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	== PDP-11 Mainframe Troubleshooting Guide (December 1976) ==		== PDP-11 Mainframe Troubleshooting Guide (December 1976) ==
	DEC Field Service's flowcharts and DECAID reference sheets for PDP-11/05, 10, 35, 40 and 45 systems, first printing December 1976, 122 pages, marked company confidential.<ref name="mtg" /> ~~The 11/34 is not among its processors, but its~~ power sheets apply to the ~~same~~ regulators: PWRB-1 gives the H744 and H745 specifications and the method for backplane voltage checks, and PWRB-3 the procedure for a regulator that has crowbarred. Other sheets cover AC LO and DC LO locations, quiescent Unibus levels, MAINDEC lists and run times, and loaders.<ref name="mtg" />		DEC Field Service's flowcharts and DECAID reference sheets for PDP-11/05, 10, 35, 40 and 45 systems, first printing December 1976, 122 pages, marked company confidential.<ref name="mtg" /> Its power sheets apply to the regulators the 11/34 also uses: PWRB-1 gives the H744 and H745 specifications and the method for backplane voltage checks, and PWRB-3 the procedure for a regulator that has crowbarred. Other sheets cover AC LO and DC LO locations, quiescent Unibus levels, MAINDEC lists and run times, and loaders.<ref name="mtg" />

	<pdf width="800" height="500">File:PDP-11 Mainframe Troubleshooting Guide (December 1976).pdf</pdf>		<pdf width="800" height="500">File:PDP-11 Mainframe Troubleshooting Guide (December 1976).pdf</pdf>

Josh: New page: cited from DEC 11/34 user's manual, 11/34A power system, H744 drawings and restorers' reports

2026-10-02T01:24:06Z

New page: cited from DEC 11/34 user's manual, 11/34A power system, H744 drawings and restorers' reports

New page

'''PDP-11/34 Documentation''' describes the Digital Equipment Corporation documents for the [[PDP-11/34]] and its H765 power system, with the PDF of each.

== PDP-11/34 System User's Manual (EK-11034-UG-001) ==
DEC's user manual for the 11/34 and 11/34A, first edition July 1977, 133 pages scanned.<ref name="ug" />

Contents: 1 introduction: the KD11-E and KD11-EA processors, consoles, M9301 bootstrap/terminator, M9302 terminator, MOS and core memories, BA11-L and BA11-K boxes, options (pp. 1-1 to 1-14); 2 operation of the KY11-LA operator's console with the M9301 console emulator and bootstrap codes, and the KY11-LB programmer's console; 3 functional description of the halt, boot and power-switch logic and the M9301 firmware; 4 configuration: DD11-PK, DK and CK backplanes, power connector pin assignments (Tables 4-1 and 4-2), Unibus pin designations, module placement, switch and jumper settings for the M9301, DL11-W and memories; 5 installation: site, electrical requirements, initial inspection, typical switch settings, first-time start-up and the diagnostic list (Table 5-1); 6 troubleshooting: characteristics summary, quick verification routine and flowcharts for its seven actions (pp. 6-1 to 6-14). Appendices: KY11-LB maintenance mode, extended addressing, and a table of PDP-11 equipment specifications.<ref name="ug" />

It does not describe the power supplies beyond naming them; DEC refers to the mounting box manuals for the H765 and H777.<ref name="ug" />

<pdf width="800" height="500">File:PDP-11-34 System User's Manual (EK-11034-UG-001).pdf</pdf>

Download: [[:File:PDP-11-34 System User's Manual (EK-11034-UG-001).pdf|PDP-11-34 System User's Manual (EK-11034-UG-001).pdf]]

== PDP11/34A Power System (EK-1134A-TM-002) ==
DEC's description of the 11/34A power system, second edition July 1977 (first June 1977), 25 pages with a text layer.<ref name="pwr" /> It covers the H775 battery backup unit, the H7441 +5 V 32 A and H785 MOS regulators, the differences from the 11/34 power system (Table 1-2), the parts of the H765 chassis and the 70-13323 regulator configurations (Table 1-3, p. 1-6), the 54-10864-0 and -YA distribution boards, installation of the H775, H785 and H7441, and the backplane +5B, +15B and −15B jumpers (Table 2-1 and Figures 2-4 and 2-5). It has no circuit descriptions.<ref name="pwr" />

<pdf width="800" height="500">File:PDP-11-34A Power System Description (EK-1134A-TM-002).pdf</pdf>

Download: [[:File:PDP-11-34A Power System Description (EK-1134A-TM-002).pdf|PDP-11-34A Power System Description (EK-1134A-TM-002).pdf]]

== H765 power supply print set ==
DEC's print set for the H765, drawing directory D-DD-H765-0 revision R, September 1977, 28 sheets.<ref name="ps" /> The directory lists the chassis, the transformer assembly (70-11486), the AC input box, the power line monitor 54-11086 (+15 V regulator), the cap/MOV board 54-11689, the AC power control board, the power distribution board 54-10864, the H744, H745 and H754 regulators, cover and packaging. The scan is of reduced engineering drawings; values on some sheets are hard to read.<ref name="ps" />

