GE marquette MAC 1100, Servicing Instructions

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Marquette Hellige GmbH MAC 1100/1200 V 1.1 Page
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227 492 20 D - 0002
BATT/
Pin
Number Signal input/output Function Definition
1 +24V Output Supply battery charging
2 +24V Output Supply battery charging
3 +24V Output Supply battery charging
4 Code Coding Pin
5 NC
6 GND24V common Ground
7 GND24V from power supply
8 GND24V after ferrite decoupling
9 GND24V
10 +UBATT Input Battery voltage
11 +UBATT Input Battery voltage
12 +UBATT Input Battery voltage
13 +UBATT Input Battery voltage
14 +UBATT_ME Input
Battery measuring output
15 Code Coding Pin
16 +5V_L Output + 5V supply
17 NC
18 BATT_OPT_ Input Status option battery
“0“: option active
19 LOAD_OFF Output Charging reduction
“1“: reduced charging
20 NC
2.5.2.3 Interface to the LCD Graphics Display
The interface to the LCD graphics display provides the LCD data signals, the display
supply vo5V and VEE, the display contrast voltage V0 and the display on/off
control signal.
Connector denotation: HOS/
Type: Foil connector, 14- pin, zero power insertion, 180°
The LCD supply voltage VEE can be measured at R 731 on the PCB Control CS_CI,
the LCD contrast voltage can be measured at R 730. Both levels of these voltages
depend on the contrast selected.
The voltage supply for the CCFL tube of the display is provided separately via the
connector
BL/.
Caution! Do not touch! High AC voltage!
2.5.2.4 Interface to the keypad
The interface to the keypad is realized with the connector KEYB/. It contains the
signals for the keypad rows and columns, the supply and the control signals for the
status LEDs of the keypad. The foil connecting cable is part of the keypad itself.