F1 fuse repair - Revision history

Unknown user at 04:14, 11 February 2020

2020-02-11T04:14:56Z

← Older revision		Revision as of 04:14, 11 February 2020
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	[[File:Dreamcast controller board rear view.png\|645px\|thumb\|center\|Rear view of a Dreamcast controller board; F1 is on the left behind the capacitor, and R1 is between the battery and bus connector.]]		[[File:Dreamcast controller board rear view.png\|645px\|thumb\|center\|Rear view of a Dreamcast controller board; F1 is on the left behind the capacitor, and R1 is between the battery and bus connector.]]
	~~<br>~~
	[[File:Dreamcast F1 fuse resistor.png\|thumb\|right\|101px\|A blown Dreamcast F1 fuse resistor]]		[[File:Dreamcast F1 fuse resistor.png\|thumb\|right\|101px\|A blown Dreamcast F1 fuse resistor]]
	The Dreamcast's controller board contains a fuse labelled F1 that can blow and cause the console's controller ports to no longer function. This fuse can be replaced by an automatically resetting fuse that will revert back to a functioning state within a few moments.		The Dreamcast's controller board contains a fuse labelled F1 that can blow and cause the console's controller ports to no longer function. This fuse can be replaced by an automatically resetting fuse that will revert back to a functioning state within a few moments.
	~~<br>~~
	~~<br>~~		The stock part, despite being labelled as a fuse, most closely resembles a 1/4 W, 0.39 Ω ± 10% metal film resistor. Various electronics component retailers sell part number MFR-25FTF52-0R39 by Yageo, which matches these specifications (it is actually a little bit better, and as of January 2020 it costs less than $9 USD for 100 of them). Note the green band on F1 actually represents a temperature coefficient, specifically indicating a value of 20 ppm/K--that is, for every 1K (1°C) increase in temperature, the resistance may change by no more than 20 parts per million.<ref>http://www.resistorguide.com/resistor-color-code/</ref> This information is typically provided in the datasheet of a resistor series, and the suggested Yageo part has a rating of 0ppm/°C up to 70°C (158°F), after which it becomes 100ppm/°C.<ref>https://www.mouser.com/datasheet/2/447/Yageo%20LR_MFR_2013-467719.pdf</ref> Bear in mind that, under normal operating circumstances, a Dreamcast's internal ambient temperature should never even come close to 70°C (158°F). If for some reason the console's air temperature around the controller board gets that hot, it would indicate a far more serious problem needs to be addressed (e.g. blocked airflow, failing fan, missing heat sink, being used outside in the Arabian desert, something is literally on fire, etc.).
	The stock part, despite being labelled as a fuse, most closely resembles a 1/4 W, 0.39 Ω ± 10% metal film resistor. Various electronics component retailers sell part number MFR-25FTF52-0R39 by Yageo, which matches these specifications (it is actually a little bit better, and as of January 2020 it costs less than $9 USD for 100 of them). Note the green band on F1 actually represents a temperature coefficient, specifically indicating a value of 20 ppm/K--that is, for every 1K (1°C) increase in temperature, the resistance may change by no more than 20 parts per million.<ref>http://www.resistorguide.com/resistor-color-code/</ref> This information is typically provided in the datasheet of a resistor series, and the suggested Yageo part has a rating of 0ppm/°C up to 70°C (158°F), after which it becomes 100ppm/°C.<ref>https://www.mouser.com/datasheet/2/447/Yageo%20LR_MFR_2013-467719.pdf</ref> Bear in mind that, under normal operating circumstances, a Dreamcast's internal ambient temperature should never even come close to 70°C (158°F)~~--if~~ for some reason it ~~does, that indicates~~ a far more serious problem needs to be addressed (e.g. blocked airflow, failing fan, missing heat sink, being used outside in the Arabian desert, something is literally on fire, etc.).
	~~<br>~~		R1, the other resistor on the Dreamcast controller board, is a standard 1/2 W, 13 Ω ± 5% resistor electrically matched by Yageo-branded part number MFR50SFTE52-13R (note: the Yageo part is actually a "mini" size resistor, so it is 1/2 W in the form factor normally used for 1/4 W). However, it appears that R1 is meant to be replaced with a 1 W, 13 Ω ± 5% resistor,<ref>http://www.thedreamcastjunkyard.co.uk/2017/02/the-official-sega-dreamcast-eu-service.html</ref> which is matched by Vishay-branded part number PR01000101309JR500. This resistor does not tend to fail as frequently as F1, and generally does not need to be replaced. It is part of the timekeeping circuit with the adjacent battery.
	~~<br>~~
	R1, the other resistor on the Dreamcast controller board, is a standard 1/2 W, 13 Ω ± 5% resistor electrically matched by Yageo-branded part number MFR50SFTE52-13R (note: the Yageo part is actually a "mini" size resistor, so it is 1/2 W in the form factor normally used for 1/4 W). However, it appears that R1 is meant to be replaced with a 1 W, 13 Ω ± 5% resistor,<ref>http://www.thedreamcastjunkyard.co.uk/2017/02/the-official-sega-dreamcast-eu-service.html</ref> which is matched by Vishay-branded part number PR01000101309JR500. This resistor does not tend to fail as frequently as F1, and generally does not need to be replaced. It is part of the timekeeping circuit with the adjacent battery.		== References ==

