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error HP
Error Code Machine does not print; check power connections and settings
The machine isn't printing, likely due to improper power or port configuration.
? What Causes This
Disconnected cables, faulty connection, incorrect printer default setting.
✓ How to Fix It
Verify all electrical connections and switch on电源供应。确保机器已设置为默认打印机并连接到正确的端口。
Source: page 140 of the official manual
From the manual
This error code appears in:
HP Laserjet Mfp M438