How to solve error 6A90 or "APP sensor error" on Canon printers

Error code 6A90 or "APP sensor error" occured during paper feeding or purging.

Solution 1:

• check for foreign material or paper debris around the purge drive system unit;
  - remove foreign material.

Solution 2:

• check for foreign material or paper debris around the ASF unit;
  - remove foreign material.

Solution 3:

• If other solution fail, replace one off the following part

- Purge drive system unit
- Logic board

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necessary ports and programs are not being blocked by security or firewall programs

In some cases, third-party security or firewall software may be blocking or restricting port traffic or programs causing unexpected results such as inability to install or loss of functionality. Check with the software manufacturer for information on unblocking ports or adding exceptions for specific programs.
The following are ports and programs necessary for your printer to function properly.
Ports
TCP 80
TCP / UDP 8611
TCP / UDP 8612
TCP / UDP 8613
UDP 3702 - (Windows 7 / Windows Vista)

The following port list applies only to models with memory card slots

TCP / UDP 137
TCP / UDP 138
TCP / UDP 139
Programs
IJ Network Tool
Default location

c:Program Files (x86)CanonCanon IJ Network ToolCNMNPUT.EXE (Windows)
/library/printers/canon/bjprinter/utilities/canon ij network tool.app (Macintosh OS X)

IJ Network Scan Utility

Default location
c:Program Files (x86)CanonCanon IJ Network Scan UtilitylCNMNSUT.EXE (Windows)
/library/printers/canon/bjprinter/utilities/canon ij network scan utility.app (Macintosh OS X)

IJ Network Scanner Selector

Default location
/library/printers/canon/ijscanner/utilities/canon ij network scanner selector2.app (Macintosh OS X)

MP Navigator EX

Default location

C:Program FilesCanonMP Navigator EX** mpnex**.exe (** refers to version number) - (Windows)

/application/canon utilities/mp navigator.app (Macintosh OS X)

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Print Spooler Error 1068 in Canon Printer The dependency service or group failed to start.

When trying to start the Print Spooler Service, Error 1068 means "The dependency service does not exist. or the dependency service or group failed to start."  

Depending on your environment and your type of printer installed, your Print Spooler Service will have other dependent services that must be running before the Print Spooler Service will start.  If the dependent services are not running, you will see an error 1068 or similar message about dependent services when trying to start the Print Spooler Service.

Some canon printers will add their own services to XP and the starting of the Print Spooler Service lists them as dependencies and therefore those canon Services must be running before the Print Spooler service will start.  It may be listed as the LexBce Server.

Do you now or have you ever had have any canon printers installed?  If yes, are you still using the canon printers?

Depending on your printing environment, if you are using another kind of printer, you may have other Service listed in the Dependencies tab of the Print Spooler Service.

Use the XP Services Applet to check the Print Spooler dependencies and options.

Click Start, Run and in the box enter:

services.msc

Click OK to open the Service Applet.

Locate the Print Spooler Service, right click it, choose Properties and then look at the Dependencies tab.  The services listed there must be running before the Print Spooler Service will start.  If they are not running, you will get an error 1068 or similar message about dependent services when trying to start the Print Spooler Service.

You should always see the Remote Procedure Call (RPC) service and maybe some others depending on the type of printer you have installed (canon printers can add some Dependency Services to your XP configuration).  All dependent services must be running before the Print Spooler Service will start. 

The dependent Services may vary depending on the type of printers you have installed.

The RPC service is also necessary for a lot of other things to work properly and is usually always running and set to Automatic start. 

If the RPC Service is not running and does not start Automatically, you may have some other problems, but start with the easy stuff first.

From the Services Applet, locate the Remote Procedure Call (RPC) service and if it is not running, right click it and start it and set it to Automatic.

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