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Per-sheet revisions and dates read from the title blocks (sheets 2 and 7 are rev 4, 13 June 1991); sheet 6 values rechecked; note mislabelled RTC chip; remove uncited claims about the publisher and IBM
 
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The '''PS/2 Model 30 schematic set''' is eight sheets of circuit diagrams for the [[IBM PS/2 Model 30|PS/2 Model 30]] (8530) planar, '''Revision 3, dated 9 June 1991'''.
<templatestyles src="Template:StyledTable/styles.css" />
The '''PS/2 Model 30 schematic set''' is eight sheets of logic drawings of the [[IBM PS/2 Model 30|PS/2 Model 30]] (8530, 8086) system board, drawn by a third party, not IBM. Each title block reads "Maintenance Information Technology" and "PS/2 30"; the notice beside it names Maintenance Information Technologies, says the content was sold for the buyer's unlimited use and must not be copied for republication or distribution outside the buyer's company, and gives no warranty of accuracy. Sheets 1 to 3 also carry "COPYRIGHT APPLIED FOR". The scan is image-only.


These sheets are '''not an IBM publication.''' Every title block carries the name '''Maintenance Information Technologies''' and the words "COPYRIGHT APPLIED FOR", together with this notice:
== Contents ==
{| class="wikitable styled-table"
! Sheet !! Title !! Rev !! Date
|-
| 1 || Buss & I/O || 3 || 6/9/91
|-
| 2 || CPU || 4 || 6/13/91
|-
| 3 || Memory || 3 || 6/9/91
|-
| 4 || Printer I/O || 3 || 6/9/91
|-
| 5 || Serial I/O || 3 || 6/9/91
|-
| 6 || Disk I/F & RTC || 3 || 6/9/91
|-
| 7 || Video Interface || 4 || 6/13/91
|-
| 8 || DMA Interface || 3 || 6/9/91
|}


:''"Servicing of any electronic product should only be performed by qualified personnel. This drawing and information has been Copyrighted by the company listed. Its content has been sold for the unlimited use to you. The only restrictions are that it not be copied for republication or distribution outside your company. No patent liability is assumed with respect to the use of information contained herein. Maintenance Information Technologies believes the information herein to be correct. We are not responsible for any typographical errors; no direct or implied warranty is made to its accuracy. Specifications subject to change without notice."''
The drawings carry designators and values for the parts on each circuit. Sheet 6, for example, shows the 8272A diskette controller (U18) and gate array 72X8206 (U14) driving the floppy connector J12, the MC4044 (U39) in the data separator with its filter (R87 and R88 2 kΩ, R90 1.3 kΩ, C79 39 nF, C28 27 nF, C67 68 pF), and the real-time clock circuit: Y4 32.768 kHz with C83 4.7 pF, C84 10 pF, R96 22 MΩ and R97 300 kΩ, the VBAT feed through CR5 (BAV70) with C77 10 µF, and Q4 (MMBT3904) with R70 47 kΩ. On that sheet the clock chip is labelled "U18 8272A A", the same designator and part number as the diskette controller; treat that label with care.


Maintenance Information Technologies was a third-party publisher of service schematics for the independent repair trade in the late 1980s and early 1990s. IBM itself never published a PS/2 schematic.
== What this document does not contain ==
There is no parts list, bill of materials, board layout or power-distribution sheet, so decoupling capacitors are not shown and the set is not a recapping list. It does not state which board revision it was drawn from. It covers the 8086 board only; the Model 30 286 board has its own set, [[:File:IBM PS2 Model 30 286 Schematics.pdf]].


== What it contains ==
== Pages that cite this document ==
 
* [[IBM PS/2 Model 30]] and [[IBM PS/2 Model 30 Capacitor Replacement Guide]] cite it as the Maintenance Information Technologies drawings of the 8086 board.
Eight sheets, each titled "PS/2 30":
* [[IBM PS2 Model 30 Technical Reference (January 1987)]], [[IBM PS2 Model 50 Schematics]] and [[IBM PS2 Model 80 Schematics]] list it as related.
 
# '''BUSS &amp; I/O'''
# '''CPU'''
# '''MEMORY'''
# '''PRINTER I/O'''
# '''SERIAL I/O'''
# '''DISK I/F &amp; RTC'''
# '''VIDEO INTERFACE'''
# '''DMA INTERFACE'''
 
The drawings carry '''real component designators and real values''' &mdash; U-numbers, RP resistor packs, discrete R and C values, connector designators. Sheet 6, for example, shows the floppy subsystem as '''U18 (8272A) and U14 (72X8206)''' feeding connector '''J12''', with '''U39 (MC4044)''' in the data separator and pull-ups '''R99 10&nbsp;k&Omega;''' and '''R87/R88 2&nbsp;k&Omega;'''; the real-time clock oscillator on the same sheet is '''Y4, 32.768&nbsp;kHz''', with '''C83 4.7&nbsp;pF''', '''C84 10&nbsp;pF''', '''R96 22&nbsp;M&Omega;''' and '''R97 300&nbsp;k&Omega;''', and '''Q4 (MMBT3904)''' with '''R70 47&nbsp;k&Omega;''' on the standby side.
 
