Tascam MS-16 diode
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My Tascam MS-16 seems to have the zener diode problem perfectly
described in this post:
http://groups.google.com/groups?selm...0newsbf02.news
..aol...
I'd like to replace the diode to see if that fixes the problem,
but I
don't have a service manual yet. Does anyone have a manual for
sale,
or know someplace that will sell one? Otherwise, if there are
other
MS-16 owners who already know the proper diode value (for R15,
with a
marking of 1961R) I'd love a little advice if you can spare it!
I've
searched the web for that marking and come up empty. That may
very
well be due to my lack of skill and familiarity with electronics.
Thanks for any help or leads you can provide!
-Chris
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JP Gerard View profile
More options Jan 14 2007, 10:50 am
Newsgroups: rec.audio.pro
From: "JP Gerard" jpgerard@skynet
Date: Wed, 14 Jan 2007 17:51:03 +0100
Local: Wed, Jan 14 2007 10:51 am
Subject: Tascam MS-16 diode prob. (?)
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D15: EQA01-09R 9V Zener Tascam P/N 5143174000
Unless K2 is activated, you're safe. Half of K2 closes the erase
head
circuit (one side of the relay to erase head neg. terminal, one
side to
ground) so unless it's closed, you can't have any current flowing
through
the erase head.
After I replaced all the relays with Omrons, no more funky
erasure...
But if the circuit driving the relay starts acting funky, it can
indeed be a
problem.
After about 10 years, you should consider replacing all the parts
that are
prone to aging issues.
I recapped the whole tyhing which took a lot of time and sweat,
but it was
worth it.
I'm now going to remove all the cards again and float those
Zeners above the
PCB surface, thanks for the tip!
JP
"Chris Lynch" a écrit dans le message
de news:
...
My Tascam MS-16 seems to have the zener diode problem perfectly
described in this post:
http://groups.google.com/groups?selm...0newsbf02.news
..aol...
tput=gplain
- Hide quoted text -
- Show quoted text -
I'd like to replace the diode to see if that fixes the problem,
but I
don't have a service manual yet. Does anyone have a manual for
sale,
or know someplace that will sell one? Otherwise, if there are
other
MS-16 owners who already know the proper diode value (for R15,
with a
marking of 1961R) I'd love a little advice if you can spare it!
I've
searched the web for that marking and come up empty. That may
very
well be due to my lack of skill and familiarity with
electronics.
Thanks for any help or leads you can provide!
-Chris
Reply Reply to author Forward Rate this post:
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JP Gerard View profile
More options Jan 14 2007, 10:52 am
Newsgroups: rec.audio.pro
From: "JP Gerard" jpgerard@skynet
Date: Wed, 14 Jan 2007 17:54:41 +0100
Local: Wed, Jan 14 2007 10:54 am
Subject: Tascam MS-16 diode prob. (?)
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Ah, the schemo says 19V Zener...
Must be a 9V though, the rail is 15V!
JP
"JP Gerard" jpgerard@skynet a écrit dans le message de news:
....
- Hide quoted text -
- Show quoted text -
D15: EQA01-09R 9V Zener Tascam P/N 5143174000
Unless K2 is activated, you're safe. Half of K2 closes the
erase head
circuit (one side of the relay to erase head neg. terminal, one
side to
ground) so unless it's closed, you can't have any current
flowing through
the erase head.
After I replaced all the relays with Omrons, no more funky
erasure...
But if the circuit driving the relay starts acting funky, it
can indeed be
a
problem.
After about 10 years, you should consider replacing all the
parts that are
prone to aging issues.
I recapped the whole tyhing which took a lot of time and sweat,
but it was
worth it.
I'm now going to remove all the cards again and float those
Zeners above
the
PCB surface, thanks for the tip!
JP
"Chris Lynch" a écrit dans le
message de news:
...
My Tascam MS-16 seems to have the zener diode problem
perfectly
described in this post:
http://groups.google.com/groups?selm...0newsbf02.news
..aol...
- Hide quoted text -
- Show quoted text -
tput=gplain
I'd like to replace the diode to see if that fixes the
problem, but I
don't have a service manual yet. Does anyone have a manual
for sale,
or know someplace that will sell one? Otherwise, if there
are other
MS-16 owners who already know the proper diode value (for
R15, with a
marking of 1961R) I'd love a little advice if you can spare
it! I've
searched the web for that marking and come up empty. That
may very
well be due to my lack of skill and familiarity with
electronics.
