H742 Power Supply - Revision history

Jnc: New cat

2023-07-10T12:59:28Z

New cat

Ashlin4010 at 07:49, 28 March 2023

2023-03-28T07:49:15Z

Ashlin4010: /* External links */

2023-03-25T21:05:07Z

‎External links

Ashlin4010: /* External links */

2023-03-25T21:04:34Z

‎External links

Jnc: New cat

2022-06-16T12:16:18Z

New cat

Jnc: /* External links */ covered here

2022-01-11T12:28:24Z

‎External links: covered here

Jnc: Tweaks to presentation and contents

2019-06-10T18:00:54Z

Tweaks to presentation and contents

Jnc: Details on H7420 differences

2019-06-07T13:55:12Z

Details on H7420 differences

Jnc: Add 15V board

2019-06-06T17:16:17Z

Add 15V board

Jnc: Avoid redir after move

2018-09-26T21:43:27Z

Avoid redir after move

← Older revision		Revision as of 12:59, 10 July 2023
Line 27:		Line 27:
	* [https://mouser.com/ProductDetail/VCC/6073-001-634R?qs=QjVfaZ6cteJFZI1gq5P05A%3D%3D Mouser Replacement Lamp] - VCC 6073-001-634R		* [https://mouser.com/ProductDetail/VCC/6073-001-634R?qs=QjVfaZ6cteJFZI1gq5P05A%3D%3D Mouser Replacement Lamp] - VCC 6073-001-634R

−	[[Category: DEC ~~Electrical~~]]	+	[[Category: DEC Power Supplies]]

@@ Line 15: / Line 15: @@
 A later version of the basic H742 is the H742A; the difference is not yet known.
-For the H7420, in addition to the board above, the differences seem to be mainly mechanical: a larger cooling fan; a change in the orientation of the +15V supply board from horizontal to vertical (perhaps to make room for the fant); and the sheet metal enclosure holding the fan, board and transformer is a single unit, not two bolted together, as in the H742.
+For the H7420, in addition to the board above, the differences seem to be mainly mechanical: a larger cooling fan; a change in the orientation of the +15V supply board from horizontal to vertical (perhaps to make room for the fans); and the sheet metal enclosure holding the fan, board and transformer is a single unit, not two bolted together, as in the H742.
 ==See also==
@@ Line 25: / Line 25: @@
 * [http://www.bitsavers.org/pdf/dec/pdp11/1160/EK-11060-SV-01_1160cab_Feb78.pdf PDP-11/60 cabinet and power supply manual] - the H7420 is covered in Chapter 3 (pg. 32 of the scanned version)
 * [https://bitsavers.org/pdf/dec/pdp11/PDP-11_Mainframe_Troubleshooting_Guide_Dec76.pdf PDP-11 Mainframe Troubleshooting Guide] - the H742 connector pinout can be found on page 114
 [[Category: DEC Electrical]]

@@ Line 24: / Line 24: @@
 * [http://www.bitsavers.org/pdf/dec/pdp11/1160/EK-11060-SV-01_1160cab_Feb78.pdf PDP-11/60 cabinet and power supply manual] - the H7420 is covered in Chapter 3 (pg. 32 of the scanned version)
-* [https://bitsavers.org/pdf/dec/pdp11/PDP-11_Mainframe_Troubleshooting_Guide_Dec76.pdf PDP-11 Mainframe TroubleshootingGuide] - the H742 connector pinout can be found on page 114
+* [https://bitsavers.org/pdf/dec/pdp11/PDP-11_Mainframe_Troubleshooting_Guide_Dec76.pdf PDP-11 Mainframe Troubleshooting Guide] - the H742 connector pinout can be found on page 114
 [[Category: DEC Electrical]]

← Older revision		Revision as of 21:04, 25 March 2023
Line 24:		Line 24:

	* [http://www.bitsavers.org/pdf/dec/pdp11/1160/EK-11060-SV-01_1160cab_Feb78.pdf PDP-11/60 cabinet and power supply manual] - the H7420 is covered in Chapter 3 (pg. 32 of the scanned version)		* [http://www.bitsavers.org/pdf/dec/pdp11/1160/EK-11060-SV-01_1160cab_Feb78.pdf PDP-11/60 cabinet and power supply manual] - the H7420 is covered in Chapter 3 (pg. 32 of the scanned version)
		+	* [https://bitsavers.org/pdf/dec/pdp11/PDP-11_Mainframe_Troubleshooting_Guide_Dec76.pdf PDP-11 Mainframe TroubleshootingGuide] - the H742 connector pinout can be found on page 114

	[[Category: DEC Electrical]]		[[Category: DEC Electrical]]

← Older revision		Revision as of 12:16, 16 June 2022
Line 25:		Line 25:
	* [http://www.bitsavers.org/pdf/dec/pdp11/1160/EK-11060-SV-01_1160cab_Feb78.pdf PDP-11/60 cabinet and power supply manual] - the H7420 is covered in Chapter 3 (pg. 32 of the scanned version)		* [http://www.bitsavers.org/pdf/dec/pdp11/1160/EK-11060-SV-01_1160cab_Feb78.pdf PDP-11/60 cabinet and power supply manual] - the H7420 is covered in Chapter 3 (pg. 32 of the scanned version)

−	[[Category: DEC ~~Hardware~~]]	+	[[Category: DEC Electrical]]

← Older revision		Revision as of 12:28, 11 January 2022
Line 20:		Line 20:

