Self Test - Canon LBP-3260 Service Manual

CHAPTER 2
C. Self Test
The printer executes the self diagnostic program of the video controller to check the condition of
the video controller at the power-ON. This function is called self test.
There are two types of self tests: power-ON self test and power-ON key sequence.
1. Power-ON self test
Every time the printer is turned ON, the power-ON self test is conducted following the procedure
stated below.
1) Tests all the DRAMs on the video controller. Error found here will be displayed in the LCD
as a service call.
2) Tests the program ROM, font ROM and optional ROM. Error found here will be displayed in
the LCD as a service call.
3) Checks inside of the CPU. Error found here will be displayed in the LCD as a service call.
4) Completes the test. If an error is reported from the engine controller at this point, it will be
displayed in the LCD.
5) Displays "READY" in the LCD and prints the PCL demo-page automatically.
2. Power-ON key sequence
Pressing specified keys simultaneously at the power-ON executes the specific functions. Among
the following operations, only the Cold Reset sequence is for the user.
a. Cold Reset
Turn ON the printer with the On Line key pressed.
The Cold Reset resets all the printer settings to the factory default values.
b. Check Sum Functions
Turn ON the printer with the On Line and Enter keys pressed (PPG Check Sum). Or, turn ON
the printer with the On Lien and Reset keys pressed (PS Check Sum).
The printer performs the check sum on the requested ROM bank. The calculated check sum
will be displayed in the LCD.
c. Factory Reset Function (A4/LTR)
To reset the paper size default to A4, turn ON the printer with the Menu, Item and Shift keys
pressed.
To reset the paper size default to Letter, turn ON the printer with the Menu, Item, and
Plus/Minus keys pressed.
The printer uses the selected paper size (A4/Letter) as the default value, resets the page count
to "0", and executes the Cold Reset. The Cold Reset executed hereafter will maintain the paper
size selected here.
d. Panel Check Function
The Panel Check Function performs the control panel diagnosis and test sequence.
sequences in the Panel Check Function are as follows.
1) Turn ON the printer with the On Line and Shift keys pressed. "PANEL CHECK" message will
appear in the LCD.
2) Step 3 to 11 can be executed as many times as you wish in any order.
3) Pressing the On Line key illuminates the top left half of the LCD (10 columns). Releasing the
key will clear the display.
4) Pressing the Continue key illuminates the top right half (10 columns) of the LCD. Releasing
the key will clear the display.
5) Pressing the Form Feed key illuminates the top line of the LCD (20 columns). Releasing the
key will clear the display.
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