Brother HL-2440 Service Manual page 153

• Check that the Toner LED goes out.
Verify that the Ready LED is lit when pressing the [Go] button while the front cover is
closed. (When you press the [Go] button while the front cover is closed, the Toner
LED goes out.)
It remains off while the [Go] button is being pressed.
• Check the fan operation.
Close the front cover and verify the fan operation. (Verify full- speed and half-speed
rotations, and halt.)
The fan must repeat the following operations whenever the cover sensor is pressed.
Full-speed rotation - Half-speed rotation - Halt - Full-speed rotation.
• Check the Solenoid.
Verify that the T1 solenoid is turned on when the new toner sensor is turned on.
Verify that the registration solenoid is turned on when the registration front sensor is
turned on.
• Check the scanner motor and the main motor.
Open the back cover from a closed state as pressing the SW supporter while the front
cover is open, and then close again. Release the SW supporter and close the front
cover. The scanner motor starts rotating, and in two seconds the main motor starts
rotating. When you open the front cover, the scanner motor and the main motor stop
rotating.
• When the verification is completed, turn the power off.
10) Continuous Grid Pattern Print Mode
This mode is to continuously print a grid pattern with a serial number on it. The number
of grid pattern prints is displayed at the same time. The machine does not go back to the
ready state unless the power is turned off and on.
11) Fixing Unit Test Print
This is to print the following three patterns to check the fixing unit.
• Grid pattern with a serial number on it
• Gray pattern
• Black pattern
When this operation is completed, the machine automatically goes back to the waiting
Service mode state.
12) NV-RAM Value Dump Mode
This is to collectively print the present state of the NV-RAM of all machines. When this
operation is completed, the machine automatically goes back to the waiting Service
mode state.
13) RAM Check
This is to execute a stricter RAM check than a standard one. If the result turns out
unaccepted, it considers an error, and all the LEDs blink. If it turns out accepted, the
Ready LED and Error LED keeps blinking in alternate shifts. The machine does not go
back to the ready state unless the power is turned off and on.
14) QA Test print
This is to print four patterns to check the machine quality. When this operation is
completed, the machine automatically goes back to the waiting Service mode state.
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