Diagnostic Flow: Coin Rejection Issues
MEI Conlux NBM 3000 SS
Diagnostic Flow: Coin Rejection Issues
This procedure guides troubleshooting when the machine is incorrectly rejecting coins that should be accepted.
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.
- Repeated replacement failures within 30 days: Escalate to manufacturer support
- Because this involves coin handling and potential mechanical blockage, escalate to a qualified technician immediately.
- If the issue continues after initial checks, a qualified technician must assess the coin path and validation components.
Checklist
Guided Diagnostic Steps
Work from low-risk checks toward technician-level inspection only when evidence supports it.
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- 1
Visually inspect the coin path for any obvious obstructions or debris.
operator-intermediatehighVisually inspect the coin path for any obvious obstructions or debris.
FlashlightSample CoinsStop conditions- Because this involves coin handling and potential mechanical blockage, escalate to a qualified technician immediately.
- If the issue continues after initial checks, a qualified technician must assess the coin path and validation components.
Expected: Initial condition is documented before deeper diagnosis.
Evidence to note: note
- 2
Confirm that the coin mechanism is free to move through its entire op...
operator-intermediatehighConfirm that the coin mechanism is free to move through its entire operational range.
FlashlightSample CoinsStop conditions- Because this involves coin handling and potential mechanical blockage, escalate to a qualified technician immediately.
- If the issue continues after initial checks, a qualified technician must assess the coin path and validation components.
Expected: Initial condition is documented before deeper diagnosis.
Evidence to note: note
- 3
Inspect the coin path area for foreign objects.
operator-intermediatehighInspect the coin path area for foreign objects.
FlashlightSample CoinsStop conditions- Because this involves coin handling and potential mechanical blockage, escalate to a qualified technician immediately.
- If the issue continues after initial checks, a qualified technician must assess the coin path and validation components.
Expected: Result is documented before continuing the route.
Evidence to note: note
- 4
Test the coin acceptance function using known good currency.
operator-intermediatehighTest the coin acceptance function using known good currency.
FlashlightSample CoinsStop conditions- Because this involves coin handling and potential mechanical blockage, escalate to a qualified technician immediately.
- If the issue continues after initial checks, a qualified technician must assess the coin path and validation components.
Expected: Result is documented before continuing the route.
Evidence to note: note
- 5
If the issue persists, escalate to a qualified technician for deeper...
operator-intermediatehighIf the issue persists, escalate to a qualified technician for deeper diagnostics.
FlashlightSample CoinsStop conditions- Because this involves coin handling and potential mechanical blockage, escalate to a qualified technician immediately.
- If the issue continues after initial checks, a qualified technician must assess the coin path and validation components.
Expected: Result is documented before continuing the route.
Evidence to note: note
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