Complete topology
AC filter, half-bridge primary, transformer-coupled gate drive, secondary rectification, regulation, power-good logic, and fan/LED interfaces documented as one system.
Retro Mac Lab Press - First Edition
Sony CR-45 Power Supply of the Macintosh II
A complete technical reference and restoration guide for the original Sony CR-45, Sony model 68-1073-5: the rare Macintosh II supply that never received public service documentation.
- 223
- active components
- 350+
- photos
- 30
- chapters
- 5
- DNP positions
The book
The original CR-45, finally documented as a working system.
The Sony CR-45 powered the original 1987 Apple Macintosh II. For decades, restorers had no public schematic set, no component roster, no verified netlist, and no reliable theory of operation for this specific supply.
This reference closes that gap with source-grounded reverse engineering: complete schematics, a verified populated roster, inter-board connection maps, restoration procedures, bench-test guidance, and a practical explanation of how the supply starts, regulates, protects itself, and fails.
This is the original Sony CR-45, Sony model 68-1073-5. It is not the later Sony CR-45S, model 68-1089-03.
Inside the reference
Built for restorers who need the actual circuit, not folklore.
Verified component roster
223 active populated components plus 5 documented phantom or DNP positions, reconciled through the current Master Component Register.
Restoration procedures
Safety-first teardown, capacitor replacement, startup checks, load testing, trim guidance, and fault-isolation notes for real bench work.
Bench evidence
Measurements, continuity traces, scope captures, ripple analysis, and photo-backed corrections are carried into the published explanation.
Variant discipline
The book distinguishes the original CR-45 from the CR-45S and Astec alternatives by model evidence, not by ambiguous Apple part-number shorthand.
Modern replacement context
Where original parts are obsolete, the guide explains package, rating, function, and substitution constraints instead of reducing restoration to a parts list.
Sample pages
A look at the kind of evidence inside.
Connection map
Four physical boards, one traced power system.
The reference treats the CR-45 as a connected assembly: main board, PWM daughter board, AC filter board, and LED/status board. Inter-board signals are tracked through connectors and actual board evidence.
CR-45 at a glance
Public-facing facts, kept variant-safe.
Sony model
68-1073-5
Apple part number
699-0389
Host computer
Apple Macintosh II
Supply family
Sony CR-45
Topology
Half-bridge forward converter
Output rails
+5 V, +12 V, -12 V
Documented roster
223 active parts + 5 DNP positions
Book scope
30 chapters, 350+ photos
Apple part numbers alone are not a reliable variant discriminator for Macintosh II power supplies. This site identifies the original CR-45 by Sony model number.
Availability
Check Amazon, or join the launch list.
Use the ISBN search now, or send a launch-list email if you want the direct listing once Amazon publishes it. No account sign-in or tracking form is involved.