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Tascam MS-16 diode
Tascam MS-16 diode
Reply to author | Forward | Print | Individual message | Show original | Report this message | Find messages by this author 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 Reply Reply to author Forward Rate this post: Text for clearing space You must Sign in before you can post messages. To post a message you must first join this group. Please update your nickname on the subscription settings page before posting. Please update your nickname on the subscription settings page before posting. 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. (?) Reply to author | Forward | Print | Individual message | Show original | Report this message | Find messages by this author 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: Text for clearing space You must Sign in before you can post messages. To post a message you must first join this group. Please update your nickname on the subscription settings page before posting. Please update your nickname on the subscription settings page before posting. 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. (?) Reply to author | Forward | Print | Individual message | Show original | Report this message | Find messages by this author 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: Text for clearing space You must Sign in before you can post messages. To post a message you must first join this group. Please update your nickname on the subscription settings page before posting. Please update your nickname on the subscription settings page before posting. 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. (?) Reply to author | Forward | Print | Individual message | Show original | Report this message | Find messages by this author 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: Text for clearing space You must Sign in before you can post messages. To post a message you must first join this group. Please update your nickname on the subscription settings page before posting. Please update your nickname on the subscription settings page before posting. 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. (?) Reply to author | Forward | Print | Individual message | Show original | Report this message | Find messages by this author 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: Text for clearing space You must Sign in before you can post messages. To post a message you must first join this group. Please update your nickname on the subscription settings page before posting. Please update your nickname on the subscription settings page before posting. 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. (?) Reply to author | Forward | Print | Individual message | Show original | Report this message | Find messages by this author 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: Text for clearing space You must Sign in before you can post messages. To post a message you must first join this group. Please update your nickname on the subscription settings page before posting. Please update your nickname on the subscription settings page before posting. 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. (?) Reply to author | Forward | Print | Individual message | Show original | Report this message | Find messages by this author - 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 Reply Reply to author Forward Rate this post: Text for clearing space You must Sign in before you can post messages. To post a message you must first join this group. Please update your nickname on the subscription settings page before posting. Please update your nickname on the subscription settings page before posting. 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 original | Report this message | Find messages by this author 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 Reply Reply to author Forward Rate this post: Text for clearing space You must Sign in before you can post messages. To post a message you must first join this group. Please update your nickname on the subscription settings page before posting. Please update your nickname on the subscription settings page before posting. 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 original | Report this message | Find messages by this author 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: Text for clearing space You must Sign in before you can post messages. To post a message you must first join this group. Please update your nickname on the subscription settings page before posting. Please update your nickname on the subscription settings page before posting. 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 original | Report this message | Find messages by this author 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 Reply Reply to author Forward Rate this post: Text for clearing space You must Sign in before you can post messages. To post a message you must first join this group. Please update your nickname on the subscription settings page before posting. Please update your nickname on the subscription settings page before posting. 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 Reply to author | Forward | Print | Individual message | Show original | Report this message | Find messages by this author 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 Reply Reply to author Forward Rate this post: Text for clearing space You must Sign in before you can post messages. To post a message you must first join this group. Please update your nickname on the subscription settings page before posting. Please update your nickname on the subscription settings page before posting. 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 Reply to author | Forward | Print | Individual message | Show original | Report this message | Find messages by this author "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 Reply Reply to author Forward Rate this post: Text for clearing space You must Sign in before you can post messages. To post a message you must first join this group. Please update your nickname on the subscription settings page before posting. Please update your nickname on the subscription settings page before posting. 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. (?) Reply to author | Forward | Print | Individual message | Show original | Report this message | Find messages by this author 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 Reply Reply to author Forward Rate this post: Text for clearing space You must Sign in before you can post messages. To post a message you must first join this group. Please update your nickname on the subscription settings page before posting. Please update your nickname on the subscription settings page before posting. 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 Reply to author | Forward | Print | Individual message | Show 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." Reply Reply to author Forward Rate this post: Text for clearing space You must Sign in before you can post messages. To post a message you must first join this group. Please update your nickname on the subscription settings page before posting. Please update your nickname on the subscription settings page before posting. 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 Reply to author | Forward | Print | Individual message | Show original | Report this message | Find messages by this author 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 Reply Reply to author Forward Rate this post: Text for clearing space You must Sign in before you can post messages. To post a message you must first join this group. Please update your nickname on the subscription settings page before posting. Please update your nickname on the subscription settings page before posting. 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 Reply to author | Forward | Print | Individual message | Show original | Report this message | Find messages by this author 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 - Hide quoted text - - Show quoted text - |
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Tascam MS-16 diode
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