Unknown user: Ok, I'm good now :P

2020-02-11T03:06:36Z

Ok, I'm good now :P

← Older revision		Revision as of 03:06, 11 February 2020
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	<br>		<br>
	<br>		<br>
	The stock part, despite being labelled as a fuse, most closely resembles a 1/4 W, 0.39 Ω ± 10% metal film resistor. Various electronics component retailers sell part number MFR-25FTF52-0R39 by Yageo, which matches these specifications (it is actually a little bit better, and as of January 2020 it costs less than $9 USD for 100 of them). Note the green band on F1 actually represents a temperature coefficient, specifically indicating a value of 20 ppm/K--that is, for every 1K (1°C) increase in temperature, the resistance may change by no more than 20 parts per million.<ref>http://www.resistorguide.com/resistor-color-code/</ref> This information is typically provided in the datasheet of a resistor series, and the suggested Yageo part has a rating of 0ppm/°C up to 70°C (158°F), after which it becomes 100ppm/°C.<ref>https://www.mouser.com/datasheet/2/447/Yageo%20LR_MFR_2013-467719.pdf</ref> Bear in mind that, under normal operating circumstances, a Dreamcast's internal ambient temperature should never even come close to 70°C (158°F)--if for some reason it does, that indicates a far more serious problem needs to be addressed (e.g. blocked airflow, failing fan, missing heat sink, being used outside in the Arabian desert, ~~being~~ literally on fire, etc.).		The stock part, despite being labelled as a fuse, most closely resembles a 1/4 W, 0.39 Ω ± 10% metal film resistor. Various electronics component retailers sell part number MFR-25FTF52-0R39 by Yageo, which matches these specifications (it is actually a little bit better, and as of January 2020 it costs less than $9 USD for 100 of them). Note the green band on F1 actually represents a temperature coefficient, specifically indicating a value of 20 ppm/K--that is, for every 1K (1°C) increase in temperature, the resistance may change by no more than 20 parts per million.<ref>http://www.resistorguide.com/resistor-color-code/</ref> This information is typically provided in the datasheet of a resistor series, and the suggested Yageo part has a rating of 0ppm/°C up to 70°C (158°F), after which it becomes 100ppm/°C.<ref>https://www.mouser.com/datasheet/2/447/Yageo%20LR_MFR_2013-467719.pdf</ref> Bear in mind that, under normal operating circumstances, a Dreamcast's internal ambient temperature should never even come close to 70°C (158°F)--if for some reason it does, that indicates a far more serious problem needs to be addressed (e.g. blocked airflow, failing fan, missing heat sink, being used outside in the Arabian desert, something is literally on fire, etc.).
	<br>		<br>
	<br>		<br>
	R1, the other resistor on the Dreamcast controller board, is a standard 1/2 W, 13 Ω ± 5% resistor electrically matched by Yageo-branded part number MFR50SFTE52-13R (note: the Yageo part is actually a "mini" size resistor, so it is 1/2 W in the form factor normally used for 1/4 W). However, it appears that R1 is meant to be replaced with a 1 W, 13 Ω ± 5% resistor,<ref>http://www.thedreamcastjunkyard.co.uk/2017/02/the-official-sega-dreamcast-eu-service.html</ref> which is matched by Vishay-branded part number PR01000101309JR500. This resistor does not tend to fail as frequently as F1, and generally does not need to be replaced. It is part of the timekeeping circuit with the adjacent battery.		R1, the other resistor on the Dreamcast controller board, is a standard 1/2 W, 13 Ω ± 5% resistor electrically matched by Yageo-branded part number MFR50SFTE52-13R (note: the Yageo part is actually a "mini" size resistor, so it is 1/2 W in the form factor normally used for 1/4 W). However, it appears that R1 is meant to be replaced with a 1 W, 13 Ω ± 5% resistor,<ref>http://www.thedreamcastjunkyard.co.uk/2017/02/the-official-sega-dreamcast-eu-service.html</ref> which is matched by Vishay-branded part number PR01000101309JR500. This resistor does not tend to fail as frequently as F1, and generally does not need to be replaced. It is part of the timekeeping circuit with the adjacent battery.

