Zk-pp2k Manual Extra Quality < 2027 >

| Error Code / Symptom | Meaning | Fix | | :--- | :--- | :--- | | | Template mismatch or dirty sensor | Clean sensor, re-enroll finger using consistent pressure. | | “Enroll failed - duplicate” | Finger already registered to another ID | Find the existing user via User Management > Search and delete or change ID. | | “Comm. failed” (PC cannot find device) | IP mismatch or firewall blocking | Ping the device IP from PC. Disable Windows firewall temporarily. Ensure both are on same subnet (e.g., 192.168.1.x). | | “Memory full – logs” | Internal storage has reached 80,000 logs | Download logs to PC, then Menu > Data Management > Delete Logs . | | “Clock error – battery low” | Internal RTC coin cell battery is dead | Replace CR2032 battery on mainboard (requires opening device – warranty void if done by non-technician). | | Screen frozen / boot loop | Corrupted firmware or power glitch | Perform a factory reset (see below) or reflash firmware via USB (contact support). |

The device operates in two distinct modes. You can toggle between them by . Mode 1: PWM Mode (Display: "%") In this mode, the device outputs a continuous square wave.

: Allows for complex sequencing by setting specific positive/negative pulse widths, power-on delay times, and a specific number of pulses (1–9999 or infinite). High Power Output