Gyro Air G-700Pro: Screen Not Receiving Power — Fuse Inspection & Replacement

Created by Gabriel Izzo, Modified on Tue, 9 Jun at 1:07 PM by Gabriel Izzo

Gyro Air G-700 Pro · Troubleshooting

Screen Not Receiving Power — Fuse Inspection & Replacement

If the G-700 Pro control screen is not powering on and the machine is confirmed to be receiving the required 208V–240V input power with the screen properly connected to the power supply wiring, the issue is most likely related to one or more of the internal control fuses.

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⚡ Warning — Electrical Hazard

Risk of electric shock, serious injury, or death

Disconnect the machine completely from power before opening the electrical box.

Allow several minutes for internal capacitors in the VFD to fully discharge before touching any components.

Never work inside the electrical box while the machine is plugged in or energized.

If you are not comfortable working around electrical components or using a multimeter, consult a qualified electrician or technician before proceeding.

Fuse Locations

There are five fuse holders inside the electrical box. The leftmost fuse is separated from the remaining four by a group of terminal blocks. Reading left to right the order is:

Left to right: 2A · 1A · 500mA · 500mA · 2A

Fuse Specifications

Fuse specifications are printed directly on the end cap of each ceramic fuse. Always verify you are installing the correct fuse type in each terminal location — mismatched fuses can cause premature failures or power issues. The amperage rating varies by circuit position.

Example fuse code breakdown

⌀ 5mm

F2AH250VP

←

F2AH250VP

Printed on end cap

20mm body

F Fast Acting

2A 2 Amp rated

H High Breaking Capacity

250V 250 Volt rating

5×20mm Fuse size

How to Test Fuses with a Multimeter

Remove the fuse from the holder

With the machine fully disconnected from power and VFD discharged, carefully remove the fuse from its terminal position.

Set the multimeter to continuity or resistance mode

Select the continuity mode (usually indicated by a speaker/beep icon) or resistance mode (Ω) on your multimeter.

Touch one probe to each end of the fuse

Place the red probe on one metal end cap and the black probe on the opposite end cap of the fuse.

✓

Good fuse — continuity or very low resistance

The multimeter will beep or display a near-zero resistance reading. The fuse is intact and functioning.

Blown fuse — no continuity or open circuit

The multimeter will show no reading or display "OL" (overload/open). This fuse needs to be replaced with the correct type.

Nuisance Blowing — Leftmost 2A Fuse

If the leftmost 2A fuse blows repeatedly during normal operation

Why This Happens — Inrush Current Spikes

The leftmost 2A fuse protects the control circuit power supply. During startup, electronic control circuits and switching power supplies can draw brief inrush current spikes that momentarily exceed the fuse's rated current — even when no actual fault condition exists.

Because fast-blow fuses are designed to open very rapidly in response to any overcurrent condition, these short-duration spikes from normal power-up sequences can be enough to open the fuse even though the circuit itself is operating correctly. This is known as a nuisance blow — the fuse is responding to a transient rather than a true fault.

Recommended Solution — Switch to a Time-Delay (Slow-Blow) Fuse

If the leftmost 2A fuse blows repeatedly without any other indication of a fault, consider replacing it with a time-delay (slow-blow) fuse of the same amperage and voltage rating.

A time-delay fuse is designed to tolerate brief current surges without opening — it will still protect the circuit from sustained overcurrent conditions, but will not be triggered by momentary inrush spikes during normal startup.

Current (Fast-Blow) Fuse

F2AH250VP

F — Fast acting

2A · 250V · 5×20mm

→

Replacement — Time-Delay Fuse

T2AH250VP

T — Time delay (slow-blow)

2A · 250V · 5×20mm

Important: Only apply this change to the leftmost 2A fuse position. Do not substitute time-delay fuses in other positions without verifying the requirements for each circuit. If nuisance blowing continues after switching to a time-delay fuse, or if the fuse blows immediately upon power-up, this may indicate an actual fault condition — contact Harvey support before proceeding.

Video Walkthrough

The video below covers fuse locations, proper fuse identification, how to test each fuse, and correct replacement positions.

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G-700 Pro Fuse Inspection & Replacement Video

Covers fuse locations · identification · testing · replacement

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If after testing and replacing any blown fuses the issue persists, or if you are unsure about any step, please contact our support team and let us know what you found — we're happy to continue assisting.