LG Electronics LKD-8DS, GDK-20W PCB Installation, PCB Handling & General Installation

GDK-20W DIGITAL WIRELESS KEY TELEPHONE SYSTEM

3.4 PCB INSTALLATION

PCB Handling & General Installation

All boards should not be installed or removed while power applied.

Power must be turned off prior to insertion or removal of the PCB.

The system PCBs contain digital circuitry which can be damaged by exposure to excessive static electricity. When handling PCBs, a grounded wrist strap should be used to protect the boards from static discharges. Also, use common sense when handling the PCBs. For example, do not place a PCB in locations where heavy objects might fall on the PCB and damage components.

To insert a PCB, hold the PCB and, with component side facing right, insert the card into the MBU’s din connector firmly and tighten. To remove a PCB, reverse the procedure. Installation method of PCB is shown in Figure 3.4.1.

Figure 3.4.1 PCB Installation

There are 6 slots in the GDK-20W system for extend or modify the system configuration. But, there are some restrictions when optional board installation. Note that the system can not operate properly with wrong installation. The SLOT1 of the MBU is reserved only for DVIB/DVIBE, the SLOT2 & SLOT3 is reserved for LCOBs or STIB2/STIB, the SLOT4 are reserved only for PMU and the SLOT5 and SLOT6 is reserved for WTIB and MFB, respectively.

To summarize, see the following table 3.4.1.

Slot No.	Cards	Remark
SLOT1	DVIB, DVIBE	Fixed slot for DVIB
SLOT2	LCOB2, LCOB, LCOBE,	Option board for LCO, ISDN
SLOT3	LCOBA, LCOB4,STIB2, STIB
SLOT4	PMU	Fixed slot for PMU(Basic)
SLOT5	WTIB	Fixed slot for WTIB
SLOT6	MFB	Fixed slot for MFB

[Table 3.4.1] Option Boards Installation Table

When the system power on, the default slot assignment is automatically redefined according to board installation status.

Main Board Unit (MBU) Installation

The MBU is installed in the KSU default. It comprised of main processor, four(4) Digital Terminal interface circuits, two(2)

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