	* [[H765 Power System]]		* [[H765 Power System]]
		+
		+	==External links==
		+
		+	* [http://www.bitsavers.org/pdf/dec/pdp11/1160/EK-11060-SV-01_1160cab_Feb78.pdf PDP-11/60 cabinet and power supply manual] - the H7420 is covered in Chapter 3 (pg. 32 of the scanned version)

	[[Category: DEC Hardware]]		[[Category: DEC Hardware]]

@@ Line 1: / Line 1: @@
-The '''H742 Power Supply''', and later revision '''H7420''', is a modular [[power supply]] system from [[Digital Equipment Corporation|DEC]], used with the [[BA11-F Mounting Box]]. Among other uses, this mounting box is used in [[PDP-11/40]], [[PDP-11/45]] and [[PDP-11/70]] systems to hold the [[Central Processing Unit|CPU]].
+The '''H742 Power Supply''', and later revision '''H7420''', is a modular [[power supply]] system from [[Digital Equipment Corporation|DEC]], used with the [[BA11-F Mounting Box]]. Among other uses, that mounting box is used in [[PDP-11/40]], [[PDP-11/45]] and [[PDP-11/70]] systems to hold the [[Central Processing Unit|CPU]].
 The H742/H7420 runs off standard wall [[Alternating current|AC]]; it can be [[jumper]]ed to use either 110V or 220V supply.
@@ Line 7: / Line 7: @@
 Generally the [[power harness]] supports only limited options as to which regulator can be in which spaces; e.g. the later -11/40 harness mandates that A, B and C hold [[H744 +5V Regulator]]s, D holds an [[H745 -15V Regulator]], and E may hold either an H745 or [[H754 +20V, -5V Regulator]].
-A 5409730 board in the H742, replaced by an [[DEC Power Line Monitor|5411086 board]] in the H7420, supplies a modest amount of +15V [[Direct current|DC]] power to various backplanes mounted in the BA11-F, along with a [[line time clock]] signal, and AC and DC 'power OK' signals.
+A [[DEC Power Line Monitor|5409730 board]] in the H742, replaced by an 5411086 board in the H7420, supplies a modest amount of +15V [[Direct current|DC]] power to various backplanes mounted in the BA11-F, along with a [[line time clock]] signal, and AC and DC 'power OK' signals.
-The harness used [[DEC power distribution connectors]] to provide power to the backplanes; it normally used the [[DEC standard power wire colour coding]].
+The harness from the H742/H7420 (the same for both, it appears) used [[DEC power distribution connectors]] to provide power to the backplanes; it normally used the [[DEC standard power wire colour coding]].
 The H742/H7420 did not support the [[Remote Switching Control Bus]]; the H742/H7420 was generally plugged into an [[861 Power Controller]], which did have the remote control capability.
-A later version of the basic H742 is the H742A; the difference is not yet known. For the H7420, in addition to the board above, the differences are mechanical; a larger cooling fan, and the sheet metal cavity holding it, the board and the transformer is a single unit, not two bolted together, as in the H742.
+A later version of the basic H742 is the H742A; the difference is not yet known.
 ==See also==

@@ Line 1: / Line 1: @@
-The '''H742 Power Supply''' is a modular [[power supply]] system from [[Digital Equipment Corporation|DEC]], used in [[PDP-11/40]], [[PDP-11/45]] and [[PDP-11/70]] systems mounted in a [[BA11-F Mounting Box]].
+The '''H742 Power Supply''' is a modular [[power supply]] system from [[Digital Equipment Corporation|DEC]], used with the [[BA11-F Mounting Box]]; among other uses, this mounting box is used in
-It runs off standard wall [[Alternating current|AC]]; it can be [[jumper]]ed to use either 110V or 220V supply.
+The H742 runs off standard wall [[Alternating current|AC]]; it can be [[jumper]]ed to use either 110V or 220V supply.
-The H742 supplies a modest amount of +15V [[Direct current|DC]] power to various [[backplane]]s mounted in the BA11-F, along with a [[line time clock]] signal, and AC and DC 'power OK' signals.
+The main [[transformer]] in the H742 provides 20-30V AC to several [[DEC standard modular regulators]] (up to five, in spaces numbered 'A' through 'E') mounted in the H742, which provide other voltages such as +5V to the [[backplane]]s in the mounting box.
-It also supplies 20-30V AC to several [[DEC standard modular regulators]] (up to five, in spaces numbered 'A' through 'E') mounted in the H742, which provide other voltages such as +5V to the backplanes in the mounting box.
+Generally the [[power harness]] supports only limited options as to which regulator can be in which spaces; e.g. the later -11/40 harness mandates that A, B and C hold [[H744 +5V Regulator]]s, D holds an [[H745 -15V Regulator]], and E may hold either an H745 or [[H754 +20V, -5V Regulator]].
-Generally the [[power harness]] supports only limited options as to which regulator can be in which spaces; e.g. the later -11/40 harness mandates that A, B and C hold [[H744 +5V Regulator]]s, D holds an [[H745 -15V Regulator]], and E may hold either an H745 or [[H754 +20V, -5V Regulator]].
+A 5409730 board in the H742 supplies a modest amount of +15V [[Direct current|DC]] power to various backplanes mounted in the BA11-F, along with a [[line time clock]] signal, and AC and DC 'power OK' signals.
 The harness used [[DEC power distribution connectors]] to provide power to the backplanes; it normally used the [[DEC standard power wire colour coding]].
@@ Line 17: / Line 18: @@
 ==See also==
-* [[H765 Power System ]]
+* [[H765 Power System]]
 [[Category: DEC Hardware]]