Unknown user at 03:05, 11 February 2020

2020-02-11T03:05:35Z

← Older revision		Revision as of 03:05, 11 February 2020
Line 5:		Line 5:
	<br>		<br>
	<br>		<br>
	The stock part, despite being labelled as a fuse, most closely resembles a 1/4 W, 0.39 Ω ± 10% metal film resistor. Various electronics component retailers sell part number MFR-25FTF52-0R39 by Yageo, which matches these specifications (it is actually a little bit better, and as of January 2020 it costs less than $9 USD for 100 of them). Note the green band on F1 actually represents a temperature coefficient, specifically indicating a value of 20 ppm/K--that is, for every 1K (1°C) increase in temperature, the resistance may change by no more than 20 parts per million.<ref>http://www.resistorguide.com/resistor-color-code/</ref> This information is typically provided in the datasheet of a resistor series, and the suggested Yageo part has a rating of 0ppm/°C up to 70°C (158°F), after which it becomes 100ppm/°C.<ref>https://www.mouser.com/datasheet/2/447/Yageo%20LR_MFR_2013-467719.pdf</ref> Bear in mind that a Dreamcast should never even ~~get~~ close to 70°C ~~internally unless there is major overheating or an~~ airflow ~~restriction problem~~.		The stock part, despite being labelled as a fuse, most closely resembles a 1/4 W, 0.39 Ω ± 10% metal film resistor. Various electronics component retailers sell part number MFR-25FTF52-0R39 by Yageo, which matches these specifications (it is actually a little bit better, and as of January 2020 it costs less than $9 USD for 100 of them). Note the green band on F1 actually represents a temperature coefficient, specifically indicating a value of 20 ppm/K--that is, for every 1K (1°C) increase in temperature, the resistance may change by no more than 20 parts per million.<ref>http://www.resistorguide.com/resistor-color-code/</ref> This information is typically provided in the datasheet of a resistor series, and the suggested Yageo part has a rating of 0ppm/°C up to 70°C (158°F), after which it becomes 100ppm/°C.<ref>https://www.mouser.com/datasheet/2/447/Yageo%20LR_MFR_2013-467719.pdf</ref> Bear in mind that, under normal operating circumstances, a Dreamcast's internal ambient temperature should never even come close to 70°C (158°F)--if for some reason it does, that indicates a far more serious problem needs to be addressed (e.g. blocked airflow, failing fan, missing heat sink, being used outside in the Arabian desert, being literally on fire, etc.).
	<br>		<br>
	<br>		<br>
	R1, the other resistor on the Dreamcast controller board, is a standard 1/2 W, 13 Ω ± 5% resistor electrically matched by Yageo-branded part number MFR50SFTE52-13R (note: the Yageo part is actually a "mini" size resistor, so it is 1/2 W in the form factor normally used for 1/4 W). However, it appears that R1 is meant to be replaced with a 1 W, 13 Ω ± 5% resistor,<ref>http://www.thedreamcastjunkyard.co.uk/2017/02/the-official-sega-dreamcast-eu-service.html</ref> which is matched by Vishay-branded part number PR01000101309JR500. This resistor does not tend to fail as frequently as F1~~, however~~, and generally does not need to be replaced. It is part of the timekeeping circuit with the adjacent battery.		R1, the other resistor on the Dreamcast controller board, is a standard 1/2 W, 13 Ω ± 5% resistor electrically matched by Yageo-branded part number MFR50SFTE52-13R (note: the Yageo part is actually a "mini" size resistor, so it is 1/2 W in the form factor normally used for 1/4 W). However, it appears that R1 is meant to be replaced with a 1 W, 13 Ω ± 5% resistor,<ref>http://www.thedreamcastjunkyard.co.uk/2017/02/the-official-sega-dreamcast-eu-service.html</ref> which is matched by Vishay-branded part number PR01000101309JR500. This resistor does not tend to fail as frequently as F1, and generally does not need to be replaced. It is part of the timekeeping circuit with the adjacent battery.

