Thales DVOR 432, Technical Manual

Page: 140 / 234

DVOR 432
Maintenance Operation and Maintenance
5-4
Ed. 01.04
5.3 NORMAL MAINTENANCE
5.3.1 Replacing the Lithium Batteries (MSP-C, MSP-VD, LCP)
To back up data in the non volatile RAM in case of a voltage drop, the subassemblies MSG-C,
MSP-VD (MSP-D) and LCP contain Lithiumbatteries. Lithiumbatteries have an extended life time.
The battery voltage is checked by the BIT of the system. The individual batteries are soldered to the
pc boards. The battery back up function is enabled via jumpers, set during first setup or before replacĆ
ing the respective pc board. Always observe the label on the battery. The Lithiumbattery has to be
replaced by the same battery type. Other types of lithium battery are not approved by Thales ATM.
WARNING
Do not recharge, disassemble, heat above 100 °C or incinerate the lithium cell. Do not
short circuit, or solder directly on the cell. Disregard of the norms regarding the use of
lithiumbatteries may cause risk of fire, explosion or leaking out of toxid liquid and gas.
Run-down batteries are objects that can pollute the environment and must be disposed
of with proper precautions.
CAUTION
Contents of the RAM will be lost when the jumper is opened which enables battery voltage
to the RAM device.
- Replacing Lithiumbattery:
We recommend switching the transmitter whose Lithium batteries are to be replaced over to
standby operation and then switching it off. The other transmitter will remain switched onto the anĆ
tenna. This will ensure that any interference resulting unintentionally fromthe replacement proceĆ
dure will not affect the radiated signal. A soldering iron with a grounded soldering tip should be
used. A battery short-circuit via the soldering iron for the duration of soldering is unlikely to harm
the relatively high-impedance battery, but should however be avoided wherever possible. The
procedures is as follows:
- Back up the data of the respective transmitter being serviced.
- Draw out halfway concerned pc board.
- Remove jumper (X7 on MSG-C, X7 on MSP-VD (MSP-D), X36 on LCP).
- Re-tin the soldering tags of the new battery in order to ensure a good soldered connection
- Unsolder the minus and plus pole of the old battery, and remove the battery from the pc board.
- Insert the new battery, and solder the minus and plus pole of the battery.
NOTE: If the rack supply voltage needs to be disconnected during the period when the batteries
are unsoldered, the charge stored in the circuit capacitors will protect the RAM contents
for approx. 30 s. If the information is lost however, all transmitter parameters must be re-
entered when the batteries have been resoldered.