ISCO 6700SR, Instruction Manual, Page: 93 / 190

6700SR Refrigerated Sampler
75
Replacing the Internal Battery
A Lithium battery housed inside the controller maintains power to
the sampler’s memory when the controller is disconnected from a
power source. If it discharges completely, the sampler win lose all
program settings and all data stored in memory when the external
power source is disconnected. The battery requires replacement ev-
ery five years. The sampler displays a warning within one month
of its expected life to alert you to the battery’s impending expira-
tion. The warning appears each time you turn the sampler on until
you reset the alarm. When you reset the alarm, the sampler resets
the warning to a date 59 months from the current date.
To replace the internal battery:
1. Open the controller case (see Opening the Controller Case on
page 73).
2. Lift the desiccant box from the case ( Figure 15 ).
3. Remove the EMI shield and grounding straps by loosening
the five
1
/
4
-inch stop nuts.
4. Disconnect the module, liquid detector, and pump count con-
nectors from the main circuit board ( Figure 16 ).
5. Remove the three screws and the
1
/
4
-inch stand-off attaching
the main circuit board to the case.
6. Detach the main circuit board from the keypad connector by
pulling gently upward on the edges of the board next to the
connector. Pull the main board up until the keypad connector
is almost even with the edge of the case. Next, detach the main
circuit board from the connector board.
7. Desolder the lithium battery, using care to prevent damage
to the circuit board. Insert the replacement battery and sol-
der it in place.
8. Reconnect the main circuit board to the connector board be-
fore reconnecting it to the keypad. Replace the
1
/
4
-inch stand-
off and the three screws, and reconnect the module, liquid de-
tector, and pump count connectors.
9. Replace the EMI shield and grounding straps. Reconnect the
two distributor connectors.
10.Ensure that all connections and hardware are secure. Re-
place the desiccant and close the case.
11.Reset the battery alarm.
Battery Warning
Isco recommends you replace
the battery every five years, as
soon as the battery warning
appears. To insure that the re-
placement meets Isco’s speci-
fications, use only Isco re-
placement batteries. (See Ap-
pendix D, Replacement Parts.)
WARNING!
REPLACE INTERNAL
BATTERY BEFORE
17-OCT-97
Note
The circuit boards can be dam-
aged from a discharge of static
electricity. Always use an anti-
static mat when opening the con-
troller to protect the circuit
boards.
Poor soldering techniques can
easily damage a printed circuit
board. The battery should be re-
placed by a skilled technician.
CAUTION
Note