Thermo Scientific SAM12, Manual

Page: 152 / 176

Maintenance and Trouble Shooting Issue: 1.0
11-4 SAM12 User Manual Thermo Fisher Scientific
When refitting the 5689A Electronics Chassis in the Main
Frame, ensure:
•
All four fixing bolts are fitted and tightened.
•
The HV & Amplifier boards are covered with the
protective lid.
•
The detector cables are correctly terminated with their
respective amplifiers.
•
All earth Connections are securely fitted.
•
The top cover is fitted and all fixings are tight.
These requirements are mandatory and necessary for continued
EMC performance and user safety.
IMPORTANT: BEFORE ANY WORK STARTS ENSURE
THAT THE MAINS SUPPLY IS DISCONNECTED FROM
THE SAM12 AND THE SAM12 IS POWERED OFF.
The mains power supply for the SAM12 is mounted at the rear
of the electronics chassis on the left hand side.
Having first disconnected the mains supply and removed the
cover from the Electronics chassis as described in
Removal of
the Top Cover (page 11-3) , deflect the restraining plastic on the
PSU to one side to release the module from the aluminium
bracket supporting the 5660A. Unplug PL4 from the 5660A
and gently ease the PSU and cable from under the bracket.
Remove the two wires connected to the mains filter and
disconnect the earth cable from the Central Earth Point.
Finally, remove the wires from the PSU connecting with plug
PL4.
The Power Supply module contains dangerous high switching
voltages and is not user serviceable. It should be returned to
Thermo-Fisher Scientific’s service department for repair or
replacement.
Ensure the correct type of replacement power supply is used
(See
Recommended Spares List (page 12-1) ). Replacement of
the Power Supply is the reverse of the removal procedure. If
the Power Supply is thought to be faulty it should be replaced
with an identical unit (See
Recommended Spares List (page 12-
1) ). Replace the connections ensuring all the clamping screws
are tight and all GROUND/EARTH connections are made.
There is no PSU adjustment
Removal and Replacement
of the Power Supply
Power Supply Replacement
Adjustment of PSU