Thanks for any help or leads you can provide!
-Chris
Reply Reply to author Forward Rate this post:
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JP Gerard View profile
More options Jan 14 2007, 11:18 am
Newsgroups: rec.audio.pro
From: "JP Gerard" jpgerard@skynet
Date: Wed, 14 Jan 2007 18:20:30 +0100
Local: Wed, Jan 14 2007 11:20 am
Subject: Tascam MS-16 diode prob. (?)
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And the D15 diodes in my MS16 are marked:
19 - 61R
The 6V Zeners are marked:
06 - 61R
So... Is D15 a 19V zener after all?
Help?
JP
"JP Gerard" jpgerard@skynet a écrit dans le message de news:
...
- Hide quoted text -
- Show quoted text -
Ah, the schemo says 19V Zener...
Must be a 9V though, the rail is 15V!
JP
"JP Gerard" jpgerard@skynet a écrit dans le message de news:
....
D15: EQA01-09R 9V Zener Tascam P/N 5143174000
Unless K2 is activated, you're safe. Half of K2 closes the
erase head
circuit (one side of the relay to erase head neg. terminal,
one side to
ground) so unless it's closed, you can't have any current
flowing
through
the erase head.
After I replaced all the relays with Omrons, no more funky
erasure...
But if the circuit driving the relay starts acting funky, it
can indeed
be
a
problem.
After about 10 years, you should consider replacing all the
parts that
are
prone to aging issues.
I recapped the whole tyhing which took a lot of time and
sweat, but it
was
worth it.
I'm now going to remove all the cards again and float those
Zeners above
the
PCB surface, thanks for the tip!
JP
"Chris Lynch" a écrit dans le
message de
news:
...
My Tascam MS-16 seems to have the zener diode problem
perfectly
described in this post:
http://groups.google.com/groups?selm...0newsbf02.news
..aol...
- Hide quoted text -
- Show quoted text -
tput=gplain
I'd like to replace the diode to see if that fixes the
problem, but I
don't have a service manual yet. Does anyone have a manual
for sale,
or know someplace that will sell one? Otherwise, if there
are other
MS-16 owners who already know the proper diode value (for
R15, with a
marking of 1961R) I'd love a little advice if you can spare
it! I've
searched the web for that marking and come up empty. That
may very
well be due to my lack of skill and familiarity with
electronics.
Thanks for any help or leads you can provide!
-Chris
Reply Reply to author Forward Rate this post:
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Chris Lynch View profile
More options Jan 14 2007, 9:17 pm
Newsgroups: rec.audio.pro
From: (Chris Lynch)
Date: 14 Jan 2007 19:17:57 -0800
Local: Wed, Jan 14 2007 9:17 pm
Subject: Tascam MS-16 diode prob. (?)
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Hi JP,
That's great info, thanks! I'm really not sure how to test if
it's
the relays, so I figured it's cheaper to swap the diode first,
and if
it still erases I'll hit the relays next.
As for the voltage:
D15: EQA01-09R 9V Zener Tascam P/N 5143174000
....does that come from the service manual? If so, do we need to
worry
about the voltage as long as we get the right part#? I just
checked
jameco.com and mouser.com and I'm having no luck, and I can't
even
find components on tascam.com, so I clearly don't know what I'm
doing.
-Chris
- Hide quoted text -
- Show quoted text -
"JP Gerard" jpgerard@skynet wrote in message
.. .
And the D15 diodes in my MS16 are marked:
19 - 61R
The 6V Zeners are marked:
06 - 61R
So... Is D15 a 19V zener after all?
Help?
JP
"JP Gerard" jpgerard@skynet a écrit dans le message de news:
...
Ah, the schemo says 19V Zener...
Must be a 9V though, the rail is 15V!
JP
"JP Gerard" jpgerard@skynet a écrit dans le message de
news: ...
D15: EQA01-09R 9V Zener Tascam P/N 5143174000
Unless K2 is activated, you're safe. Half of K2 closes the
erase head
circuit (one side of the relay to erase head neg. terminal,
one side to
ground) so unless it's closed, you can't have any current
flowing
through
the erase head.
After I replaced all the relays with Omrons, no more funky
erasure...
But if the circuit driving the relay starts acting funky,
it can indeed
be
a
problem.