Unknown user: grammar fix

2020-02-11T02:36:56Z

grammar fix

← Older revision		Revision as of 02:36, 11 February 2020
Line 5:		Line 5:
	<br>		<br>
	<br>		<br>
	The stock part, despite being labelled as a fuse, most closely resembles a 1/4 W, 0.39 Ω ± 10% metal film resistor. Various electronics component retailers sell part number MFR-25FTF52-0R39 by Yageo, which matches these specifications (it is actually a little bit better, and as of January 2020 it costs less than $9 USD for 100 of them). Note the green band on F1 actually represents a temperature coefficient, specifically indicating a value of 20 ppm/K--that is, for every 1K (1°C) increase in temperature, the resistance may change by no more than 20 parts per million.<ref>http://www.resistorguide.com/resistor-color-code/</ref> This information is typically provided in the datasheet of a resistor series, and the suggested Yageo part has a rating of 0ppm/°C up to 70°C (158°F), after which it becomes 100ppm/°C.<ref>https://www.mouser.com/datasheet/2/447/Yageo%20LR_MFR_2013-467719.pdf</ref> Bear in mind that a Dreamcast should never even get close to 70°C internally unless there is a major overheating or airflow restriction problem.		The stock part, despite being labelled as a fuse, most closely resembles a 1/4 W, 0.39 Ω ± 10% metal film resistor. Various electronics component retailers sell part number MFR-25FTF52-0R39 by Yageo, which matches these specifications (it is actually a little bit better, and as of January 2020 it costs less than $9 USD for 100 of them). Note the green band on F1 actually represents a temperature coefficient, specifically indicating a value of 20 ppm/K--that is, for every 1K (1°C) increase in temperature, the resistance may change by no more than 20 parts per million.<ref>http://www.resistorguide.com/resistor-color-code/</ref> This information is typically provided in the datasheet of a resistor series, and the suggested Yageo part has a rating of 0ppm/°C up to 70°C (158°F), after which it becomes 100ppm/°C.<ref>https://www.mouser.com/datasheet/2/447/Yageo%20LR_MFR_2013-467719.pdf</ref> Bear in mind that a Dreamcast should never even get close to 70°C internally unless there is major overheating or an airflow restriction problem.
	<br>		<br>
	<br>		<br>
	R1, the other resistor on the Dreamcast controller board, is a standard 1/2 W, 13 Ω ± 5% resistor electrically matched by Yageo-branded part number MFR50SFTE52-13R (note: the Yageo part is actually a "mini" size resistor, so it is 1/2 W in the form factor normally used for 1/4 W). However, it appears that R1 is meant to be replaced with a 1 W, 13 Ω ± 5% resistor,<ref>http://www.thedreamcastjunkyard.co.uk/2017/02/the-official-sega-dreamcast-eu-service.html</ref> which is matched by Vishay-branded part number PR01000101309JR500. This resistor does not tend to fail as frequently as F1, however, and generally does not need to be replaced. It is part of the timekeeping circuit with the adjacent battery.		R1, the other resistor on the Dreamcast controller board, is a standard 1/2 W, 13 Ω ± 5% resistor electrically matched by Yageo-branded part number MFR50SFTE52-13R (note: the Yageo part is actually a "mini" size resistor, so it is 1/2 W in the form factor normally used for 1/4 W). However, it appears that R1 is meant to be replaced with a 1 W, 13 Ω ± 5% resistor,<ref>http://www.thedreamcastjunkyard.co.uk/2017/02/the-official-sega-dreamcast-eu-service.html</ref> which is matched by Vishay-branded part number PR01000101309JR500. This resistor does not tend to fail as frequently as F1, however, and generally does not need to be replaced. It is part of the timekeeping circuit with the adjacent battery.

