No Power / Dead Machine Troubleshooting
VendnetUSA NBM 3000 Serie
No Power / Dead Machine Troubleshooting
This process systematically verifies the entire power chain, from the building's main electrical source down to the internal control unit's readiness.
Qualified technician handoff: stop before live electrical testing, sealed-system refrigeration work, compressor service, or protected-compartment access unless a qualified technician is handling the work.
- Line voltage found at power supply input but no DC output: Stop testing. Hand off to licensed technician for power supply replacement.
- If line voltage is found at the power supply input but no DC output is present, stop testing immediately and hand off to a qualified technician for power supply replacement.
- If the issue persists after initial checks, escalate to a qualified technician for advanced electrical diagnostics.
Checklist
Guided Diagnostic Steps
Work from low-risk checks toward technician-level inspection only when evidence supports it.
You can read or print the route now. The first checkbox click opens the service contact gate.
- 1
Safely test the wall outlet to confirm building power is present usin...
operator-intermediatehighSafely test the wall outlet to confirm building power is present using a known good tool or multimeter.
Digital MultimeterFlashlight or Work LightStop conditions- If line voltage is found at the power supply input but no DC output is present, stop testing immediately and hand off to a qualified technician for power supply replacement.
- If the issue persists after initial checks, escalate to a qualified technician for advanced electrical diagnostics.
Expected: Initial condition is documented before deeper diagnosis.
Evidence to note: note
- 2
Visually inspect the main power input area for obvious signs of disco...
operator-intermediatehighVisually inspect the main power input area for obvious signs of disconnection or damage.
Digital MultimeterFlashlight or Work LightStop conditions- If line voltage is found at the power supply input but no DC output is present, stop testing immediately and hand off to a qualified technician for power supply replacement.
- If the issue persists after initial checks, escalate to a qualified technician for advanced electrical diagnostics.
Expected: Initial condition is documented before deeper diagnosis.
Evidence to note: note
- 3
Safely test the wall outlet to confirm building power is present usin...
operator-intermediatehighSafely test the wall outlet to confirm building power is present using a known good tool or multimeter.
Digital MultimeterFlashlight or Work LightStop conditions- If line voltage is found at the power supply input but no DC output is present, stop testing immediately and hand off to a qualified technician for power supply replacement.
- If the issue persists after initial checks, escalate to a qualified technician for advanced electrical diagnostics.
Expected: Result is documented before continuing the route.
Evidence to note: note
- 4
Check the main power input connections for visible damage.
operator-intermediatehighCheck the main power input connections for visible damage.
Digital MultimeterFlashlight or Work LightStop conditions- If line voltage is found at the power supply input but no DC output is present, stop testing immediately and hand off to a qualified technician for power supply replacement.
- If the issue persists after initial checks, escalate to a qualified technician for advanced electrical diagnostics.
Expected: Result is documented before continuing the route.
Evidence to note: note
- 5
If power is confirmed, proceed to check the low voltage power supply...
operator-intermediatehighIf power is confirmed, proceed to check the low voltage power supply connections for a qualified technician.
Digital MultimeterFlashlight or Work LightStop conditions- If line voltage is found at the power supply input but no DC output is present, stop testing immediately and hand off to a qualified technician for power supply replacement.
- If the issue persists after initial checks, escalate to a qualified technician for advanced electrical diagnostics.
Expected: Result is documented before continuing the route.
Evidence to note: note
- 6
Stop the public checklist here and document the machine state for tec...
operator-intermediatehighStop the public checklist here and document the machine state for technician review.
Digital MultimeterFlashlight or Work LightStop conditions- If line voltage is found at the power supply input but no DC output is present, stop testing immediately and hand off to a qualified technician for power supply replacement.
- If the issue persists after initial checks, escalate to a qualified technician for advanced electrical diagnostics.
Expected: Result is documented before continuing the route.
Evidence to note: note
Tools for this route
Location Help
Where to find this
Use this as orientation before touching the machine. It is location help, not a repair instruction.
Start at the affected product shelf or selection row; compare the tray, coil, and product path with a nearby working selection.
- Main interface for building power connection to the vending machine.
- Power cord
- Line filter
- Main fuse or breaker
Do not open energized or protected electrical areas unless a qualified technician or licensed electrician is handling the work.
cabinet glass front
control board generic
vend motor
power supplyParts status
Exact public parts list not verified yet. Use this route to identify the system before ordering.
Candidate areas for part verification
Other Possible Issues
Switch routes if this symptom is not the closest match.