Control Panel (Led And Buttons; Control Panel - Brother MP-21C Service Manual

4.9.6 Printer Status
The table below shows the details of the various printer status conditions.
Status
Not energized
Power off
Online
Operator call
Cleaning
Service call
The printer is energized up when you:
Insert the Printer Interface card in the PCMCIA slot with the PC powered on.
Turn on the PC with the Printer Interface card inserted in the PCMCIA slot.
Plug in the AC adapter jack to the printer.
All the four LEDs flash once and they turned OFF, however the power is supplied to the
printer.
Any status indication that occurs when the printer is powered up with the power button
pressed is a hidden status.
The printer operates in the following 3 modes.
Mode
Normal mode
Hidden
function mode
4.9.7

Control Panel

The control panel monitors the switches and sensors, as well as indicating the status on
the LEDs.
Switch status is detected after noise cancellation and switch debouncing. Data read for
two successive times detects the switch status (noise cancellation), then the current
status is defined after a further confirmation of three more switch reads.
LEDs turn off, light, or blink to indicate the printer status. Blinking includes 3 patterns:
4 LEDs blink at the same time,
Description
Power is not supplied.
Power is turned off (low power consumption mode).
Ready to receive data.
An operator call has occurred. It can be recovered by users
The print head is cleaning.
A service call has occurred.
Description
After initialization and error detection are carried out,
the printer goes into normal print mode.
Inspection Initialization is not carried out on the mechanical
mode parts; mechanical operation is controlled using
commands and switches. * For factory use only *
PCB check Mechanical operation is not performed; hardware
mode operation is checked. * For factory use only *
4 LEDs blink alternately,
I-12
3 LEDs blink successively.