After about 10 years, you should consider replacing all the
parts that
are
prone to aging issues.
I recapped the whole tyhing which took a lot of time and
sweat, but it
was
worth it.
I'm now going to remove all the cards again and float those
Zeners above
the
PCB surface, thanks for the tip!
JP
"Chris Lynch" a écrit dans le
message de
news:
...
My Tascam MS-16 seems to have the zener diode problem
perfectly
described in this post:
http://groups.google.com/groups?selm...0newsbf02.news
..aol...
tput=gplain
I'd like to replace the diode to see if that fixes the
problem, but I
don't have a service manual yet. Does anyone have a
manual for sale,
or know someplace that will sell one? Otherwise, if
there are other
MS-16 owners who already know the proper diode value (for
R15, with a
marking of 1961R) I'd love a little advice if you can
spare it! I've
searched the web for that marking and come up empty.
That may very
well be due to my lack of skill and familiarity with
electronics.
Thanks for any help or leads you can provide!
-Chris
Reply Reply to author Forward Rate this post:
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JP Gerard View profile
More options Jan 15 2007, 10:19 am
Newsgroups: rec.audio.pro
From: "JP Gerard" jpgerard@skynet
Date: Thu, 15 Jan 2007 17:21:45 +0100
Local: Thurs, Jan 15 2007 10:21 am
Subject: Tascam MS-16 diode prob. (?)
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That's great info, thanks! I'm really not sure how to test if
it's
the relays, so I figured it's cheaper to swap the diode first,
and if
it still erases I'll hit the relays next.
Absolutely, actually I'm looking forward to having all the D15
replaced.
Having a hard time finding high dissipation 19V Zener diodes
though... up to
18, no prob, then it's 20, 22, 24V etc. It's a reference voltage
so it has
to be a 19V zener for proper operation.
As for the voltage:
D15: EQA01-09R 9V Zener Tascam P/N 5143174000
...does that come from the service manual? If so, do we need
to worry
about the voltage as long as we get the right part#? I just
checked
jameco.com and mouser.com and I'm having no luck, and I can't
even
find components on tascam.com, so I clearly don't know what I'm
doing.
-Chris
Sure, you should order a copy from Tascam. I got my MS16 in shape
but
without the manual it would've taken so much guess work...
Ordering the part from tascam is a solution, but I usually overdo
things and
I'm thinking about a 5W Zener here... why not?
Call your local Tascam rep., if I was able to ask my local rep.
(I'm in
Belgium) about parts for my 38 and my MS16, you should be able to
as well.
JP
"JP Gerard" jpgerard@skynet wrote in message
.. .
- Hide quoted text -
- Show quoted text -
And the D15 diodes in my MS16 are marked:
19 - 61R
The 6V Zeners are marked:
06 - 61R
So... Is D15 a 19V zener after all?
Help?
JP
"JP Gerard" jpgerard@skynet a écrit dans le message de
news:
...
Ah, the schemo says 19V Zener...
Must be a 9V though, the rail is 15V!
JP
"JP Gerard" jpgerard@skynet a écrit dans le message de
news: ...
D15: EQA01-09R 9V Zener Tascam P/N 5143174000
Unless K2 is activated, you're safe. Half of K2 closes
the erase
head
circuit (one side of the relay to erase head neg.
terminal, one side
to
ground) so unless it's closed, you can't have any current
flowing
through
the erase head.
After I replaced all the relays with Omrons, no more
funky
erasure...
But if the circuit driving the relay starts acting funky,
it can
indeed
be
a
problem.
After about 10 years, you should consider replacing all
the parts
that
are
prone to aging issues.
I recapped the whole tyhing which took a lot of time and
sweat, but
it
was
worth it.
I'm now going to remove all the cards again and float
those Zeners
above
the
PCB surface, thanks for the tip!
JP
"Chris Lynch" a écrit dans le
message de
news:
...
My Tascam MS-16 seems to have the zener diode problem
perfectly
described in this post:
http://groups.google.com/groups?selm...0newsbf02.news
..aol...
- Hide quoted text -
- Show quoted text -
tput=gplain
I'd like to replace the diode to see if that fixes the
problem,
but I
don't have a service manual yet. Does anyone have a
manual for
sale,
or know someplace that will sell one? Otherwise, if
there are
other
MS-16 owners who already know the proper diode value
(for R15,
with a
marking of 1961R) I'd love a little advice if you can
spare it!
