Macintosh Repair & Upgrade Secrets

The Macintosh Repair & Upgrade Secrets held here is Larry Pina's book, published under the Hayden Books imprint of Macmillan Computer Publishing, first edition, second printing, 1990, ISBN 0-672-48452-8, Library of Congress card number 89-63715. The scan is 365 pages.

This is the most component-level Apple-family document on this wiki. Unlike Apple's own Service Source volumes, which stop at module level, this book prints four complete component parts lists for compact Macintosh analogue boards, with values, working voltages, working temperatures, package types and the original manufacturer for every position.

The four parts lists

• Appendix C — Parts List, Macintosh Analog Board, U.S. Version (book p. 327)
• Appendix D — Parts List, Macintosh Analog Board, International Version (book p. 335)
• Appendix E — Parts List, Macintosh SE Analog Board (book p. 341)
• Appendix F — Parts List, Macintosh SE CRT Socket Board (book p. 345)

Each list is broken into CAPACITORS, INDUCTORS, RESISTORS, SEMICONDUCTORS and MISCELLANEOUS. The capacitor columns are Ref. / Cap. / WV / WTemp. / Type / OEM, and rows marked "ok" give Pina's acceptable substitutes. The semiconductor tables cross-reference the OEM part to a Philips ECG number and, where one exists, a Radio Shack number.

The finding that matters most: the U.S. and International boards are not the same board

The two analogue boards use the same designators for different components. Reading a value across from one list to the other will put the wrong part in the board. Verified against the printed pages:

Ref.	U.S. board (Appendix C)	International board (Appendix D)
C13	33 µF 16 V 85 °C aluminium electrolytic	0.01 µF 1.5 kV ceramic disc
C25	1000 µF 16 V 105 °C electrolytic	0.022 µF 400 V metallised film
C34	330 pF 1 kV ceramic disc	100 µF 200 V 85 °C electrolytic
C42	0.1 µF metallised film	470 µF 10 V 85 °C electrolytic

A compact-Macintosh capacitor table that does not say which regional analogue board it is for is unusable, and one that mixes the two is dangerous — C13 alone is the difference between a 16 V electrolytic and a 1.5 kV ceramic.

Both boards carry RIFA "molded minibox" suppression capacitors: on the U.S. board C33 and C37 (4700 pF 250 V) and C38 (0.1 µF 250 V); on the International board C33 and C36 (4700 pF 250 V) and C37 (0.47 µF 250 V). These are the parts that crack, smoke and smell of fish.

Both boards also carry large mains-side electrolytics at 100 µF 200 V (U.S. C35/C36; International C34/C35/C38/C39). A part rated below that is the wrong part.

Designators differ by region in the text too

The chapter headings themselves record the shift: "Testing Q3 (INTERNATIONAL Q2) Out-of-Circuit" and "Replacing Q3 (INTERNATIONAL Q2)" (book pp. 100–101), and elsewhere Q11 on the U.S. board is Q10 on the International board. Pina warns explicitly: "Be sure to look in the right appendix! Appendix C is for U.S. analog boards. Appendix D is for International analog boards."

Contents

• 1 — Safety Rules, Tools and Techniques (p. 1)
• 2 — Preliminary Checks (p. 19)
• 3 — Adjustments (p. 41)
• 4 — Power Supply Problems (p. 55) — including fluctuating voltage, the harness,

 cleaning and treating board connectors, focus control problems (burned resistors → no focus),
 loose or corroded contacts on the CRT socket cable, tarnish on the CRT pins, brightness control

• 5 — Video Problems (p. 81) — display collapses to a vertical line (cracked solder

 joints, C1 failure), jitters/ringing/ozone smell/"worms" in the display, identifying and
 replacing the flyback transformer, severe distortion, burning smell, no raster, collapse to a
 horizontal line, collapse to a pinprick

• 6 — Dead Sets (p. 109) — visual inspection, checking resistor values, reading the colour code
• 7 — Power Supply Upgrades and Fans (p. 125), with a "Parts List for Maximum Analog Board

 Upgrade" giving Ref. / Check for / Change to

• 8 — Audio Upgrades (p. 145)
• 9 — Video Upgrades (p. 159)
• 10 — Disk Drive, RAM, ROM and SCSI Upgrades (p. 175)
• 11 — Keyboard Repairs (p. 207)
• 12 — Mouse Repairs (p. 223)
• 13 — Lisa/Macintosh XL Repair Secrets (p. 235)
• 14 — Macintosh SE Repair Secrets (p. 281)
• Appendix A Glossary (p. 313), B Dealer/Manufacturer Addresses (p. 323), C–F the four parts lists

What it does not cover

• No schematic. The parts lists give values and board references, not circuit topology.
• Nothing later than the Macintosh SE. There is no Macintosh II, no LC, no Classic and no

 Colour Classic here; for the Mac II see Macintosh II Repair and Upgrade Secrets.

• No coverage of logic-board faults beyond swap-level.
• It is a secondary source, not Apple's. The values are Pina's own survey of the boards he

 had; where Apple published a figure, cite Apple. Apple published no such figures for these boards.

What it settles

• The Macintosh PRAM cell is genuinely 4.5 V: Appendix D's MISCELLANEOUS table lists

 B1, Eveready 523, 4.5 V battery. That matches the Service Source specification and
 confirms the cell is alkaline, so leakage is neutralised with vinegar rather than bicarbonate.

• The compact Macintosh CRT in the SE is a Samsung type 10ATY4N white antiglare tube

 (Appendix E, MISCELLANEOUS).

• Component-level data for these boards does exist, contrary to what the module-level Apple

 manuals imply. It is here, and it has never been cited from the wiki's compact-Mac pages.

Pages that cite this document

• Macintosh 128K/512K Capacitor Replacement Guide — the U.S./International split and the four parts lists
• Macintosh SE Capacitor Replacement Guide — Appendices E and F
• Macintosh Plus Capacitor Replacement Guide
• The Dead Mac Scrolls — the same author's symptom-to-part reference
• Macintosh II Repair and Upgrade Secrets — the companion volume for the Mac II

Working on a compact Macintosh analogue board means working on a live mains supply and a charged CRT. Follow CRT Discharge Procedure first.

Download: Macintosh_Repair_&_Upgrade_Secrets.pdf (63.2 MB)