the amp disassembled on my bench,
but reassembled with the sideplates on it, signal ground read open.

mike49504 · 3rd March 2010, 02:37 AM

I have a problem still with this amp if the board is out of the sink its idles perfect.

As soom as i put the board back into the sink and clamp stuff down it draws current. I have the insulator paper in place and its in good condition.

And when i was trying to figure out why i bump 1 of the side plated and it started sparking.

Any ides on whats causing this?

Perry Babin · 3rd March 2010, 03:15 AM

With the transistors tightly clamped to the heatsink, check for continuity from the center leg of the power semiconductors to the heatsink. They should all read OL.

mike49504 · 3rd March 2010, 03:23 AM

From the center leg of the 2sc2061's to the chasis of the amp reads a direct short.

Perry Babin · 3rd March 2010, 03:25 AM

The 2061 in the power supply?

24th February 2010, 04:54 AM	#2
Perry Babin diyAudio Member Join Date: Nov 2003 Location: Louisiana	Probably 2.7 ohms. __________________ Links >> Basic Car Audio Amp Repair --- Basic Car Audio Electronics --- Basic Transistor Testing --- Basic Switching Power Supply Design --- Basic Computer Skills << Links

24th February 2010, 05:19 AM	#4
Perry Babin diyAudio Member Join Date: Nov 2003 Location: Louisiana	It's generally due to abuse but it can happen if there is an open shield ground in the amp or head unit. __________________ Links >> Basic Car Audio Amp Repair --- Basic Car Audio Electronics --- Basic Transistor Testing --- Basic Switching Power Supply Design --- Basic Computer Skills << Links

3rd March 2010, 03:15 AM	#8
Perry Babin diyAudio Member Join Date: Nov 2003 Location: Louisiana	With the transistors tightly clamped to the heatsink, check for continuity from the center leg of the power semiconductors to the heatsink. They should all read OL. __________________ Links >> Basic Car Audio Amp Repair --- Basic Car Audio Electronics --- Basic Transistor Testing --- Basic Switching Power Supply Design --- Basic Computer Skills << Links

3rd March 2010, 03:25 AM	#10
Perry Babin diyAudio Member Join Date: Nov 2003 Location: Louisiana	The 2061 in the power supply? __________________ 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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24th February 2010, 05:05 AM	#3
mike49504 diyAudio Member Join Date: Sep 2006	Wondering if you know why theese things smoked ?? Is there a common problem or someone abused the amp?

26th February 2010, 11:53 AM	#6
gisewhcs diyAudio Member Join Date: Sep 2007	I saw those resistors burnt to ashes in several ZED-Amps from that era. Most of them failed because of open signal grounds. Nearly always the the ground pin was broken directly at the PCB, probably a manufacturing fault at those cinch connectors. Check that by bending/twisting the connector a bit, because sometimes there was no open ground when I had the amp disassembled on my bench, but reassembled with the sideplates on it, signal ground read open.

3rd March 2010, 02:37 AM	#7
mike49504 diyAudio Member Join Date: Sep 2006	I have a problem still with this amp if the board is out of the sink its idles perfect. As soom as i put the board back into the sink and clamp stuff down it draws current. I have the insulator paper in place and its in good condition. And when i was trying to figure out why i bump 1 of the side plated and it started sparking. Any ides on whats causing this?

3rd March 2010, 03:23 AM	#9
mike49504 diyAudio Member Join Date: Sep 2006	From the center leg of the 2sc2061's to the chasis of the amp reads a direct short.

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