Yamaha diode ID

B

BOB URZ

Guest
I have got a Yamaha EMX2000 in that had a fried channel.
Replaced all the outputs, then found a dam diode shorted.
I don't have the print yet, so would like a ID on the diode
if anyone has a service manual. Its on the main amp board,
position D220. It says on the diode:

10zRL
.86


It has a brown stripe on the end. Its fat like a 1 watter.
Ideas? Tried the NTE book, but no direct hits.

Bob




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"BOB URZ" <"sound(remove)"@inetnebr.com> wrote in message
news:40ABD4F1.9973C7B6@inetnebr.com...
I have got a Yamaha EMX2000 in that had a fried channel.
Replaced all the outputs, then found a dam diode shorted.
I don't have the print yet, so would like a ID on the diode
if anyone has a service manual. Its on the main amp board,
position D220. It says on the diode:

10zRL
.86


It has a brown stripe on the end. Its fat like a 1 watter.
Ideas? Tried the NTE book, but no direct hits.

Bob
Click to expand...
could it be an ultrafast recovery diode? see the RL 10Z
http://www.allegromicro.com/skncatlg/diode/diodes.pdf
 
Tim Perry wrote:
"BOB URZ" <"sound(remove)"@inetnebr.com> wrote in message
news:40ABD4F1.9973C7B6@inetnebr.com...

I have got a Yamaha EMX2000 in that had a fried channel.
Replaced all the outputs, then found a dam diode shorted.
I don't have the print yet, so would like a ID on the diode
if anyone has a service manual. Its on the main amp board,
position D220. It says on the diode:

10zRL
.86


It has a brown stripe on the end. Its fat like a 1 watter.
Ideas? Tried the NTE book, but no direct hits.

Bob




could it be an ultrafast recovery diode? see the RL 10Z
http://www.allegromicro.com/skncatlg/diode/diodes.pdf


I think your on the right track Tim, Thanks.
Click to expand...
It looks like a 2amp 200piv fast diode.
I am something close laying around i am going to
stick in and try.

Bob



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Bob Urz <sound@inetnebr.com> wrote:

Tim Perry wrote:
"BOB URZ" <"sound(remove)"@inetnebr.com> wrote in message
news:40ABD4F1.9973C7B6@inetnebr.com...

I have got a Yamaha EMX2000 in that had a fried channel.
Replaced all the outputs, then found a dam diode shorted.
I don't have the print yet, so would like a ID on the diode
if anyone has a service manual. Its on the main amp board,
position D220. It says on the diode:

10zRL
.86


It has a brown stripe on the end. Its fat like a 1 watter.
Ideas? Tried the NTE book, but no direct hits.

Bob




could it be an ultrafast recovery diode? see the RL 10Z
http://www.allegromicro.com/skncatlg/diode/diodes.pdf


I think your on the right track Tim, Thanks.
It looks like a 2amp 200piv fast diode.
I am something close laying around i am going to
stick in and try.

Bob
Click to expand...
I've used a regular 4 amp 400 piv diode in it's place. Worked OK.
---
Ing. Remberto Gomez-Meda <gomerem@hotmail.com>
http://ingemeda.tripod.com/
INGE - Ingenieria Electronica.
Puerto Vallarta, Jalisco, Mexico.
 
Basically If its a Black diode in the Powersupply
My Bet its a "1N2001" diode.
the diode would only short If too much current is being drawn from It...
Find out what caused it To short...

Neal
"El Meda" <gomerem@hotmail.com> wrote in message
news:sn2sa01nkir8u03njghijp2u1je6bg9qdi@4ax.com...
Bob Urz <sound@inetnebr.com> wrote:



Tim Perry wrote:
"BOB URZ" <"sound(remove)"@inetnebr.com> wrote in message
news:40ABD4F1.9973C7B6@inetnebr.com...

I have got a Yamaha EMX2000 in that had a fried channel.
Replaced all the outputs, then found a dam diode shorted.
I don't have the print yet, so would like a ID on the diode
if anyone has a service manual. Its on the main amp board,
position D220. It says on the diode:

10zRL
.86


It has a brown stripe on the end. Its fat like a 1 watter.
Ideas? Tried the NTE book, but no direct hits.

Bob




could it be an ultrafast recovery diode? see the RL 10Z
http://www.allegromicro.com/skncatlg/diode/diodes.pdf


I think your on the right track Tim, Thanks.
It looks like a 2amp 200piv fast diode.
I am something close laying around i am going to
stick in and try.

Bob

I've used a regular 4 amp 400 piv diode in it's place. Worked OK.
---
Ing. Remberto Gomez-Meda <gomerem@hotmail.com
http://ingemeda.tripod.com/
INGE - Ingenieria Electronica.
Puerto Vallarta, Jalisco, Mexico.
Click to expand...
 
