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error HP
Error Code Ready light not on
Control panel should indicate ready status. No lights are on, indicating a power or connection issue.
? What Causes This
Power connections faulty; voltage problems; cabling issues.
✓ How to Fix It
Check power cable, ensure correct power specifications met, seek support if unresolved.
Source: page 169 of the official manual
From the manual
This error code appears in:
HP Laserjet Enterprise 600 Printer M601