I've
searched the web for that marking and come up empty.
That may
very
well be due to my lack of skill and familiarity with
electronics.
Thanks for any help or leads you can provide!
-Chris
Reply Reply to author Forward Rate this post:
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Justin Ulysses Morse View profile
JP Gerard jpgerard@skynet wrote: Absolutely, actually I'm
looking forward to having all the D15 replaced. Having a hard
time finding high dissipation 19V Zener diodes though... up to
18, no prob, then it's 20, 22, 24V etc. It's a reference voltage
so it has to be a 19V zener for proper operation. As for
the voltage: D15: EQA01-09R 9V Zener Tascam P/N
5143174000 ...does that come from the service manual? If so,
do we need to worry about the voltage as long as we get the
right part#? Sure, you should order a copy from Tascam. I got
my MS16 in shape but without the manual it would've taken so
much guess work... Ordering the part from tascam is a solution,
but I usually overdo things and I'm thinking about a 5W Zener
here... why not? Call your local Tascam rep., if I was able to
ask my local rep. (I'm in Belgium) about parts for my 38 and my
MS16, you should be able to as well. You should look for a
replacement zener that has the same package size and the same
power rating as the original. The same package size will assure
that it'll still fit on the circuitboard, and the same power
rating will assure that the voltage is spot on. Zener voltage is
specified at some particular reference current, and larger diodes
would presumably have a higher reference current. So using a 5W
zener in place of a 0.5W zener could, theoretically, have some
impact on the effective reference voltage. I don't know the
circuit you're dealing with so I don't know how important it is.
Digi-Key lists 19V zeners in DO-35 (0.5W), DO-41 (2W), and T-18
(5W) packages I would bet you want the DO-41. It's Digikey part
# 2EZ19D5MSCT-ND and they cost $0.75 apiece. ulysses - Hide
quoted text -- Show quoted text -
More options Jan 16 2007, 12:40 am
Newsgroups: rec.audio.pro
From: Justin Ulysses Morse
Date: Fri, 16 Jan 2007 00:40:46 -0600
Local: Fri, Jan 16 2007 12:40 am
Subject: Tascam MS-16 diode prob. (?)
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- Hide quoted text -
- Show quoted text -
JP Gerard jpgerard@skynet wrote:
Absolutely, actually I'm looking forward to having all the D15
replaced.
Having a hard time finding high dissipation 19V Zener diodes
though... up to
18, no prob, then it's 20, 22, 24V etc. It's a reference
voltage so it has
to be a 19V zener for proper operation.
As for the voltage:
D15: EQA01-09R 9V Zener Tascam P/N 5143174000
...does that come from the service manual? If so, do we need
to worry
about the voltage as long as we get the right part#?
Sure, you should order a copy from Tascam. I got my MS16 in
shape but
without the manual it would've taken so much guess work...
Ordering the part from tascam is a solution, but I usually
overdo things and
I'm thinking about a 5W Zener here... why not?
Call your local Tascam rep., if I was able to ask my local rep.
(I'm in
Belgium) about parts for my 38 and my MS16, you should be able
to as well.
You should look for a replacement zener that has the same package
size
and the same power rating as the original. The same package size
will
assure that it'll still fit on the circuitboard, and the same
power
rating will assure that the voltage is spot on. Zener voltage is
specified at some particular reference current, and larger diodes
would
presumably have a higher reference current. So using a 5W zener
in
place of a 0.5W zener could, theoretically, have some impact on
the
effective reference voltage. I don't know the circuit you're
dealing
with so I don't know how important it is.
Digi-Key lists 19V zeners in DO-35 (0.5W), DO-41 (2W), and T-18
(5W)
packages I would bet you want the DO-41. It's Digikey part #
2EZ19D5MSCT-ND and they cost $0.75 apiece.
ulysses
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JP Gerard View profile
More options Jan 16 2007, 4:12 am
Newsgroups: rec.audio.pro
From: "JP Gerard" jpgerard@skynet
Date: Fri, 16 Jan 2007 11:14:14 +0100
Local: Fri, Jan 16 2007 4:14 am
Subject: Tascam MS-16 diode prob. (?)
