Description
Radius 915-0028 Macintosh Power Supply Motorola PSM-7458-52 For Parts
The Radius 915-0028 is an open-frame internal switching power supply board, OEM-manufactured by Motorola under part number PSM-7458-52, designed for use in Apple Macintosh computers sold with Radius video expansion hardware. The board outputs multiple DC voltage rails via a wiring harness with bare leads and a connector block, feeding the host Macintosh system. This is a vintage unit and is being offered for parts or repair only.
Specifications & What's Included
- Manufacturer Part Number: 915-0028 (Radius Inc.)
- OEM Part Number: PSM-7458-52 (Motorola)
- Type: Open-frame internal switching power supply board
- Input: 120V AC, 0.9A (per label visible on board edge)
- Form Factor: Open-frame PCB module with integrated heat sink
- Output: Multi-wire DC harness with spade terminals and connector block
- Capacitors: Nicon 200µF 35V electrolytic capacitors (multiple, visible on PCB)
- Yellow ferrite transformer present on PCB
- Heat sink: Stamped aluminum, mounted over main switching transistors
- PCB: Green, single-board assembly with four rubber standoff feet
- Included: Power supply board with attached wiring harness — no enclosure or mounting hardware
Applications
Radius Inc. was a prominent third-party Apple Macintosh peripheral and display manufacturer active through the late 1980s and 1990s. The company produced video accelerator cards, two-page displays, and all-in-one Macintosh upgrades that required supplemental power delivery, and Motorola supplied OEM power supply assemblies for these configurations. This board would have been an internal component in a Radius-upgraded Macintosh workstation or a Radius-branded display/monitor unit — providing regulated DC power to the Radius expansion hardware alongside or in place of the stock Macintosh power supply. Replacement and repair parts for vintage Radius and classic Macintosh systems remain sought after by collectors, restorers, and technicians working to maintain late-1980s and early-1990s Mac hardware. This unit dates from that era of classic 68k-based Macintosh computing.
This Radius 915-0028 / Motorola PSM-7458-52 Macintosh power supply board is being sold as-is for parts or repair. Due to its age, we are not able to confirm functionality and it is not tested. The board appears visually intact — the green PCB is clean with no obvious cracked or burned components, the heat sink is present and secure, and the attached wiring harness is complete with spade terminals and connector block. Nicon electrolytic capacitors are visible on the board and appear intact. This is a vintage unit and buyers should expect age-appropriate condition throughout. Please view our photo set and contact us if you have any questions.
Warranty Information
Additional Information
Brand: |
Radius |
Model: |
915-0028 |
MPN: |
915-0028 |
Secondary Model: |
PSM-7458-52 |
Type: |
Internal Macintosh Power Supply Board |
SKU: |
41695 |
Condition: |
As-Is / For Parts or Not Working |
Compatible With: |
Apple Macintosh (Radius-equipped models) |
Input Voltage: |
120V AC, 0.9A (per label visible in photos) |
Form Factor: |
Open-Frame PCB / Internal Module |
Output Connector: |
Wiring harness with bare leads and connector |
Seller Notes: |
Sold as-is for parts or repair. Includes attached wiring harness. |
Country/Region of Manufacture: |
United States |
Condition Notes: |
Radius 915-0028 / Motorola PSM-7458-52 vintage Macintosh power supply board. Sold as-is for parts or repair — not tested, no functionality guarantee. Board appears visually intact with heat sink and wiring harness present. |
