Tools for troubleshooting
The section describes the tools that can help solve problems with the product.
Individual component diagnostics
LED diagnostics
LED, engine, and individual diagnostics can identify and troubleshoot product problems.
Understand lights on the formatter
Three LEDs on the formatter indicate that the product is functioning correctly.
NOTE: The formatter for the M651 product is shown in the figure below, but the LEDs are in the same
position for the M680 product.
1
2
3
1Heartbeat LED
2 Connectivity LED
3 HP Jetdirect LEDs
Connectivity LED
The connectivity LED provides information about product operation. If a product error occurs, the formatter
displays a message on the control-panel display. However, error situations can occur causing the formatter-
to-control panel communication to be interrupted.
NOTE: HP recommends fully troubleshooting the formatter and control panel before replacing either
assembly. Use the connectivity LED to troubleshoot formatter and control panel errors to avoid
unnecessarily replacing these assemblies.
140 Chapter 2 Solve problems ENWW
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