Neal Newman wrote:

Basically If its a Black diode in the Powersupply
My Bet its a "1N2001" diode.
the diode would only short If too much current is being drawn from It...
Find out what caused it To short...

Neal
"El Meda" <gomerem@hotmail.com> wrote in message
news:sn2sa01nkir8u03njghijp2u1je6bg9qdi@4ax.com...
Bob Urz <sound@inetnebr.com> wrote:



Tim Perry wrote:
"BOB URZ" <"sound(remove)"@inetnebr.com> wrote in message
news:40ABD4F1.9973C7B6@inetnebr.com...

I have got a Yamaha EMX2000 in that had a fried channel.
Replaced all the outputs, then found a dam diode shorted.
I don't have the print yet, so would like a ID on the diode
if anyone has a service manual. Its on the main amp board,
position D220. It says on the diode:

10zRL
.86


It has a brown stripe on the end. Its fat like a 1 watter.
Ideas? Tried the NTE book, but no direct hits.

Bob




could it be an ultrafast recovery diode? see the RL 10Z
http://www.allegromicro.com/skncatlg/diode/diodes.pdf


I think your on the right track Tim, Thanks.
It looks like a 2amp 200piv fast diode.
I am something close laying around i am going to
stick in and try.

Bob

I've used a regular 4 amp 400 piv diode in it's place. Worked OK.
---
Ing. Remberto Gomez-Meda <gomerem@hotmail.com
http://ingemeda.tripod.com/
INGE - Ingenieria Electronica.
Puerto Vallarta, Jalisco, Mexico.
Click to expand...
No, it NOT in the power supply. Its off the collectors
of the output transistors. I don't have the print in yet,
and i don't think this is a traditional AB layout.


Bob
 
BOB URZ <"sound(remove)"@inetnebr.com> wrote:

No, it NOT in the power supply. Its off the collectors
of the output transistors. I don't have the print in yet,
and i don't think this is a traditional AB layout.
Click to expand...
It's not. The main amp power supply without signal applied is about
+8V and -5V and increases following the signal applied to a maximum of
+80V and -80V. Two power transistors more or less in parallel are used
to control each half of this variable power supply.

There are six similar looking diodes in each channel, two of them go
from the collectors of the power transistors of the main amp to GND.
The other 4 are connected 2 by 2 en series and are connected between
the collectors of each pair of power supply control power transistors.

I've used conventional 4A 400V diodes instead of all of them and they
have worked OK.
---
Ing. Remberto Gomez-Meda <gomerem@hotmail.com>
http://ingemeda.tripod.com/
INGE - Ingenieria Electronica.
Puerto Vallarta, Jalisco, Mexico.
 
El Meda wrote:

BOB URZ <"sound(remove)"@inetnebr.com> wrote:


No, it NOT in the power supply. Its off the collectors
of the output transistors. I don't have the print in yet,
and i don't think this is a traditional AB layout.

It's not. The main amp power supply without signal applied is about
+8V and -5V and increases following the signal applied to a maximum of
+80V and -80V. Two power transistors more or less in parallel are used
to control each half of this variable power supply.

There are six similar looking diodes in each channel, two of them go
from the collectors of the power transistors of the main amp to GND.
The other 4 are connected 2 by 2 en series and are connected between
the collectors of each pair of power supply control power transistors.

I've used conventional 4A 400V diodes instead of all of them and they
have worked OK.
---
Ing. Remberto Gomez-Meda <gomerem@hotmail.com
http://ingemeda.tripod.com/
INGE - Ingenieria Electronica.
Puerto Vallarta, Jalisco, Mexico.
Click to expand...
In this amp, there are only TWO of these diodes per channel.
d222,d221, and d122/d121. So there are four total on the amp board.
These are not the same as any of the other diodes on the board. They are
also bigger and have brown stripe and printing, where all the
other diodes have conventional grey/silver stripe and printing.
The board is listed as a XS318. I would think if these diodes are
involved in rail switching that they would need to be of the fast
variety for best results.

Bob.
 
BOB URZ <"sound(remove)"@inetnebr.com> wrote:


In this amp, there are only TWO of these diodes per channel.
d222,d221, and d122/d121. So there are four total on the amp board.
These are not the same as any of the other diodes on the board. They are
also bigger and have brown stripe and printing, where all the
other diodes have conventional grey/silver stripe and printing.
The board is listed as a XS318. I would think if these diodes are
involved in rail switching that they would need to be of the fast
variety for best results.

Bob.
Click to expand...
As this amp has only one power supply, they are not involved in rail
switching. They are probably the protection diodes connected between
the collectors of the main amp power transistors and GND, you can
check this with an ohmmeter.

Anyway if you can get the original parts, do it. Have you tried
directly with Yamaha?
---
Ing. Remberto Gomez-Meda <gomerem@hotmail.com>
http://ingemeda.tripod.com/
INGE - Ingenieria Electronica.
Puerto Vallarta, Jalisco, Mexico.
 
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