<pdf width="800" height="500">File:H765 Power Supply Print Set (Rev R, 1977).pdf</pdf>

Download: [[:File:H765 Power Supply Print Set (Rev R, 1977).pdf|H765 Power Supply Print Set (Rev R, 1977).pdf]]

== H744 regulator engineering drawings ==
DEC's April 1974 drawing set for the H744 +5 V 25 A regulator, four sheets including the circuit schematic and the assembly drawing with its parts list. The parts list gives the capacitor values and DEC part numbers used on [[PDP-11/34 Power Supply Restoration]].<ref name="h744" /> The H7441 that replaced it in the 11/34A has its own print set (MP00271), which is not hosted here.<ref name="hg" />

<pdf width="800" height="500">File:H744 Regulator Engineering Drawings (1974).pdf</pdf>

Download: [[:File:H744 Regulator Engineering Drawings (1974).pdf|H744 Regulator Engineering Drawings (1974).pdf]]

== PDP-11 Mainframe Troubleshooting Guide (December 1976) ==
DEC Field Service's flowcharts and DECAID reference sheets for PDP-11/05, 10, 35, 40 and 45 systems, first printing December 1976, 122 pages, marked company confidential.<ref name="mtg" /> The 11/34 is not among its processors, but its power sheets apply to the same regulators: PWRB-1 gives the H744 and H745 specifications and the method for backplane voltage checks, and PWRB-3 the procedure for a regulator that has crowbarred. Other sheets cover AC LO and DC LO locations, quiescent Unibus levels, MAINDEC lists and run times, and loaders.<ref name="mtg" />

<pdf width="800" height="500">File:PDP-11 Mainframe Troubleshooting Guide (December 1976).pdf</pdf>

Download: [[:File:PDP-11 Mainframe Troubleshooting Guide (December 1976).pdf|PDP-11 Mainframe Troubleshooting Guide (December 1976).pdf]]

== Not hosted here ==
Bitsavers holds the KD11-E and KD11-EA processor maintenance manuals, the FP11-A and KK11-A manuals, the KY11-LB maintenance manual and print sets, the 11/34 field maintenance print set volume 2 (MP00082), the BA11-K engineering drawings, and DEC drawings for the H742, H745 and H754.<ref name="bits" /> Henk Gooijen lists the 11/34A power supply unit print set (MP00270) and the H7441 print set (MP00271) among the documents for the machine.<ref name="hg" />

== Pages that cite these documents ==
* [[PDP-11/34]] – configuration, hardware, power
* [[PDP-11/34 General Maintenance]] – site, inspection, start-up, power budget, jumpers
* [[PDP-11/34 Troubleshooting Guide]] – quick verification routine, M9301 failure addresses, regulator checks
* [[PDP-11/34 Power Supply Restoration]] – H765 parts, regulators, H744 capacitors, crowbar procedure

== References ==
<references>
<ref name="ug">Digital Equipment Corporation, ''PDP-11/34 System User's Manual'', EK-11034-UG-001, title page and contents. Source: [https://bitsavers.org/pdf/dec/pdp11/1134/1134_UsersManual.pdf bitsavers.org].</ref>
<ref name="pwr">Digital Equipment Corporation, ''PDP11/34A Power System'', EK-1134A-TM-002, title page and contents. Source: [https://bitsavers.org/pdf/dec/pdp11/1134/EK-1134A-TM-002_PDP1134A_PowerSys_Jul77.pdf bitsavers.org].</ref>
<ref name="ps">Digital Equipment Corporation, H765 power supply print set, drawing directory sheets. Source: [https://bitsavers.org/pdf/dec/powerSupply/H765_revR_Sep1977.pdf bitsavers.org].</ref>
<ref name="h744">Digital Equipment Corporation, H744 regulator engineering drawings, 1974. Source: [https://bitsavers.org/pdf/dec/powerSupply/H744_Regulator_EngrDrws_197404.pdf bitsavers.org].</ref>
<ref name="mtg">Digital Equipment Corporation, ''PDP-11 Mainframe Troubleshooting Guide (Flows and DECAIDs)'', title page, contents and introduction. Source: [https://bitsavers.org/pdf/dec/pdp11/PDP-11_Mainframe_Troubleshooting_Guide_Dec76.pdf bitsavers.org].</ref>
<ref name="bits">Bitsavers directories [https://bitsavers.org/pdf/dec/pdp11/1134/ pdf/dec/pdp11/1134/], [https://bitsavers.org/pdf/dec/unibus/BA11-K/ pdf/dec/unibus/BA11-K/] and [https://bitsavers.org/pdf/dec/powerSupply/ pdf/dec/powerSupply/], retrieved 2 October 2026.</ref>
<ref name="hg">Henk Gooijen, "PDP-11/34A CPU information", [http://www.pdp-11.nl/pdp11-34a/pdp11-34general.html pdp-11.nl]. Document list.</ref>
</references>

[[Category:Digital Equipment Corporation]]
[[Category:Service Manuals]]

PDP-11/34 Documentation - Revision history

Josh: Copyedit

Josh: New page: cited from DEC 11/34 user's manual, 11/34A power system, H744 drawings and restorers' reports