17Intermec EasyCoder 501 – Service Manual Ed. 7
Chapter 2 Front and Keyboard
2.2 Display/Keyboard
The keyboard/display assy. is connected to P-603 at the upper right
corner of the CPU-board via a 20-p fl at cable. This cable must be
disconnected before the keyboard/display can be removed.
The keyboard/display must be manipulated carefully when it is
lifted out of its cavity. Do not use any force! If the assembly seems
to be stuck, open the right-hand door and remove the left-hand
cover to check that the grub screws do not interfere with the brack-
ets.
We also recommend you to open the right-hand door and remove
the left-hand cover before you start to fi t the keyboard/display assy.
back into the front moulding, since it makes it easier to align the
brackets with the grub screws.
The keyboard/display assy. consists of a plate with two brackets, a
self-adhesive keyboard, an interchangeable slide, and a keyboard
interface pcb. with a 2 × 16 character LCD and three LEDs. The
keyboard is connected to P-3 on the interface pcb. via a semi-trans-
parent cable running through a slot in the plate. The cable to the
CPU board is permanently affi xed to the interface pcb.
The contrast of the LCD display can be adjusted by means of the
potentiometer WR-1 on the CPU board. The potentiometer can
be accessed via a hole in the rear plate, next to the communica-
tion port "uart1:", see Chapter 4.2. The display should be adjusted
according to the prevailing light conditions when viewed from a
normal working position.
2.3 Display Contrast
Adjustment
Keyboard
Plate
Keyboard Interface pcb.
Slide
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