Thermo Scientific SAM12, Manual

Page: 151 / 176

Issue: 1.0 Maintenance and Trouble Shooting
Thermo Fisher Scientific SAM12 User Manual 11-3
software. However, continued occurrence of this fault would
suggest a serious problem that needs reporting to Thermo
Fisher Scientific’s service department.
Servicing of the Electronics Chassis - Type
5689A
The Electronics Chassis contains the Power Supply module,
battery, Charger PCB, Controller board and four HV and
Amplifier Pcb’s. Mounted on the front panel are the LCD
Display and inverter, loudspeaker, keypad, start button and
indicator lamps.
NOTE: AS A MATTER OF GENERAL ELECTRICAL
SAFETY AND FOR CONTINUED EMC PERFORMANCE,
ANY EARTH TAGS, WIRES, CONNECTORS OR COVERS
REMOVED FROM ANY PART OF THE SAM12 IN THE
COURSE OF SERVICING, MUST BE REFITTED. CARE
SHOULD BE TAKEN AT ALL TIMES NOT TO SHORT
THE BATTERY TERMINALS.
CAUTION: SWITCH OFF THE MAINS SUPPLY TO THE
SAM12 AND WAIT 1 MINUTE AFTER SWITCHING
DOWN THE SAM12 BEFORE REMOVING THE TOP
COVER.
To gain access to the 5689A Electronics Chassis components
the Top Cover must be removed. To do this remove the 2
screws securing the top cover to the Electronics chassis. Lift
the top cover clear of the Electronics chassis.
When carrying out major Servicing work on the 5689A
Electronics Chassis, it may be advantageous to remove it from
the SAM12. The chassis is quickly and easily removed from
the main frame as follows and since the assembly is complete,
stand-alone testing is also possible. Remove the top cover as
described in
Removal of the Top Cover (page 11-3) .
Disconnect the detector coaxial connectors from the HV and
Amplifier pcbs. Disconnect the door micro switch and locking
gear cables (if fitted). Remove the protective cover from the
HV & Amplifier pcbs. Release the four bolts securing the
Electronics chassis to the Main Frame. The Electronics Chassis
is now free and may be lifted clear of the Main Frame.
CAUTION: THE ELECTRONICS CHASSIS TYPE 5689A
WEIGHS ABOUT 45 LBs (20KG) SO CARE IS REQUIRED
WHEN LIFTING IT OFF THE MAIN FRAME.
Removal of the Top Cover
Removal of the Electronics
Chassis from the Main
Frame