Unknown user: Note that the yageo equivalent of R1 is actually a mini sized resistor, so that anyone deciding to not go with the 1 W isn't surprised

2020-02-11T02:36:08Z

Note that the yageo equivalent of R1 is actually a mini sized resistor, so that anyone deciding to not go with the 1 W isn't surprised

← Older revision		Revision as of 02:36, 11 February 2020
Line 5:		Line 5:
	<br>		<br>
	<br>		<br>
	The stock part, despite being labelled as a fuse, most closely resembles a 1/4 W, 0.39 Ω ± 10% metal film resistor. Various electronics component retailers sell part number MFR-25FTF52-0R39 by Yageo, which matches these specifications (it is actually a little bit better, and as of January 2020 it costs less than $9 USD for 100 of them). Note the green band on F1 actually represents a temperature coefficient, specifically indicating a value of 20 ppm/K--that is, for every 1K = 1°C increase in temperature, the resistance may change by no more than 20 parts per million.<ref>http://www.resistorguide.com/resistor-color-code/</ref> This information is typically provided in the datasheet of a resistor series, and the suggested Yageo part has a rating of 0ppm/°C up to 70°C (158°F), after which it becomes 100ppm/°C. <ref>https://www.mouser.com/datasheet/2/447/Yageo%20LR_MFR_2013-467719.pdf</ref>		The stock part, despite being labelled as a fuse, most closely resembles a 1/4 W, 0.39 Ω ± 10% metal film resistor. Various electronics component retailers sell part number MFR-25FTF52-0R39 by Yageo, which matches these specifications (it is actually a little bit better, and as of January 2020 it costs less than $9 USD for 100 of them). Note the green band on F1 actually represents a temperature coefficient, specifically indicating a value of 20 ppm/K--that is, for every 1K (1°C) increase in temperature, the resistance may change by no more than 20 parts per million.<ref>http://www.resistorguide.com/resistor-color-code/</ref> This information is typically provided in the datasheet of a resistor series, and the suggested Yageo part has a rating of 0ppm/°C up to 70°C (158°F), after which it becomes 100ppm/°C.<ref>https://www.mouser.com/datasheet/2/447/Yageo%20LR_MFR_2013-467719.pdf</ref> Bear in mind that a Dreamcast should never even get close to 70°C internally unless there is a major overheating or airflow restriction problem.
	<br>		<br>
	<br>		<br>
	R1, the other resistor on the Dreamcast controller board, is a standard 1/2 W, 13 Ω ± 5% resistor matched by Yageo-branded part number MFR50SFTE52-13R. However, it appears that it is meant to be replaced with a 1 W, 13 Ω ± 5% resistor ~~(matched by Vishay-branded part number PR01000101309JR500).~~<ref>http://www.thedreamcastjunkyard.co.uk/2017/02/the-official-sega-dreamcast-eu-service.html</ref> This resistor does not tend to fail as frequently as F1, however, and generally does not need to be replaced. It is part of the timekeeping circuit with the adjacent battery.		R1, the other resistor on the Dreamcast controller board, is a standard 1/2 W, 13 Ω ± 5% resistor electrically matched by Yageo-branded part number MFR50SFTE52-13R (note: the Yageo part is actually a "mini" size resistor, so it is 1/2 W in the form factor normally used for 1/4 W). However, it appears that R1 is meant to be replaced with a 1 W, 13 Ω ± 5% resistor,<ref>http://www.thedreamcastjunkyard.co.uk/2017/02/the-official-sega-dreamcast-eu-service.html</ref> which is matched by Vishay-branded part number PR01000101309JR500. This resistor does not tend to fail as frequently as F1, however, and generally does not need to be replaced. It is part of the timekeeping circuit with the adjacent battery.

