FANUC · FANUC power supply modules
A06B-6077-H111 Repair
FANUC alpha power supply module PSM 11kW (A06B-6077-H111). The shared single point of failure for the whole servo rack — rectifier, precharge, bus capacitors, and control supply repaired with free evaluation.
Known failures on the A06B-6077-H111
- ▸PSM alarm LEDs / no ready
- ▸Whole servo system dead
- ▸Breaker trips at power-up
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.
Check these before you ship
Some of these will tell you the A06B-6077-H111 is fine and the fault is elsewhere — worth ten minutes before you pay to ship it.
- □Measure the output under real load, not disconnected. A supply that reads correct at idle and sags in the rack is the single most common industrial power-supply fault, and it is invisible on a bench meter with nothing connected.
- □Check whether the rack is drawing more than the supply is rated for. Modules added over the years quietly push some racks past their original supply budget.
- □Look for the physical evidence: bulged or vented capacitor tops, heat discoloration, or a burnt smell. It is not a diagnosis on its own, but it tells us where to start.
- □Note whether it fails from cold, only when warm, or only under a particular machine state. Thermal-dependent failures point straight at capacitor and regulation problems.
Not your exact model?
Search the catalog or send us the number on your unit's label — we service far more than the catalog shows.
How the A06B-6077-H111 differs from the rest of the FANUC power supply modules range
These share an electronics platform and fail in the same ways, but they are not interchangeable — check the number on your unit's label against this list before you ship, and before you buy a replacement.
| Part number | Distinguishing spec | Repair | |
|---|---|---|---|
| A06B-6077-H111 (this page) | FANUC power supply modules | Free evaluation — typical repairs $500–$1,200 | |
| A06B-6077-H106 | FANUC power supply modules | Free evaluation — typical repairs $500–$1,200 | View → |
| A06B-6087-H126 | FANUC power supply modules | Free evaluation — typical repairs $500–$1,200 | View → |
| A06B-6087-H130 | FANUC power supply modules | Free evaluation — typical repairs $500–$1,200 | View → |
| A06B-6110-H011 | FANUC power supply modules | Free evaluation — typical repairs $500–$1,200 | View → |
Why a A06B-6077-H111 fails — and what we do about it
The FANUC power supply modules shares its electronics across the family, so these are the faults we see on this part number again and again.
Pre-charge circuit failure
- What you see
- The module will not bring the bus up, or alarms immediately on power-up.
- Why it happens
- The soft-charge circuit that limits inrush while the bus capacitors charge — the resistor and its bypass contactor or relay — is a genuine wear item, and its failure stops the bus reaching working voltage.
- What we do
- The pre-charge path is tested and repaired, then correct bus charging is verified through a controlled power-up sequence.
DC bus capacitor degradation
- What you see
- Undervoltage alarms across multiple axes, or faults that appear under heavy machining load.
- Why it happens
- The supply module feeds every drive on the machine, so degraded bus capacitors produce faults that appear to come from several axes at once and are routinely misdiagnosed as multiple drive failures.
- What we do
- The capacitor bank is assessed and replaced and bus stability verified under load.
Repair or replace a A06B-6077-H111?
Power supplies are inexpensive relative to what they take down with them, and they fail in a way that is genuinely worth repairing: predictably, in the capacitors and switching section, with a well-understood fix and a long service life afterwards. The case for repair is strongest where the supply is discontinued, where it is an odd form factor that fits one specific rack, or where you want a maintained spare of a unit you already trust. A repaired and load-tested supply is a far better spare than an untested surplus one.
Full technical detail for this repair
The FANUC Power Supply (PSM) service page covers the complete bench sequence — how the unit is tested, what gets replaced and how it is proven before it ships back — along with the rest of the family we service.
FANUC Power Supply (PSM) Repair — full details →Frequently asked questions
Can the A06B-6077-H111 be repaired?
Yes — psm alarm leds / no ready, whole servo system dead, breaker trips at power-up are the failures we commonly repair on the FANUC power supply modules platform. It starts with a free bench evaluation and a firm quote you approve before any work — $0 if unrepairable.
How long does a A06B-6077-H111 repair take?
Standard bench time is 3–5 business days once the unit arrives. Rush service (+$149) moves it to 1–2 business days, and emergency same/next-day attempts are available — contact us first.
How do I send it in?
Start the repair online to get an RMA number instantly, pack the unit well with the RMA on the box, and ship it to our Dallas–Fort Worth lab with any carrier. Full packing guidance is on the mail-in instructions page.
Machine down? Let's get it back up.
Start a repair online in two minutes, or send us the part number for a free technician review.
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