# NVA FAQ - Trouble Shooting

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Safety reminder

Keep cutting power OFF during alignment; use the red guide light only and follow site laser-safety procedures.
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#### Q1. Web interface freezes or becomes unresponsive

**Action**

a) Refresh the page (hard refresh Ctrl/Cmd+Shift+R).

b) Close & reopen the browser tab.

c) Reboot NVA, then reconnect to its Wi-Fi and retry.

***

#### Q2. Device does not power on after installing batteries

**Check**

a) Batteries must be 14500 Li-ion, 3.7 V, button-top (rechargeable).

b) Install two cells with polarity (+/–) correct (positives toward the compartment cover).

c) Charge the batteries; if unsure, use USB-C power (power bank/adapter) and test again.

***

#### Q3. Cleaning a contaminated outer protective lens

**Method**

a) Use dedicated lens-cleaning fluid, cotton swabs, and a lint-free cloth.

b) Wipe gently in one direction; avoid scratching or using household solvents.

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#### Q4. Nozzle aperture fails circular fitting

**Corrective steps**

a) Improve nozzle image clarity (focus/height, clean optics).

b) Keep the nozzle centered in the imaging field.

c) Replace with a clean, undamaged nozzle if contamination persists.

d) Ensure the red dot is focused and fully within the aperture.

***

#### Q5. NVA Wi-Fi not detected for an extended period after startup

**Check**

a) Refresh the phone’s Wi-Fi list / toggle Wi-Fi off–on.

b) Check the NVA status LED: Green = normal, Red = low battery (charge required).

c) If using external power, ensure the adapter’s USB-A port supports 5 V / 3 A (see Section 2.5) and use the included USB-C cable.

***

#### Q6. Interface unresponsive or Wi-Fi repeatedly drops/reconnects

**Likely cause & fix**

a) Low power: Red LED → charge immediately or use a compliant adapter.

b) Power adapter must support 5 V / 3 A; if not, replace with a Section 2.5–compliant adapter and use a single-ended USB-C data/power cable (avoid 3-in-1 cables).

***

#### Q7. Camera feed latency

**Reduce lag**

a) Keep the phone within ≤ 1.5 m of NVA.

b) Refresh the web interface before re-testing.

c) Close background apps; avoid strong 2.4 GHz interference sources nearby.

***

#### Q8. Wi-Fi connected but cannot open the alignment page

**Steps**

a) Verify the URL and port in English input mode: <http://192.168.0.1:8088> (note http, not https).

b) Disable cellular data/VPN/Private DNS temporarily and retry.

c) Renew DHCP lease or toggle Wi-Fi off–on; if still blocked, set Static IP (e.g., IP 192.168.0.2, Mask 255.255.255.0, Router 192.168.0.1) and retry.

d) Use a mainstream browser (Chrome or Edge).

***