Thermo Scientific SAM12 Manual page 161

Issue: 1.0
Unit "dead" (will not boot
up) & charging LED is OFF
Unit "dead" (will not boot
up) & charging LED is ON
Thermo Fisher Scientific
If the display remains blank and unlit, no lamps are lit and no
sound is heard (assuming the volume has not been turned off) it
would indicate that the SAM12 is "dead".
LED OFF - indicates the AC mains supply is OFF and
instrument cannot run off the battery.
1. Check the fuse on the 5660A charger PCB, FS1.
2. If the fuse is intact, the battery is probably discharged.
Check the voltage at PL4 on the charger PCB. If it is
below 11.2 volts, the battery is discharged and the
charging supply must be restored before further
operation is possible.
Restoring the AC mains/charging supply - should light the
LED and allow the system to run while charging the battery.
1. Check the AC mains power cord is connected.
2. Check the fuse in the mains adapter (if fitted).
3. Check the power supply is receiving the mains supply.
4. Check the power supply output on 5660/PL4
(temporarily remove from pcb to check) - no output
indicates the internal fuse has blown and the power
supply should be replaced (see
Replacement of the Power Supply (page
5. Check the output on PL3 of the 5660A charger PCB - it
should be greater than +12.5 volts.
LED ON - indicates the AC mains supply is ON and should be
powering the instrument while charging the battery.
1. Retry switching the unit ON.
2. Check the fuse on the 5660A charger PCB, FS1.
3. Check the battery voltage is greater than 12.5 volts.
4. Check there is battery volts on OUTPUT connector
PL6. If no output is observed on PL6 a fault on the
Charger PCB is indicated and it should be replaced as
detailed in Section 11.2.5.
5. Check the power connections from the 5566A Charger
PCB to the 5565A Controller board.
6. Check the regulated +12 V, -12 V & +5 V outputs from
the DC-DC converter module 5675A. The DC-DC
module is not user serviceable and if faulty the
Converter board should be replaced as described in
Controller Board type 5670A - Removal and
Replacement (page
Maintenance and Trouble Shooting
Removal and
11-4).
11-6).
SAM12 User Manual 11-13