Brother MFC-3340CN Service Manual page 217

8.5.3 Test Pattern (Function code 09)
Function code 09 is not supported in the maintenance program embedded in the flash ROM of the
MFC3240C/FAX1840C U.S.A./Canadian models. To use Function code 09 in these models, you
need to temporarily load the full maintenance program onto the flash ROM. Refer to
n Function
This function, much like the copying function, prints out a test pattern (PRINT QUALITY CHECK
SHEET) to allow the service personnel to check for print quality.
n Operating Procedure
Press the 0 and 9 keys in this order in the initial stage of the maintenance mode.
The figure on the next page shows a test pattern which is printed on the PRINT QUALITY CHECK
SHEET. According to the instructions printed on the sheet, you can check or correct the print quality.
8-10
Section 8.1.
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