Intermec EasyCoder 501 XP & 601 XP – Service Manual
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Chapter 2 Front and Keyboard
The console pcb manages the keyboard, the display, two of the
three LED control lamps, and the beeper by means of a slave pro-
cessor. The communication to and from the CPU board goes via
an I2C bus on a 10-p fl at cable. This cable is permanently affi xed
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 × 16
character with a 5 × 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 audi-
ble signals. The key-acknowledge signal can be controlled by the
Fingerprint instruction KEY BEEP, whereas other signals are con-
trolled 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 Fingerprint instructions LED ON and LED OFF. The center
LED is green and the right-hand LED is red. The right-hand LED
(marked “Error”) is usually used to indicate that an error has
occurred.
2.3 Console pcb.
Error LED (red)
Ready LED (green)
Power On LED (green)
LCD Display
Keyboard Connection
Beeper
Slave Processor
Cable to CPU Board
