Thermo Scientific SAM12, Manual

Page: 154 / 176

Maintenance and Trouble Shooting Issue: 1.0
11-6 SAM12 User Manual Thermo Fisher Scientific
Switch off the power, power down the SAM12 and remove the
top cover as described in
Removal of the Top Cover (page 11-
3) . The 5670A Controller board is situated in the front centre
of the Electronics Chassis, adjacent with the loudspeaker.
Before attempting to remove the Controller board, ensure the
power cable is removed from PL13. To remove the PCB, first
disconnect all the cables around the periphery of the board.
Remove the two screws retaining the PCB to its mounting
spacers. The PCB is now free to be removed from the
Electronics chassis.
Replacement of the Controller PCB is the reverse of the
removal procedure. Should the Controller thought to be faulty
it should be replaced with an identical unit (See
Recommended
Spares List (page 12-1) ).
Set the Link and Switches as follows:
LK1
● ●
● ● ● LK2
LK3 ● ● ●
LK4 ● ● ●
● ● ●
LK5
● ● ● LK6
● ● LK7
● ● LK8
WARNING: THE HV & AMPLIFIER PCB’S GENERATE
DANGEROUS HIGH DC VOLTAGES. EXERCISE
CAUTION WHEN SERVICING, ALWAYS ALLOW THE
HV TO DISCHARGE BEFORE COMMENCING WORK.
Switch off the power and remove the top cover as described in
Removal of the Top Cover (page 11-3)
The FHT681 cards (4 maximum) are mounted vertically in line
on the right hand side of the electronic chassis. They are
Controller Board type
5670A - Removal and
Replacement
Replacement of the Controller
board
FHT681 cards - Removal
and Replacement