2.5 BOARD INSTALLATION INSTRUCTIONS
2.5.1
General
Before inserting boards into the ME rack, the following preliminary work is required.
*WARNINGS*
A.
This equipment contains a considerable number of MOS, and other static sensitive components. To
reduce the incidence of the premature failure due to static discharge, the following precautions
MUST be taken:
Always ensure that power is disconnected before plugging
Always discharge static from yourself by touching a conductive part of the main equipment
before handling boards.
Handle
by the edge or by the handles. Do not handle PBA tracks, components or edge
connectors (contaminants introduced by fingers can cause corrosion and high resistance
connections).
Components are physically delicate. Finger pressure on a component can fracture, but not
necessarily break component leads: a future fault.
To protect against physical damage and damage due to static discharge,
must ALWAYS be
inserted into a conductive ANTI-STATIC bag and placed in the protective container provided with the
new item.
In the case of the CPB-AN remove the battery and package separately.
These procedures apply equally to both working and faulty
Careless handling, storage and
transporting will cause secondary or future faults.
B.
To
prevent the likelihood of damage to electronic components, power should be switched off before
working on the systems.
C.
The cabling between the Main Equipment and Stations is polarity sensitive. It is essential that the
correct polarity be maintained from the Main Equipment to the Stations and pairs must not be
swapped. Care must be exercised when checking voltages on cabling.
WIRE
COLOUR
605 PLUG/
WIRE
610 SOCKET
DESIGNATION
WT White
2
AL’
BL Blue
6
AL2
RD Red
1
BD+
BK Black
5
D.
Power supplies are powered from the 240 volt mains supply and hazardous voltages are present
within. Do not attempt to repair these devices in the field.
E.
CPB-AN BOARDS
If this PBA is replaced, all site dependant data and abbreviated dial numbers are lost. It will be
necessary to re-programme the system.
The battery may be changed by removal of the daughter board (without loss of any
programmed data) with the CPB-AN power up, i.e. power on.
F.
TMB-AN BOARD
If this board or the CPB-AN board are replaced, then the system clock is lost and must be
reprogrammed.
2.5.2
CPB-AN
The CPB-AN board requires a lithium battery to maintain the data stored in RAM memory. The battery
board BTB-A fits on the CPB-AN board as shown in fig. 2.5.2.
The fuse
is a 250mA fuse which protects the battery from possible damage due to an accidental short
circuit. Be sure that the fuse is not blown and then install the attached battery. Ensure that the battery is
connected with the correct polarity. A LED is provided on the board to light if the battery voltage is low. As
well as the LED, all Handsfree Stations connected to the system will indicate the low battery voltage by
flashing ALMS in the display.
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