Brother LX-200, Service Manual

Page: 110 / 177

5-2
5.1.2 Outline of the Electronic Parts
Each PCB and the AC adaptor are described below.
•
Main PCB
The main PCB is located below the paper guide. It is connected to all PCBs,
motors, switches, and cables.
It converts the unstabilized DC voltages input from the Jack PCB to stab5V
and +24V DC voltages, which are supplied to all controllers.
The Main PCB controls motors, LED indicators, and buzzers according to the
signals input from the detector circuits on the Switch PCB, Paper size detector PCB,
Film detector PCB, and on the Main PCB itself.
•
Switch PCB
The Switch PCB is located at the rear of the body cover. It is connected by a cable
to the Main PCB.
On the Switch PCB are mounted the Power switch, Cut button, Feed button, and
Start button; the LED which lights the Start button; and connectors to connect to the
cover and dial leaf switches.
•
Jack PCB
The Jack PCB is located at the jack input at the rear of the bottom cover. It supplies
unstabilized DC voltages from the AC adaptor to the Main PCB.
•
Paper size sensor PCB
The Paper size sensor PCB is located on the Y-carriage. The sensors to detect the
document width are mounted on this PCB.
•
Film sensor PCB
The Film sensor PCB is located on the side of the film cartridge holder. The sensors
to detect the film type are mounted on this PCB.
•
AC adaptor
The AC adaptor converts the input AC voltage to an unstabilized DC voltage. The
AC adaptor jack is connected to the Jack PCB connector.