Reply to author | Forward | Print | Individual message | Show
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You should look for a replacement zener that has the same
package size
and the same power rating as the original. The same package
size will
assure that it'll still fit on the circuitboard, and the same
power
rating will assure that the voltage is spot on. Zener voltage
is
specified at some particular reference current, and larger
diodes would
presumably have a higher reference current. So using a 5W
zener in
place of a 0.5W zener could, theoretically, have some impact on
the
effective reference voltage. I don't know the circuit you're
dealing
with so I don't know how important it is.
But wouldn't you expect the manufaturer specified Zener V to be
spot on,
regardless of the power rating?
But sure, a 2W would probably be plenty. I'm still trying to find
the
original diode's power rating though.
The diode will be floating about 1/2" off the PCB so size is not
too
important.
Digi-Key lists 19V zeners in DO-35 (0.5W), DO-41 (2W), and T-18
(5W)
packages I would bet you want the DO-41. It's Digikey part #
2EZ19D5MSCT-ND and they cost $0.75 apiece.
Cool, thanks!
JP
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JP Gerard View profile
More options Jan 16 2007, 9:33 am
Newsgroups: rec.audio.pro
From: "JP Gerard" jpgerard@skynet
Date: Fri, 16 Jan 2007 16:35:41 +0100
Local: Fri, Jan 16 2007 9:35 am
Subject: Tascam MS-16 diode prob. (?)
Reply to author | Forward | Print | Individual message | Show
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And I was just told by my local rep. that a 3W Zener floating
around 1/2"
from the board will work well.
I'm definitely doing the mod ASAP.
JP
"Chris Lynch" a écrit dans le message
de news:
...
- Hide quoted text -
- Show quoted text -
Hi JP,
That's great info, thanks! I'm really not sure how to test if
it's
the relays, so I figured it's cheaper to swap the diode first,
and if
it still erases I'll hit the relays next.
As for the voltage:
D15: EQA01-09R 9V Zener Tascam P/N 5143174000
...does that come from the service manual? If so, do we need
to worry
about the voltage as long as we get the right part#? I just
checked
jameco.com and mouser.com and I'm having no luck, and I can't
even
find components on tascam.com, so I clearly don't know what I'm
doing.
-Chris
"JP Gerard" jpgerard@skynet wrote in message
.. .
- Hide quoted text -
- Show quoted text -
And the D15 diodes in my MS16 are marked:
19 - 61R
The 6V Zeners are marked:
06 - 61R
So... Is D15 a 19V zener after all?
Help?
JP
"JP Gerard" jpgerard@skynet a écrit dans le message de
news:
...
Ah, the schemo says 19V Zener...
Must be a 9V though, the rail is 15V!
JP
"JP Gerard" jpgerard@skynet a écrit dans le message de
news: ...
D15: EQA01-09R 9V Zener Tascam P/N 5143174000
Unless K2 is activated, you're safe. Half of K2 closes
the erase
head
circuit (one side of the relay to erase head neg.
terminal, one side
to
ground) so unless it's closed, you can't have any current
flowing
through
the erase head.
After I replaced all the relays with Omrons, no more
funky
erasure...
But if the circuit driving the relay starts acting funky,
it can
indeed
be
a
problem.
After about 10 years, you should consider replacing all
the parts
that
are
prone to aging issues.
I recapped the whole tyhing which took a lot of time and
sweat, but
it
was
worth it.
I'm now going to remove all the cards again and float
those Zeners
above
the
PCB surface, thanks for the tip!
JP
"Chris Lynch" a écrit dans le
message de
news:
...
My Tascam MS-16 seems to have the zener diode problem
perfectly
described in this post:
http://groups.google.com/groups?selm...0newsbf02.news
..aol...
- Hide quoted text -
- Show quoted text -
tput=gplain
I'd like to replace the diode to see if that fixes the
problem,
but I
don't have a service manual yet. Does anyone have a
manual for
sale,
or know someplace that will sell one? Otherwise, if
there are
other
MS-16 owners who already know the proper diode value
(for R15,
with a
marking of 1961R) I'd love a little advice if you can
spare it!
I've
searched the web for that marking and come up empty.
That may
very
well be due to my lack of skill and familiarity with
electronics.
Thanks for any help or leads you can provide!
-Chris
Reply Reply to author Forward Rate this post:
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JP Gerard View profile
More options Jan 16 2007, 9:34 am
Newsgroups: rec.audio.pro
From: "JP Gerard" jpgerard@skynet
Date: Fri, 16 Jan 2007 16:37:01 +0100
Local: Fri, Jan 16 2007 9:37 am
Subject: Tascam MS-16 diode prob. (?)
