Brother International HL-3400CN Service Manual - Page 136

CHAPTER 5 CONTROL PANEL OPERATION 3. ENGINE CONTROLLER MODE This section describes the operation and setting procedures for each engine test in the Engine Controller Mode. In order to go into the Engine Controller Mode, turn on the printer while holding down the Mode, Set and V buttons. 3.1 Configuration of Operational Mode This printer has the various functions as set out in Table 5-2 for the user to easily understand the operation status of the printer engine during maintenance work. (1) Normal Mode: After removing the main PCB from the printer and pressing the On Line button under the Engine Controller Mode, the printer goes into the Engine Normal Mode. This mode provides functions to indicate the operation status of the printer and also messages relating to normal operations which the operator is controlling. NOTE: Be sure to remove the main controller PCB before the printer goes into the Engine Normal Mode. If you fail to do so, the printer goes into sleep mode. (2) Service Mode: After turning on the printer in the off-line status, the printer goes into Service Mode. This mode is a unique mode for the serviceman only and provides additional functions (codes 31 through 37) to confirm the operational status during maintenance work and `3 9 FACTORY MODE' to confirm and set the operational status of the main components. 5-14