Canon PS-7000, Service Manual

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Chapter 3 Troubleshooting
3-11
3.3. Checking results
The DIAG program automatically examines each components of the PS-7000, in the sequence listed
below. Progress of the DIAG program is indicated by the Status LED. If an error occurs, the related
LED turns red from green, and the DIAG program stops. All the Status LED flash in green at the end
of each loop, to indicate there is no problem detected.
Status LED
No. Check Item
Power
LED
Receiving Processing Printing
1
-ROM Check
Examines checksum.
Green Off Off
2
-Font Check(for JP model only)
Examines checksum of the Font ROM.
If there is no Font ROM installed, this test is skipped.
Off Green Off
3
-RAM Check
Performs random Write / Read check over the entire
RAM area.
Green Green Off
4
-EEPROM Check
Performs Write / Read check to a certain area.
Off Off Green
5
-NET Check
Lets the Network Board perform the ROM checksum
test of its own, and confirms that no error is returned.
Green Off Green
6
-HDD Check
Issues a command to the I/F and checks if the HDD
responds correctly.
Off Green Green
7
-Centronics I/F Check
Performs loopback test.
Green Green Green
8
-Normal End
Orange
Green flashing
Example of error indication by LED
Status LED
No. Check Item
Power
LED
Receiving Processing Printing
1
Error in ROM Check
Red Off Off
2
Error in Font Check
Off Red Off
3
Error in RAM Check
Orange
Red Red Off
3.4.Terminating the DIAG program
1) Power off the machine, and remove the Power Cord. The power can be turned off at any time
during the DIAG program.
2) Return the DIP switch 6-pin to ON in the 1-loop mode, or 6-pin and 8-pin to ON in the infinite
mode.
3) Slide the Right Side Cover to close and attach the Top Cover. Connect the Power Cord, and return
the other cables to connection before the DIAG program.