Reply to author | Forward | Print | Individual message | Show
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Ahem, meant a 20V 3W Zener...
But 19V will work too, of course...
JP
"JP Gerard" jpgerard@skynet a écrit dans le message de news:
...
- Hide quoted text -
- Show quoted text -
And I was just told by my local rep. that a 3W Zener floating
around 1/2"
from the board will work well.
I'm definitely doing the mod ASAP.
JP
"Chris Lynch" a écrit dans le
message de news:
...
Hi JP,
That's great info, thanks! I'm really not sure how to test
if it's
the relays, so I figured it's cheaper to swap the diode
first, and if
it still erases I'll hit the relays next.
As for the voltage:
D15: EQA01-09R 9V Zener Tascam P/N 5143174000
...does that come from the service manual? If so, do we need
to worry
about the voltage as long as we get the right part#? I just
checked
jameco.com and mouser.com and I'm having no luck, and I can't
even
find components on tascam.com, so I clearly don't know what
I'm doing.
-Chris
"JP Gerard" jpgerard@skynet wrote in message
.. .
And the D15 diodes in my MS16 are marked:
19 - 61R
The 6V Zeners are marked:
06 - 61R
So... Is D15 a 19V zener after all?
Help?
JP
"JP Gerard" jpgerard@skynet a écrit dans le message de
news:
...
Ah, the schemo says 19V Zener...
Must be a 9V though, the rail is 15V!
JP
"JP Gerard" jpgerard@skynet a écrit dans le message de
news: ...
D15: EQA01-09R 9V Zener Tascam P/N 5143174000
Unless K2 is activated, you're safe. Half of K2 closes
the erase
head
circuit (one side of the relay to erase head neg.
terminal, one
side
to
ground) so unless it's closed, you can't have any
current flowing
through
the erase head.
After I replaced all the relays with Omrons, no more
funky
erasure...
But if the circuit driving the relay starts acting
funky, it can
indeed
be
a
problem.
After about 10 years, you should consider replacing all
the parts
that
are
prone to aging issues.
I recapped the whole tyhing which took a lot of time
and sweat,
but
it
was
worth it.
I'm now going to remove all the cards again and float
those Zeners
above
the
PCB surface, thanks for the tip!
JP
"Chris Lynch" a écrit dans
le message
de
news:
...
My Tascam MS-16 seems to have the zener diode problem
perfectly
described in this post:
http://groups.google.com/groups?selm...0newsbf02.news
..aol...
- Hide quoted text -
- Show quoted text -
tput=gplain
I'd like to replace the diode to see if that fixes
the problem,
but I
don't have a service manual yet. Does anyone have a
manual for
sale,
or know someplace that will sell one? Otherwise, if
there are
other
MS-16 owners who already know the proper diode value
(for R15,
with a
marking of 1961R) I'd love a little advice if you can
spare it!
I've
searched the web for that marking and come up empty.
That may
very
well be due to my lack of skill and familiarity with
electronics.
Thanks for any help or leads you can provide!
-Chris
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Discussion subject changed to "Tascam MS-16 diodes found, still
need gas relays" by Chris Lynch
Chris Lynch View profile
More options Jan 16 2007, 11:49 am
Newsgroups: rec.audio.pro
From: (Chris Lynch)
Date: 16 Jan 2007 09:49:40 -0800
Local: Fri, Jan 16 2007 11:49 am
Subject: Tascam MS-16 diodes found, still need gas relays
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I finally found out how to contact Tascam after fumbling around
their
website for a while, here's the info:
Mark V Electronics, Inc. ,
8019 E. Slauson Avenue , Montebello, CA 90640 , ,
http://www.markvelectronics.com , Tel: 800-423-FIVE (orders
outside Canada) , 800-521-MARK (orders in Canada) , 213-888-8988
(catalog/info) Fax: 213-888-6868 ,
They responded to my e-mail with this:
"The diodes, part number 5224544601, is available at $.55 cents
each.
The relays, p/n 5290010400, is available at $13.40 each. Please
add $4
for postage/freight per order for UPS ground service within
CONTINENTAL USA plus local and state sales taxes where
applicable.
Prices quoted are only for SHIPMENT WITHIN THE U.S. or its
territories."
