Barco SLM R12 Plus, Service Manual, Page: 46 / 281

8. Local Keypad & LCD Display
C
A
B
1
2
3
Image 8-3
Board removal
2. Remove the 3 screws (C) holding the board onto the front end.
3. Replace the LCD display module.
Removal Control Switch module
1. Disconnect the flat cable plug (1) and wired plug (2) from control switch module (image 8-3).
2. Release the flat cable locks on both sides of the flat cable connector (3) and remove the key pad flat cable out of connector.
3. Remove the 2 screws (A) holding control switch board onto key pad metal support.
4. Replace the control switch module.
Removal Key pad foil
1. First, remove the control switch module (See preceding procedure).
2. Remove the 4 screws (B) holding key pad metal support onto front end (image 8-3).
3. Replace the key pad foil.
8.3 Technical Description
Introduction
The local control panel is built around a PIC16C55, an EPROM-Based 8-Bit CMOS Microcontroller with hardware selectable en-
hancements. The difference between I1 and I3 is that the first is a classic through component and the second is a SMD PIC processor
version.
The local keypad is the integrated control device of the projector.
Depending on the key that is pressed, an RC5 code is generated. This code is sent to the CPU-board, which converts the code to
projector commands.
A character based LCD display (24 characters by 2 lines) can be connected to the unit. This LCD is used for displaying menu’s and
error messages. The CPU-board can control the display through an I²C I/O expander.
44 R5976820 SLM R12+ PERFORMER 08/03/2005