Unknown user: Be thorough by mentioning what R1 is and what it appears that it should be replaced with (see service manual)

2020-01-28T05:43:59Z

Be thorough by mentioning what R1 is and what it appears that it should be replaced with (see service manual)

← Older revision		Revision as of 05:43, 28 January 2020
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	<br>		<br>
	<br>		<br>
	R1, the other resistor on the Dreamcast controller board, is a 1 W, 13 Ω ± 5% resistor matched by Vishay-branded part number PR01000101309JR500. This resistor does not tend to fail as frequently as F1, however, and generally does not need to be replaced. It is part of the timekeeping circuit with the adjacent battery.		R1, the other resistor on the Dreamcast controller board, is a standard 1/2 W, 13 Ω ± 5% resistor matched by Yageo-branded part number MFR50SFTE52-13R. However, it appears that it is meant to be replaced with a 1 W, 13 Ω ± 5% resistor (matched by Vishay-branded part number PR01000101309JR500).<ref>http://www.thedreamcastjunkyard.co.uk/2017/02/the-official-sega-dreamcast-eu-service.html</ref> This resistor does not tend to fail as frequently as F1, however, and generally does not need to be replaced. It is part of the timekeeping circuit with the adjacent battery.

Unknown user: Turns out R1 is actually a 1 W resistor, not 1/2 W like I had thought. F1 appears to be correct.

2020-01-28T05:20:21Z

Turns out R1 is actually a 1 W resistor, not 1/2 W like I had thought. F1 appears to be correct.

← Older revision		Revision as of 05:20, 28 January 2020
Line 8:		Line 8:
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	<br>		<br>
	R1, the other resistor on the Dreamcast controller board, is a ~~standard~~ 1/2 W, 13 Ω ± 5% resistor matched by ~~Yageo~~-branded part number ~~MFR50SFTE52-13R~~. This resistor does not tend to fail as frequently as F1, however, and generally does not need to be replaced. It is part of the timekeeping circuit with the adjacent battery.		R1, the other resistor on the Dreamcast controller board, is a 1 W, 13 Ω ± 5% resistor matched by Vishay-branded part number PR01000101309JR500. This resistor does not tend to fail as frequently as F1, however, and generally does not need to be replaced. It is part of the timekeeping circuit with the adjacent battery.

Unknown user at 10:36, 18 January 2020

2020-01-18T10:36:56Z

← Older revision		Revision as of 10:36, 18 January 2020
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	[[File:Dreamcast controller board rear view.png\|~~640px~~\|thumb\|center\|Rear view of a Dreamcast controller board; F1 is on the left behind the capacitor, and R1 is between the battery and bus connector.]]		[[File:Dreamcast controller board rear view.png\|645px\|thumb\|center\|Rear view of a Dreamcast controller board; F1 is on the left behind the capacitor, and R1 is between the battery and bus connector.]]
	<br>		<br>
	[[File:Dreamcast F1 fuse resistor.png\|thumb\|right\|~~100px~~\|A blown Dreamcast F1 fuse resistor]]		[[File:Dreamcast F1 fuse resistor.png\|thumb\|right\|101px\|A blown Dreamcast F1 fuse resistor]]
	The Dreamcast's controller board contains a fuse labelled F1 that can blow and cause the console's controller ports to no longer function. This fuse can be replaced by an automatically resetting fuse that will revert back to a functioning state within a few moments.		The Dreamcast's controller board contains a fuse labelled F1 that can blow and cause the console's controller ports to no longer function. This fuse can be replaced by an automatically resetting fuse that will revert back to a functioning state within a few moments.
	<br>		<br>