I bought the diodes and a service manual and the whole thing is
around
$60 USD from Tascam because I just don't trust myself to use a
different diode, and this'll just be easier. I asked if those
relays
were the gas filled ones, but he didn't think so. Where would I
find
those? Note that the diode part number has changed.
Thanks for all the info, and I hope this helps!
-Chris
- Hide quoted text -
- Show quoted text -
"JP Gerard" jpgerard@skynet wrote in message
...
You should look for a replacement zener that has the same
package size
and the same power rating as the original. The same package
size will
assure that it'll still fit on the circuitboard, and the same
power
rating will assure that the voltage is spot on. Zener
voltage is
specified at some particular reference current, and larger
diodes would
presumably have a higher reference current. So using a 5W
zener in
place of a 0.5W zener could, theoretically, have some impact
on the
effective reference voltage. I don't know the circuit you're
dealing
with so I don't know how important it is.
But wouldn't you expect the manufaturer specified Zener V to be
spot on,
regardless of the power rating?
But sure, a 2W would probably be plenty. I'm still trying to
find the
original diode's power rating though.
The diode will be floating about 1/2" off the PCB so size is
not too
important.
Digi-Key lists 19V zeners in DO-35 (0.5W), DO-41 (2W), and
T-18 (5W)
packages I would bet you want the DO-41. It's Digikey part
#
2EZ19D5MSCT-ND and they cost $0.75 apiece.
Cool, thanks!
JP
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JP Gerard View profile
More options Jan 16 2007, 12:11 pm
Newsgroups: rec.audio.pro
From: "JP Gerard" jpgerard@skynet
Date: Fri, 16 Jan 2007 19:13:51 +0100
Local: Fri, Jan 16 2007 12:13 pm
Subject: Tascam MS-16 diodes found, still need gas relays
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"The diodes, part number 5224544601, is available at $.55 cents
each.
The relays, p/n 5290010400, is available at $13.40 each. Please
add $4
for postage/freight per order for UPS ground service within
CONTINENTAL USA plus local and state sales taxes where
applicable.
Prices quoted are only for SHIPMENT WITHIN THE U.S. or its
territories."
Wow, buy Omron Relays, they're cheaper and much better.
I bought the diodes and a service manual and the whole thing is
around
$60 USD from Tascam because I just don't trust myself to use a
different diode, and this'll just be easier. I asked if those
relays
were the gas filled ones, but he didn't think so. Where would
I find
those? Note that the diode part number has changed.
Sounds about right.
You'll learn a LOT from that manual.
The big electronics parts suppliers will have 24V Relays in
stock, no prob.
Thanks for all the info, and I hope this helps!
-Chris
Hey, thanks for pointig out the problem.
I'll do the mod next week and keep you posted, but I don't expect
anything
spectacular.
Just solid, reliable operation would be good...
JP
"JP Gerard" jpgerard@skynet wrote in message
...
- Hide quoted text -
- Show quoted text -
You should look for a replacement zener that has the same
package size
and the same power rating as the original. The same
package size will
assure that it'll still fit on the circuitboard, and the
same power
rating will assure that the voltage is spot on. Zener
voltage is
specified at some particular reference current, and larger
diodes
would
presumably have a higher reference current. So using a 5W
zener in
place of a 0.5W zener could, theoretically, have some
impact on the
effective reference voltage. I don't know the circuit
you're dealing
with so I don't know how important it is.
But wouldn't you expect the manufaturer specified Zener V to
be spot on,
regardless of the power rating?
But sure, a 2W would probably be plenty. I'm still trying to
find the
original diode's power rating though.
The diode will be floating about 1/2" off the PCB so size is
not too
important.
Digi-Key lists 19V zeners in DO-35 (0.5W), DO-41 (2W), and
T-18 (5W)
packages I would bet you want the DO-41. It's Digikey
part #
2EZ19D5MSCT-ND and they cost $0.75 apiece.
Cool, thanks!
JP
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Discussion subject changed to "Tascam MS-16 diode prob. (?)" by
Justin Ulysses Morse
Justin Ulysses Morse View profile
More options Jan 16 2007, 4:59 pm
Newsgroups: rec.audio.pro
From: Justin Ulysses Morse
Date: Fri, 16 Jan 2007 16:59:06 -0600
Local: Fri, Jan 16 2007 4:59 pm
Subject: Tascam MS-16 diode prob. (?)
