Thermo Scientific SAM12, Manual

Page: 153 / 176

Issue: 1.0 Maintenance and Trouble Shooting
Thermo Fisher Scientific SAM12 User Manual 11-5
CARE SHOULD BE TAKEN AT ALL TIMES NOT TO
SHORT THE BATTERY TERMINALS
The battery is a sealed lead/acid jelly type construction and
does not require regular maintenance. If however, it requires
replacement, proceed as follows:
Switch off the power, switch off the SAM12 and remove the
top cover as described in
Removal of the Top Cover (page 11-
3) . Disconnect the thermistor assembly from the negative
BLACK terminal marked - first, taking care not to short it to
the + terminal. Disconnect the red wire from the positive RED
+ terminal taking care not to short it to the - terminal. Remove
the holding bracket by undoing the two mounting screws and
then remove the battery. Dispose of it safely as required. The
battery should be replaced only with one of a similar type or
operation of the SAM12 may be impaired.
When refitting the battery, make sure the mounting bracket is
be properly secured. Reconnect the red wire to the RED +
terminal first.
ENSURE THAT ANY PROTECTIVE SAFETY BOOT IS
REFITTED CORRECTLY OVER THE RED + POSITIVE
BATTERY TERMINAL.
Reconnect the thermistor card to the BLACK - terminal last.
Failure to do this may impair charging control and may lead to
premature battery failure.
The battery contains hazardous substances; please take
care to dispose of the old battery in accordance with your
local regulations – in Europe Directive
2006/66/EC
.
Switch off the power and remove the top cover as described in
Removal of the Top Cover (page 11-3) . The charger PCB is
situated on the left hand side of the Electronics Chassis
immediately over the power supply. Before attempting to
remove the 5660A Charger board, ensure the mains supply is
disconnected and the SAM is switched OFF . Disconnect the
Battery cable from the 5660A board at PL3. Disconnect the
other cables, remove the four screws and washers securing the
PCB to its mounting spacers. The PCB is now free to be
removed from the Electronics chassis.
Replacement of the charger PCB is the reverse of the removal
procedure (PL3 last). Should the Charger PCB be thought to be
faulty it should be replaced with an identical unit (See
Recommended Spares List (page 12-1) ).
Battery - Removal and
Replacement
Battery Controller Board
Type 5660A - Removal and
Replacement
Replacement of the Charger
PCB