HP laserjet m712 Fehlerbehebungsanleitung
Formatter to control panel communication interruptions
●
The firmware does not fully initialize and configure the control panel interface.
●
The control panel is not functioning (either a failed assembly or power problem).
●
Interface cabling between the formatter and control panel is damaged or disconnected.
TIP:
If the connectivity LED is illuminated, the formatter is fully seated and the power is on. The pins
for the LED circuit in the formatter connector are recessed so that this LED will not illuminate unless the
formatter is fully seated.
The heartbeat LED operates according to the product state. When the product is initializing, see
Heartbeat LED, product initialization
The following table describes the heartbeat LED operation while the product is executing the firmware
boot process.
NOTE:
When the initialization process completes the heartbeat LED should be illuminated solid green
—the LED is off if the product is in Sleep Mode.
Table 2-8
Heartbeat LED, product initialization
Product initializing
state
state
Heartbeat LED, normal state
Heartbeat LED, error state
No power (power cable
disconnected or power
switch off)
disconnected or power
switch off)
Off
Not applicable
Power on (immediately
after the power switch
pressed)
after the power switch
pressed)
Red, solid
●
Duration should be 1 second or less
Red, solid
●
Firmware error; problem finding hardware
and booting the serial peripheral interface
flash memory
and booting the serial peripheral interface
flash memory
◦
Boot process halted
Replace the formatter.
Serial peripheral
interface (SPI) flash
memory boot
interface (SPI) flash
memory boot
Green, solid
Red, solid
●
Firmware error; problem corrupt or missing
SPI flash memory
SPI flash memory
◦
Boot process halted
Replace the formatter.
HW checks on board
DRAM
DRAM
Green, solid
Red, solid
●
Power on self check failure
◦
Boot process halted
Replace the formatter.
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Chapter 2 Solve problems
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