Xerox Nuvera 100, Service Manual

Page: 81 / 304

Error Codes and Messages 2-3
Rear Panel LEDs Error Codes
The rear panel LEDs are located on each side of the rear panel DIP
switches.
NOTE: All references to right and left are as viewed from the reat of
the printer.
The left LED represents the operation of the PostScript firmware.
The right LED represents operation of the main board’s print engine
firmware. During the Power On Self Tests (POST), the two LEDs
toggle back and forth for each successful pass through each SDRAM
test. A failure in the power on self tests is indicated by the left LED
(the PS LED) flashing in a specific pattern of long and/or short
flashes and repeated indefinitely. A long flash represents a 5, while a
short flash is a 1. For example, a long flash followed by 4 short
flashes is 5 + 4 = 9. If the left LED repeatedly flashes in the same
sequence, then the PostScript processor has encountered an error and
is looping. The possible LED-encoded error codes are listed in Table
2-1. Other failures are indicated by the failure being printed on the
Startup Page.
Table 2-1. Main Board Power-up Self-test Error Codes
Left LED
F l a s h e s
Long flash=5
Short flash=1
2L+ 1S=11 Meaning D e t a i l s
1 not used
2 SDRAM SIMM Presence This test verifies for the presence of both
SDRAM SIMMs. If both SDRAM SIMMs are
missing, the resultant error indication is 2 short
flashes from the left LED.
3 SDRAM Bank 0 This test verifies DRAM Bank 0 in the DRAM
DIMM located in position 0 (closest to the rear
panel.)
4 SDRAM Bank 1 This test verifies DRAM Bank 1 in the DRAM
DIMM located in position 0 (closest to the rear
panel.)
5 SDRAM Bank 2 This test verifies DRAM Bank 0 in the DRAM
DIMM located in position 1 (farthest from the rear
panel.)
6 SDRAM Bank 3 This test verifies DRAM Bank 1 in the DRAM
DIMM located in Position 1 (farthest from the rear
panel.)
7 not used
8 not used