Unknown user: This is mildly esoteric information, so put a source for it

2020-01-17T23:13:55Z

This is mildly esoteric information, so put a source for it

← Older revision		Revision as of 23:13, 17 January 2020
Line 5:		Line 5:
	<br>		<br>
	<br>		<br>
	The stock part, despite being labelled as a fuse, most closely resembles a 1/4 W, 0.39 Ω ± 10% metal film resistor. Various electronics component retailers sell part number MFR-25FTF52-0R39 by Yageo, which matches these specifications (it is actually a little bit better, and as of January 2020 it costs less than $9 USD for 100 of them). Note the green band on F1 actually represents a temperature coefficient, specifically indicating a value of 20 ppm/K--that is, for every 1K = 1°C increase in temperature, the resistance may change by no more than 20 parts per million. This information is typically provided in the datasheet of a resistor series, and the suggested Yageo part has a rating of 0ppm/°C up to 70°C (158°F), after which it becomes 100ppm/°C. <ref>https://www.mouser.com/datasheet/2/447/Yageo%20LR_MFR_2013-467719.pdf</ref>		The stock part, despite being labelled as a fuse, most closely resembles a 1/4 W, 0.39 Ω ± 10% metal film resistor. Various electronics component retailers sell part number MFR-25FTF52-0R39 by Yageo, which matches these specifications (it is actually a little bit better, and as of January 2020 it costs less than $9 USD for 100 of them). Note the green band on F1 actually represents a temperature coefficient, specifically indicating a value of 20 ppm/K--that is, for every 1K = 1°C increase in temperature, the resistance may change by no more than 20 parts per million.<ref>http://www.resistorguide.com/resistor-color-code/</ref> This information is typically provided in the datasheet of a resistor series, and the suggested Yageo part has a rating of 0ppm/°C up to 70°C (158°F), after which it becomes 100ppm/°C. <ref>https://www.mouser.com/datasheet/2/447/Yageo%20LR_MFR_2013-467719.pdf</ref>
	<br>		<br>
	<br>		<br>
	R1, the other resistor on the Dreamcast controller board, is a standard 1/2 W, 13 Ω ± 5% resistor matched by Yageo-branded part number MFR50SFTE52-13R. This resistor does not tend to fail as frequently as F1, however, and generally does not need to be replaced. It is part of the timekeeping circuit with the adjacent battery.		R1, the other resistor on the Dreamcast controller board, is a standard 1/2 W, 13 Ω ± 5% resistor matched by Yageo-branded part number MFR50SFTE52-13R. This resistor does not tend to fail as frequently as F1, however, and generally does not need to be replaced. It is part of the timekeeping circuit with the adjacent battery.

Unknown user: Fix ppm/K number and ppm/K description. This info is actually pretty important for a fuse.

2020-01-17T23:11:13Z

Fix ppm/K number and ppm/K description. This info is actually pretty important for a fuse.

← Older revision		Revision as of 23:11, 17 January 2020
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	The stock part, despite being labelled as a fuse, most closely resembles a 1/4 W, 0.39 Ω ± 10% metal film resistor. Various electronics component retailers sell part number MFR-25FTF52-0R39 by Yageo, which matches these specifications (it is actually a little bit better, and as of January 2020 it costs less than $9 USD for 100 of them). Note the green band on F1 actually represents a temperature coefficient, specifically indicating a value of 20 ppm/K--that is, for every 1K = 1°C increase in temperature, the resistance may change by no more than 20 parts per million. This information is typically provided in the datasheet of a resistor series, and the suggested Yageo part has a rating of ~~25ppm~~/°C ~~above~~ 70°C (~~and 0ppm~~/°C ~~below)~~.<ref>https://www.mouser.com/datasheet/2/447/Yageo%20LR_MFR_2013-467719.pdf</ref>		The stock part, despite being labelled as a fuse, most closely resembles a 1/4 W, 0.39 Ω ± 10% metal film resistor. Various electronics component retailers sell part number MFR-25FTF52-0R39 by Yageo, which matches these specifications (it is actually a little bit better, and as of January 2020 it costs less than $9 USD for 100 of them). Note the green band on F1 actually represents a temperature coefficient, specifically indicating a value of 20 ppm/K--that is, for every 1K = 1°C increase in temperature, the resistance may change by no more than 20 parts per million. This information is typically provided in the datasheet of a resistor series, and the suggested Yageo part has a rating of 0ppm/°C up to 70°C (158°F), after which it becomes 100ppm/°C. <ref>https://www.mouser.com/datasheet/2/447/Yageo%20LR_MFR_2013-467719.pdf</ref>
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	R1, the other resistor on the Dreamcast controller board, is a standard 1/2 W, 13 Ω ± 5% resistor matched by Yageo-branded part number MFR50SFTE52-13R. This resistor does not tend to fail as frequently as F1, however, and generally does not need to be replaced. It is part of the timekeeping circuit with the adjacent battery.		R1, the other resistor on the Dreamcast controller board, is a standard 1/2 W, 13 Ω ± 5% resistor matched by Yageo-branded part number MFR50SFTE52-13R. This resistor does not tend to fail as frequently as F1, however, and generally does not need to be replaced. It is part of the timekeeping circuit with the adjacent battery.