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JP Gerard jpgerard@skynet wrote:
But wouldn't you expect the manufaturer specified Zener V to be
spot on,
regardless of the power rating?
It'll only be spot-on if it has the specified amount of current
going
through it. It'll probably be very close anyway though.
But sure, a 2W would probably be plenty. I'm still trying to
find the
original diode's power rating though.
The diode will be floating about 1/2" off the PCB so size is
not too
important.
It's the length that you have to look at. A DO-35 package uses a
pin
spacing of 0.3" while a DO-41 package uses 0.4". Those 5W T-18
packages are probably longer. You can pretty much tell the power
rating by the package size, too. 500mW zeners are in a DO-35
package
while 2W zeners are DO-41. So measure the pin spacing on the
circuitboard and you'll know which diode to order.
ulysses
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Discussion subject changed to "Tascam MS-16 diodes found, still
need gas relays" by Scott Dorsey
Scott Dorsey View profile
Chris Lynch wrote: "The diodes, part
number 5224544601, is available at $.55 cents each. The relays,
p/n 5290010400, is available at $13.40 each. Please add $4 for
postage/freight per order for UPS ground service within
CONTINENTAL USA plus local and state sales taxes where
applicable. Prices quoted are only for SHIPMENT WITHIN THE U.S.
or its territories." Don't use the original replacement relays!
They will just go bad again... I think there is an Omron in the
Digi-Key catalogue with gold contacts and an identical pinout.
--scott -- "C'est un Nagra. C'est suisse, et tres, tres precis."
More options Jan 19 2007, 9:32 pm
Newsgroups: rec.audio.pro
From: (Scott Dorsey)
Date: 19 Jan 2007 22:32:19 -0500
Local: Mon, Jan 19 2007 9:32 pm
Subject: Tascam MS-16 diodes found, still need gas relays
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original | Report this message | Find messages by this author
Chris Lynch wrote:
"The diodes, part number 5224544601, is available at $.55 cents
each.
The relays, p/n 5290010400, is available at $13.40 each. Please
add $4
for postage/freight per order for UPS ground service within
CONTINENTAL USA plus local and state sales taxes where
applicable.
Prices quoted are only for SHIPMENT WITHIN THE U.S. or its
territories."
Don't use the original replacement relays! They will just go bad
again...
I think there is an Omron in the Digi-Key catalogue with gold
contacts and
an identical pinout.
--scott
--
"C'est un Nagra. C'est suisse, et tres, tres precis."
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JP Gerard View profile
So, I have 20V 5W Zeners in there and all is well. Works like it
should... but I need a good sessions with a bunch of punch ins to
really put it to the test. I know, 5W is overkill but that's all
I could get on short notice. So there, I think I replaced most
things now except resistors, coils, (most) ICs, transistors and
FETs. An IC upgrade is of course a possibility. Then no more
tweaking. Or perhaps I'll change the gain structure, I think
there's too much signal loss in the PB amps. Hmmm... JP
More options Jan 20 2007, 10:06 am
Newsgroups: rec.audio.pro
From: "JP Gerard" jpgerard@skynet
Date: Tue, 20 Jan 2007 17:08:31 +0100
Local: Tues, Jan 20 2007 10:08 am
Subject: Tascam MS-16 diodes found, still need gas relays
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So, I have 20V 5W Zeners in there and all is well.
Works like it should... but I need a good sessions with a bunch
of punch ins
to really put it to the test.
I know, 5W is overkill but that's all I could get on short
notice.
So there, I think I replaced most things now except resistors,
coils, (most)
ICs, transistors and FETs.
An IC upgrade is of course a possibility. Then no more tweaking.
Or perhaps I'll change the gain structure, I think there's too
much signal
loss in the PB amps.
Hmmm...
JP
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Chris Lynch View profile
More options Feb 18 2007, 2:10 pm
Newsgroups: rec.audio.pro
From: (Chris Lynch)
Date: 18 Feb 2007 12:10:05 -0800
Local: Wed, Feb 18 2007 2:10 pm
Subject: Tascam MS-16 diodes found, still need gas relays
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I'm afraid I don't know how to spec out a new relay. I've been
to
digikey, but there are thousands of Omron relays and I don't know
where to start! Do you have the digikey part number? Well, as
lame
as I am with electronics, I seem to have successfully fixed the
diode
problem, so thanks for everyone's help! Score one for the slow
guy!
-Chris
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