Main Pcb; Head Pcb; Carriage Pcb; Electrical Configuration - Brother MP-21C Service Manual

2.2

Electrical Configuration

(1)

Main PCB

• The Main PCB controls the following functions :
Data reception, Control panel control, Paper feed and carriage motor control,
Paper sensing, Cartridge detection, Head voltage control, Data transmission to
the head driver
• A one chip type CPU with a program of 128 KB is used.
• 2 buttons (the
(2)

Head PCB

• The Head PCB has the following components
4 LEDs, 1 cover sensor
The head drive IC is on the Head PCB and is connected via 4 FPC cables from the
head unit.
The Head PCB is connected to the Head FFC cable.
(3)

Carriage PCB

• The Carriage PCB has 1 linear encoder sensor.
• The Carriage PCB has a head temperature detect sensor.
(4) DC/DC unit
• The power supply unit has the following functions :
3.3V or 5V power supply for the logic, 12V for the motor, 13 - 30V for the print
head.
(5) Cartridge sensor PCB
• The Cartridge sensor PCB has 2 cartridge sensors.
• This PCB is connected to the Head PCB via a harness.
(On/Off) button and the Clean button) are on the Main PCB.
II-4
PR99052