UBI EasyCoder 601 XP – Service Manual Ed. 1
16
Chapter 2 Front and Keyboard
Console pcb
The console pcb manages the keyboard, the display, two of the three
LED control lamps, and the beeper by means of a slave processor.
The communication to and from the CPU board goes via an I2C bus
on a 10-p flat cable. This cable is permanently affixed to the console
pcb and connected to P37 a the front end of the CPU board.
The display is a LCD display with background light. It has 2 x 16
character with a 5 x 7 dots matrix. 8 characters are programmable.
There is no display contrast adjustment.
The beeper has a frequency between 104 and 9.999 Hz. It is used
to acknowledge when a key is pressed and to produce various
audible signals. The key-acknowledge signal can be controlled by
the UBI Fingerprint instruction KEY BEEP, whereas other signals
are controlled using the instructions BEEP and SOUND.
The left-hand LED control lamp (marked “Power”) shines green
when the power is on. Power on is also indicated by the display's
background light. The other two LEDs are programmable using the
UBI Fingerprint instructions LED ON and LED OFF. The centre
LED is green and the right-hand is red. The right-hand LED
(marked “Error”) is usually used to indicate that an error has
occurred.
Power On LED
(green)
Error LED
(red)
Ready LED
(green)
LCD Display
Beeper
Slave Processor
Keyboard Connection
Cable to CPU Board
2.2 Keyboard/Display,
cont'd.
