HP rp5700 Point of Sale System - Manual (Page 23)

A Troubleshooting
Diagnostics
The printer performs three primary diagnostic tests that provide useful information about the printer’s
operating status:
● Startup diagnostics, performed during the printer’s startup cycle
● Runtime diagnostics
● Remote diagnostics, maintained during normal operation and reported in the print test
Startup Diagnostics
When the printer receives power or performs a hardware reset, it automatically performs the startup
diagnostics (also known as level 0 diagnostics) during the startup cycle. The printer:
● Turns off the motors
● Performs boot CR check of the firmware ROM, test external SRAM, test EEPROM, and test
main program CRC
Failure causes startup diagnostics to stop; the printer beeps and the LED flashes a set number of
times, indicating the nature of the failure. The following table describes the specific tone and LED
sequences.
LED Behavior Failure
One blink Boot CRC error
Two blinks RAM failure
Three blinks EEPROM failure
Four blinks Memory initialization failure
To resolve:
● Check if paper is present
● Return the knife to the home position; failure causes a fault condition
● Check if the rear cover is closed; failure does not interrupt the startup cycle
When the startup diagnostics are complete, the printer makes a two-tone beep (low then high
frequency), the paper feed button is enabled, and the printer is ready for normal operation.
If the printer has not been turned on before, or a new EEPROM has been installed, the default values
for the printer functions will be loaded into the EEPROM during startup.
ENWW Diagnostics 17