Xerox ColorQube 8570 Service Manual page 51

Detected POST Faults
Table 1 lists possible detected errors and their associated fault codes.
NOTE: POST error 226 can indicate blown Fuse F501 in the Electronics Module, or Control
Panel is unplugged or its cable is damaged.
Table 1 POST Error Type
Description
POST_BAD_ERROR_CODE
POST_RTC_READ_FAILURE
POST_RTC_WRITE_FAILURE
POST_RTC_REREAD_FAILURE
POST_RTC_NOT_TICKING
POST_RTC_TRICKLE_CHRG_FAILURE
POST_EEPROM_READ_FAILURE
POST_EEPROM_WRITE_FAILURE
POST_EEPROM_REREAD_FAILURE
POST_EEPROM_DATA_FAILURE
POST_RAM_INSUFFICIENT
POST_FP_LINK_INVALID
POST_FP_WONT_INIT
POST_FP_DATA_PATH_FAILURE
POST_PROG_MACHINE_CHECK
POST_FPGA_LOAD_FAILURE
POST_FPGA_ID_READ_FAILURE
POST_FPGA_ID_MISMATCH
POST_FPGA_WRITE_MISMATCH
POST_FPGA_INTERRUPT_FAIL
POST_FPGA_ACCESS_FAIL
Xerox Internal Use Only - Revised, 3rd Revision
ColorQube 8570/8870 Service Manual
Sequence
The following sequence describes the operational steps just prior to, during, and just after the
loading of POST stand-alone code. Whenever any of the following sequence steps fail, POST
will halt at the failed test, writes the failed test fault code to the Control Panel LCD and flashes
the Control Panel LED with the associated blink code.
1. When power is turned on, the Control Panel LED is turned off and dim. The Control Panel
LCD is blank.
Fault Code
2. The Boot loader is run.
211
3. The Boot loader loads the flash image of FPGA.
212
4. The Boot loader loads and runs the POST stand-alone code.
213
5. POST turns on the Electronics Module Fan full. The Fan remains on until the Engine
214
region is loaded and PEST takes over control of the Fan.
215
6. POST checks the load status of FPGA.
216
7. POST turns LEDs off.
217
8. POST checks if the Control Panel link is valid.
218
a.
219
221
222 b.
223 9. POST attempts to read config space by reading FPGA's vendor ID.
225 10. POST attempts to read and write a defined FPGA register.
226 11. POST attempts to interrupt FPGA.
227 12. POST attempts EEPROM tests.
228 13. POST attempts Real Time Clock tests.
229 14. POST checks RAM size.
231 15. POST sets the Control Panel LED on green.
232 16. POST stand-alone code exits and returns control back to the Boot loader.
233 17. The OS is loaded.
234 Print Engine Self-Test
Print Engine Self-Test (PEST) tests components if they are drawing power. PEST tests occur
after POST tests have been run and PostScript has been initialized. PEST checks the connec-
tions and operation of various components. PEST runs as part of the print engine.
PEST Error Reporting
Fault codes for PEST are displayed on the Control Panel and are in the 99,XXX series. For
troubleshooting PEST fault codes, see
October 2012
2-5
If valid attempt to initialize the Control Panel. Verify LCD data connection is OK. Dis-
play Control Panel header. POST checks for POST Cancel button from the Control
Panel. If cancel received, exits POST and return control back to the Boot loader.
If invalid skips initializing the Control Panel.
Fault Messages and Codes Troubleshooting.
Fault Messages and Codes
Power On Self Tests