Job scheduler diagnostics

• US 4,947,397 A
• Filed: 11/02/1988
• Issued: 08/07/1990
• Est. Priority Date: 11/02/1988
• Status: Expired due to Term

• Current Assignee: Xerox Corporation (Xerox Holdings Corp.)
• Original Assignee: Xerox Corporation (Xerox Holdings Corp.)
• Inventors: Sundquist, Douglas F., Filion, Joseph L., Sobel, Elliot J.
• Primary Examiner(s): Atkinson, Charles E.
• Application Number:
  US07/264,772
• Time in Patent Office: 643 Days
• Field of Search: 371/16.4, 371/16.5, 371/29.1, 355/203, 355/204, 355/205, 355/206, 355/207, 355/209, 364/200, 364/900
• US Class Current: 714/45
• CPC Class Codes: G06F 11/0733 in a data processing system embedded in an image processing device, e.g. printer, facsimile, scanner
• CPC Class Codes: G06F 11/0778 Dumping, i.e. gathering error/state information after a fault for later diagnosis
• CPC Class Codes: G06F 11/14 Error detection or correction of the data by redundancy in operation G06F11/16 takes precedence

Abstract

A reproduction machine having image processing means for forming a image, a controller for directing the operation of the image processing means to complete a job reproduction run, the controller including a random access memory for storing machine status information during a machine cycle down interruption prior to the completion of the job reproduction run, a disk memory, and means for detecting controller faults, the method of saving the status information in the random acess memory including the steps of routinely loading machine status information into the random access memory at a machine cycle down, detecting a pre-determined controller fault causing a machine cycle down, and upon detecting said pre-determined controller fault, automatically transferring the machine status information from the random access memory onto the disk memory.

Claims

1. In an image processing apparatus having image processing means for forming an image, a controller for directing the operation of the image processing means, the controller including a random access memory, a second memory, and means for detecting controller faults, a portion of the random access memory allocated to store controller status information, said portion of the random access memory including previous apparatus cycle down state information and current job imaging process completion information, the method of saving information for diagnosing the controller comprising the steps of:

periodically loading controller status information into said portion of the first memory,

detecting a pre-determined controller fault, and

automatically transferring the control status information from said portion of the random access memory into the second memory in response to the detection of said predetermined controller fault.

2. The method of claim 1 wherein the second memory is a rigid disk memory.

3. The method of claim 2 including the step of transferring the information on the rigid disk onto a floppy disk.

4. The method of claim 1 including the step of printing the information on the rigid disk onto hard copy.

5. In a reproduction machine having image processing means for forming an image, a controller for directing the operation of the image processing means to complete a job reproduction run, the controller including a random access memory for storing machine status information during a machine cycle down interruption prior to the completion of the job reproduction run, a disk memory, and means for detecting controller faults, the random access memory including a first segment storing the status information of the current machine cycle down and a second segment storing the status information of a previous machine cycle down, the method of saving the status information in the random access memory comprising the steps of:

routinely loading machine status information into the random access memory at a machine cycle down,

detecting a pre-determined controller fault causing a machine cycle down, and

upon detecting said pre-determined controller fault, automatically transferring the machine status information from the random access memory onto the disk memory.

6. The method of claim 5 wherein the random access memory includes a third segment storing the current status of the in process job reproduction run.

7. In a reproduction machine having image processing means for forming an image, a controller for directing the operation of the image processing means to complete a job reproduction run, the controller including a disk memory, means for detecting controller faults, and a random access memory for storing machine status information during a machine cycle down interruption prior to the completion of the job reproduction run, the random access memory including a first segment storing the status information of the current machine cycle down, a second segment storing the status information of a previous machine cycle down, and a third segment storing the current status of the in-process job reproduction run, the method of saving the status information in the random access memory comprising the steps of:

loading machine status information into the first segment of the random access memory at a first machine cycle down,

loading current status information of the in-process job reproduction run into the third segment of the random access memory,

transferring the machine status information from the first segment of the random access memory to the second segment of the random access memory at a second machine cycle down,

loading machine status information into the first segment of the random access memory at the second machine cycle down,

replacing the current status information of the in-process job reproduction run into the third segment of the random access memory,

detecting a pre-determined controller fault causing a machine cycle down, and,

upon detecting said pre-determined controller fault, automatically transferring the machine status information corresponding to both the first and the second machine cycle down from the random access memory onto the disk memory.

8. The method of claim 7 including the step of printing the transferred machine status information on the disk memory onto hard copy.

9. The method of claim 7 including the step of transferring the transferred machine status information on the disk memory to a personal computer or to a communications network.