Multi-brand
PLC Rack Power Supply Repair (Allen-Bradley SLC / ControlLogix, Siemens) — Mail-In
Component-level repair for PLC rack power supplies: Allen-Bradley SLC 500 and ControlLogix series, Siemens S7 PS units, and similar. Rectifiers, capacitors, and fans are the classic failures. Flat $349 with full load testing.
Coverage: SLC 500 (1746-P1/P2/P3/P4) · ControlLogix (1756-PA72/PB72/PA75/PB75) · Siemens PS307/PS407 · similar rack supplies
✓Fixed — or it's free
Unrepairable units are refunded; evaluations cost $0
✓24-month warranty
Every repair covered, parts and labor
✓3–5 business days bench time
Rush (1–2 day) and emergency service available
✓Program preserved
Your application and settings stay in the unit
Symptoms this repair fixes
- ✓Dead rack / no output
- ✓Rack faults when warm
- ✓Output sag under load
- ✓Audible whine or burnt smell
- ✓Intermittent brownouts and processor faults
Honest limits
- ✕Supplies destroyed by direct lightning/surge events across all boards (evaluated honestly — refund if unrepairable)
What you get
- ▸Component-level repair: rectifier, switching stage, capacitors, fan
- ▸Full electrolytic recap where aging is found
- ▸Load test at rated output before return
- ▸Ripple and regulation verified
- ▸24-month warranty
Typical catalog numbers
Part-number pages for this service
What to ship
- ▸The power supply module only
- ▸Symptom description with your RMA number
Full packing guidance: mail-in instructions.
Ship your unit to
USPS
Control Board Lab
PO Box 120241
Arlington, TX 76012
UPS / FedEx
Control Board Lab
1009 Oakwood Ln # 120241
Arlington, TX 76012
Write your RMA number on the outside of the box and include it on a note inside. Units over 50 lb (large VFDs, spindle drives, industrial PCs in enclosures) ship by freight — contact us before ordering and we will arrange dock-to-dock shipping.
Frequently asked questions
How do I know it's the power supply and not the processor?
A rack that is completely dark, or that faults when warm, is the classic supply failure. If you have a spare supply, a swap test confirms it. If you are unsure, send the supply — if it tests good on load we tell you, charge only the $95 test-and-verify fee, and refund the rest.
These supplies are cheap used — why repair?
Used supplies of this vintage carry the same aged capacitors yours just failed from. A repair replaces the actual wear items with new components, gets load-tested, and carries a 24-month warranty — usually for a similar all-in cost.
Fix it for $349
Buy the repair now, get your RMA instantly, and ship the unit today.
The Fixed-or-Free Guarantee: if we can't repair it, you don't pay for the repair.
Call (817) 799-7332 · 📱 Text us a photo of your unit · Email repairs@controlboardlab.com