Brother HL-4000CN, Service Manual

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V-52
*Electronic billing meter (count) function and backup
The monochrome and color meters have backup meters.
The printer compares the main and backup meters when the power is turned ON.
If there is a discrepancy between the main and backup meters, the hardware of both
meters is diagnosed by read/write tests.
1. If either or both meters are abnormal, a fatal error (C/E call) is assumed.
The C/E replaces ESS-PWB.
2. If both diagnostic results are correct, the main meter is believed.
The main meter is copied to the backup meter for matching.
Then the mismatching is counted as an abnormality recovered automatically as a
non-critical error.
ESS PWB
U8
U9
Fig.5-6
4.10 Test Print
Function: Printing an internal test pattern of the printer
Operation procedure:
1. Enter the Diag. (C/E) mode.
2. Select [CE Maintenance Test Print] with the and buttons.
3. Press the Form Feed/Set button to advance to diagnostic item selection in [CE
Maintenance Test Print].
4. Select a test print pattern with the and buttons.
(For the test print patterns, refer to the table below.)
5. Press the Form Feed/Set button to determine the test print pattern.
6. Press the Form Feed/Set button again to execute test printing.
(The LCD panel displays [Processing].)
7. After outputting the test print, the printer becomes Ready to Print state.
(The LCD panel displays [Ready].)
Test print patterns
Item Description
No Image [IOT] Feeds and outputs paper with no image.
Grid2 [ESS] Outputs an ESS internal grid pattern.
H Patt 600 [IOT] Outputs an IOT internal 600-dpi pattern.
H Patt 1200 [IOT] Blank paper (MCU: No Support)
Cyan 20% [ESS] Outputs an A4 solid pattern of 20% cyan.
Magenta20% [ESS] Outputs an A4 solid pattern of 20% magenta.
Yellow 20% [ESS] Outputs an A4 solid pattern of 20% yellow.
Black 20% [ESS] Outputs an A4 solid pattern of 20% black.
CMY 20% [ESS] Outputs an A4 solid pattern of 20% C.M.Y each.
Gradation [ESS] Outputs 100% to 2% gradation patterns to A4 sheets in four
colors.
NIP adjust [ESS] Outputs the NIP adjustment pattern to A4LEF.
PF REGI Adj Outputs the Paper feed registration correction chart to A4
sheets.