Riso ComColor X1 series Technical Manual page 370

2-5-5. Decouple PCB
Converts signals from the controller PCB unit to data for the Panel Control PCB.
No. of
Name
Pins
CN1 5 Power supply unit CN5 (12V voltage supply)
CN2 4 Controller PCB J2
CN3 16 Panel control PCB CN5
CN4 14 Controller PCB J1/4/17
CN7 19 Panel control PCB CN6
CN8 20 Controller PCB J3
2-5-6. Panel Control PCB
General panel control is performed by this PCB, incorporated in the operation panel unit. The single-chip
microcontroller (78KO/KE2) mounted on the PCB controls hardware buttons, LEDs, the touch panel, buzzers,
and other components. A voltage buzzer is also mounted on the PCB. Communication with the controller PCB
unit is conducted via a serial connection (RS-232C).
The panel control PCB starts up immediately after receiving +5VSB from the power supply unit. Control by this
PCB ensures that the engine control PCB and optional components receive the required voltage.
2-5-7. Mode Button PCB, Numeric Keypad PCB, and LED backlight
The mode button PCB is a board with wired input devices. It manages input from mode, counter, and shortcut
buttons 1-3.
The numeric keypad PCB controls key input from the interrupt, power, and wake-up buttons, among others. It
also controls display for the main power, regular power, wake-up, start, error, data reception, and interrupt LEDs,
among others.
LED backlight, controlled by the panel control PCB, illuminates backlighting required for display by the LCD.
CN7
1
(LDVS)
To Panel control
PCB CN6
DECOUPLE-PCB
To Controller PCB J3
1 19
CN8
2 20
To Panel control
PCB CN5
CN3
16 1
To Controller PCB J1,4,17
CN4
1 14
Connected To
[ 14-19 ]
Electronic Components
19
DIAG
page
45
45
45
45
45
45
Rev.1.00