LX2
plus / advanced and LX4 plus / advanced
B2270901
Content is subject to change without notice!
8
PCB No. 227.01.xx / PCB No. 230.01.xx2:
IS4 is a non-volatile memory holding all necessary parameters for a correct operation of
the pager. Additionally, all received messages are stored by IS4.
3.2.5
Display
The display shows the incoming messages and the operator menues. The display is par-
allel driven. The voltage divider sets the voltage reference of display LCD1. Components
C1, C3, C5, C6, C11, C12, C13, C15, C19, R1 and R2 are necessary in order to generate
the LCD voltage of appr. 7.2V. The LCD can be back-lighted by lamps H2 and H3.
3.2.6
Controller
PCB No. 227.02.xx:
Microcontroller IS2 controls all functions like decoding radio data , alerting, displaying
messages , back-lighting, ...
If self-reception occurs, the controller can be operated with a different crystal frequency of
Q2. The following frequencies can be used and recognized by the controller firmware,
automatically:
firmware F2270112 and previous firmware F2270113 and later
3.579545 MHz 3.532800 MHz
3.686400 MHz 3.579545 MHz
4.000000 MHz 3.686400 MHz
4.032000 MHz 3.840000 MHz
4.096000 MHz 3.993600 MHz
4.000000 MHz
PCB No. 227.01.xx / PCB No. 230.01.xx:
There are two microcontrollers IS2 and IS6. Controller IS6 decodes radio data and an-
nounces reception towards IS2 via serial interface. Controller IS2 controls all functions:
operating, signalling, displaying messages.
If self-reception occurs, the controller can be operated with a different crystal frequency of
Q2 = Q3. The following frequencies can be used and recognized by the controller firm-
ware, automatically:
3.532800 MHz
3.579545 MHz
3.686400 MHz
3.840000 MHz
3.993600 MHz
4.000000 MHz