== What it does not contain ==
 
'''No text layer.''' These are scanned drawings. `pdftotext` returns almost nothing and OCR returns garbled fragments, so read them as page images, not as text.
 
'''No parts list, no bill of materials, no board silkscreen map and no power distribution sheet.''' The component values that are shown are the ones drawn on the signal circuits themselves. Bulk electrolytics and the planar decoupling do not appear, so these sheets will '''not''' give you a recapping list &mdash; but they will give you the value of a specific resistor or small capacitor in a circuit you are tracing, which is more than any IBM publication does.
 
There is no revision history and no statement of which planar revision a Model 30 or Model 50 sheet was drawn from.
 
== What it settles ==
 
'''This is the exception to the rule that no component-level data exists for IBM machines.''' Every IBM service manual on this wiki is module-level and names FRUs, not values. These third-party sheets do carry values on the drawings, so a value you cannot find in any IBM book may well be readable here.
 
Sheet 6 is also the sheet that shows the Model 30's '''real-time clock''' circuit, corroborating from a second, independent source that the 8086 Model 30 has an RTC on the planar &mdash; see [[IBM PS/2 Model 30]].


<pdf> File:IBM PS2 Model 30 Schematics.pdf </pdf>
<pdf> File:IBM PS2 Model 30 Schematics.pdf </pdf>


Download it here: [[:File:IBM PS2 Model 30 Schematics.pdf|IBM PS2 Model 30 Schematics.pdf]]
Download: [[:File:IBM PS2 Model 30 Schematics.pdf|IBM PS2 Model 30 Schematics.pdf]]
 
== Related pages ==
 
* [[IBM PS/2 Model 30]] &middot; [[IBM PS/2 Model 30 Maintenance Guide]] &middot; [[IBM PS/2 Model 30 Troubleshooting Guide]] &middot; [[IBM PS/2 Model 30 Capacitor Replacement Guide]]
* [[IBM PS2 Model 30 Technical Reference (January 1987)]] &mdash; IBM's own reference for the same machine
* [[IBM PS2 Model 50 Schematics]] &middot; [[IBM PS2 Model 80 Schematics]] &mdash; the sibling sets


[[Category:IBM Service Manuals]]
[[Category:IBM Service Manuals]]
[[Category:Service Manuals]]
[[Category:Service Manuals]]

Latest revision as of 21:38, 30 September 2026

The PS/2 Model 30 schematic set is eight sheets of logic drawings of the PS/2 Model 30 (8530, 8086) system board, drawn by a third party, not IBM. Each title block reads "Maintenance Information Technology" and "PS/2 30"; the notice beside it names Maintenance Information Technologies, says the content was sold for the buyer's unlimited use and must not be copied for republication or distribution outside the buyer's company, and gives no warranty of accuracy. Sheets 1 to 3 also carry "COPYRIGHT APPLIED FOR". The scan is image-only.

Contents

[edit | edit source]
Sheet Title Rev Date
1 Buss & I/O 3 6/9/91
2 CPU 4 6/13/91
3 Memory 3 6/9/91
4 Printer I/O 3 6/9/91
5 Serial I/O 3 6/9/91
6 Disk I/F & RTC 3 6/9/91
7 Video Interface 4 6/13/91
8 DMA Interface 3 6/9/91

The drawings carry designators and values for the parts on each circuit. Sheet 6, for example, shows the 8272A diskette controller (U18) and gate array 72X8206 (U14) driving the floppy connector J12, the MC4044 (U39) in the data separator with its filter (R87 and R88 2 kΩ, R90 1.3 kΩ, C79 39 nF, C28 27 nF, C67 68 pF), and the real-time clock circuit: Y4 32.768 kHz with C83 4.7 pF, C84 10 pF, R96 22 MΩ and R97 300 kΩ, the VBAT feed through CR5 (BAV70) with C77 10 µF, and Q4 (MMBT3904) with R70 47 kΩ. On that sheet the clock chip is labelled "U18 8272A A", the same designator and part number as the diskette controller; treat that label with care.

What this document does not contain

[edit | edit source]

There is no parts list, bill of materials, board layout or power-distribution sheet, so decoupling capacitors are not shown and the set is not a recapping list. It does not state which board revision it was drawn from. It covers the 8086 board only; the Model 30 286 board has its own set, File:IBM PS2 Model 30 286 Schematics.pdf.

Pages that cite this document

[edit | edit source]

Download: IBM PS2 Model 30 Schematics.pdf

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