Macintosh LC 575
The Macintosh LC 575 is an all-in-one 68LC040-based Macintosh that was released in February 1994.
Specifications
| Spec | Details |
|---|---|
| Release Date | February 1994 |
| Discontinuation Date | April 1995 |
| Processor | Motorola 68LC040 @33MHz FPU: None Bus Speed: 33MHz |
| RAM | 1x 72-pin SIMM Slot - 5 or 8MB Standard - 36MB Maximum |
| Hard Disk | 3.5" SCSI - 160 or 320MB Standard |
| Graphics | 14" Color Trinitron CRT @640x480 - 512KB or 1MB VRAM |
| Audio | Stereo Speakers |
| Internal Drives | Manual-inject 3.5" 1.44MB Floppy Drive 2X CD-ROM Drive |
| Expansion | - 1x LC PDS Slot - 1x Comm Slot |
| Networking | Optional internal modem or ethernet |
| Other I/O | - 1x ADB - 2x Serial - 1x DB25 SCSI - 1x DB-15 Video Out (optional expansion card) - 1x Line Out - 1x Mic In - 1x Headphone Out |
| PRAM Battery | 4.5V Alkaline Block Battery |
| Original Mac OS | System 7.1 |
| Maximum Mac OS | Mac OS 8.1 |
Upgrades
CPU Upgrade
The LC 575's processor was socketed and could be easily upgrade to a full 68040 chip with an FPU. PowerPC accelerators were also available.
SSD Upgrade
Check our page on SCSI SSD replacements for more info.
Resources
 Service Manual |
 Logic Board Schematic |
Capacitor Reference |
|---|
Common Faults & Maintenance
PRAM Battery Leaks
The Macintosh LC 575's Alkaline PRAM battery is highly prone to leaking and should absolutely be removed. The LC 575 does not need a working battery to boot.
Capacitors
The LC 575's logic board has several surface-mount electrolytic capacitors on it that leak corrosive fluid with age. These must be replaced for reliable operation.
The LC 575's analog board also sometimes needs recapping.
Brittle Plastic
The 575's case plastics are now extremely brittle. They will not survive shipping 90% of the time, even if packed very well. Handle with extreme care at all times.
The plastics also yellow with age.
Other Notes
Most original SCSI hard drives for these have gone bad, especially those made by Quantum, which suffer from sticky rubber bumpers in the head assembly.
Page last updated (MM/DD/YYYY): 03/11/2025
Update Reason: page rewritten
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