ANATEL A643, Operator'S Manual, Page: 167 / 222

Anatel A643a - Anatel A643a Maintenance 167 of 220
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Anatel
Operator Manual
Removing the existing battery will erase the Anatel A643a’s parameter settings. Print them
(see
“Printouts” on page 117 ) if they differ from the factory settings so they can be restored after
the battery is replaced. It also will be necessary to recalibrate the instrument following this
procedure (see
“Calibration and Validation” on page 81 ).
CAUTION:
The A643a TOC Analyzer contains sensitive electronic components: take proper precautions
to avoid potential damage due to electrostatic discharge (ESD).
To check or replace the instrument’s lithium battery:
1) Remove the Analyzer’s Electronics Cover as outlined in “Preparatory Maintenance
Procedures” on page 157 .
2) Remove the Power Supply Assembly from the enclosure, being careful not to
disconnect its DC power cable from the circuit board backplane.
3) Remove the 26-pin ribbon cable from the upper processor board and move it out of the
way. On Access 643P portable instruments, also disconnect the 6-conductor flexible
cable to the display module from the processor board.
4) Release the 26-pin ribbon cable from its connector on the lower I/O board.
5) Firmly grasp underneath the 26-pin connector block and gently pull on it to slide both
boards out of the enclosure. They do not have to be removed from the enclosure
entirely.
Fig 13-16 : 26-Pin Connectors
Fig 13-17 : Lithium Battery