Gp 19 Boot Sequence - Xerox workcentre 5335 series Service Manual

GP 19 Boot Sequence

Procedure
Assessment on the condition of the parts and the condition of the ESS PWB can be done
based on the ON/OFF states of the 8 LED's on the ESS PWB. To check the condition of an
error where no Error Code is displayed, check the LED display on the ESS PWB.
As the device that can be connected differs depending on the board, it does not always mean
that diagnostic is possible. In the following table, items that are installed as features are
marked with "O".
Purpose
1. Turn the power switch OFF, make sure that the screen display turns OFF, then turn the
main power switch OFF.
2. Unplug the power cord from the outlet.
3. Remove the ESS Cover.
4. Plug in the power cord, turn ON the main power switch, then turn ON the power switch.
Check
Check the ESS PWB LED ON/OFF states, refer to
ESS PWB LED's 0, 1, 2, 3 are Green; 4, 5, 6, 7 are Yellow.
Main Unit Main Unit
Lower Upper
7,6,5,4 3,2,1,0 State/Condition
O,O,O,O O,O,O,O Initial state at Power ON
x,x,x,x x,x,x,O Interrupt vector setting com-
pleted
x,x,x,x x,x,O,x EBC (ROM Controller) initial-
ization completed
x,x,x,x x,O,x,O D-Cache zero clear
x,x,x,x x,O,O,O DDR output buffer is enabled
Software wait processing
x,x,x,x O,x,x,x DDR Controller usual initial-
ization start
O,x,x,x O,x,x,x Recovery processing from
CPU OFF start
O,O,O,O x,x,x,x DDR initialization has failed
O,O,x,x x,x,x,x Save data check error
x,x,x,x O,x,x,O DDR initialization has com-
pleted
General Procedures & Information
GP 19
(Figure 1) and (Table 1) LED Legend.
Table 1 LED Legend
Related HW Failure Location/Details
ESS Not all are ON: Failure at power source? Failure at
ASSY?
ESS ON: ESS Error
ESS ON: ESS Error
ESS ON: ESS Error
ESS ON: ESS Error
ESS ON: ESS Error
ESS ON: ESS Error
RAM Blinking: RAM Error
RAM Blinking: RAM Error
RAM ON: RAM Error
BUS Updated 12/2011
7
4
3
0
Figure 1 ESS PWB On/Off LED's
Table 1 LED legend - O"ON, x: OFF.
Normal
Diagnostic
O
O
O
O
O
O
O
O
O
O
07/2011
6-54
Long Boot Related
Diagnostic Fault Code
O
O
O
O
O
O
O
O
O
O
WorkCentre 5335 Family Service Documentation
Initial Issue