Service manual

5.1 OVERVIEW
Types of errors that may produce a similar symptom in a page printer, such as poor print quality or
abnormal operation, vary widely, making identification of failed parts and components more
difficult. To overcome such problems for this printer, this section describes troubleshooting
procedures using the printer’s built-in self-diagnostic function for easy and efficient repair.
5.2 SELF-DIAGNOSTIC FUNCTION
This printer’s control circuit is equipped with a self-diagnostic function that checks the operating
conditions for each component. If the printer detects an error that a user cannot recover from, the
printer displays the location and error code on the LCD panel. The message is as follows:
Service Req
effff
In the message above, e represents the error type and ffff represents the error code. Errors are
divided into two categories: E and C.
❏ E: Related to the engine.
❏ C: Related to the controller.
Table 5-1 lists error types and error codes.
Table 5-1. Service Call Error
Error Type Error Code Description
E
0003
0004
0005
0006
0009
0014
Fusing unit error
Main motor error
Fan motor error
Polygon motor or laser scanner error
Laser diode error
Engine communication error
C
0001
0002
0003
0004
0007
0009
0010
0017 to 0031
0036
0128 to 0254
0255
1000
1001
1002
1003
1100
1101
1120
1121
1122
1123
1170
1180
CPU error (Reserved)
CPU error (Privilege violation)
CPU error (Illegal instruction)
CPU error (Unsupported FPU instruction)
CPU error (Address misalignment)
CPU error (Reserved)
CPU error (Tag overflow)
CPU error (Unsupported interrupt)
CPU error (Unsupported coprocessor instruction)
CPU error (Unimplemented instruction)
CPU error (Break error)
Standard RAM error (RAM not recognized)
Standard RAM error (Minimum stack unrecognized)
Standard RAM error (Memory address less than 4MB )
Optional RAM error (Memory address 4MB or more)
ROM checksum error (bit 0 to 15, font)
ROM checksum error (bit 16 to 31, font)
ROM checksum error (bit 0 to 7, program)
ROM checksum error (bit 8 to 15, program)
ROM checksum error (bit 16 to 23, program)
ROM checksum error (bit 24 to 31, program)
NLSP Font ROM checksum error
Optional ROM SIMM checksum error
EPL-N2000 Service Manual Troubleshooting
Rev. A 5-1