CHAPTER 6
TROUBLESHOOTING
The Model 48C has been designed to achieve a high level of reliability. Only premium
components are used, thus complete failure is rare. In the event of problems or failure,
the troubleshooting guidelines presented in this chapter should be helpful in isolating the
fault(s). The Service Department at Thermo Environmental can be consulted in the event
of problems at (508) 520-0430. In any correspondence with the factory please note the
serial number of the instrument.
CAUTION:
Some internal components can be damaged by small amounts of static
electricity. A properly grounded antistatic wrist strap must be worn while handling any
internal component. For more information about appropriate safety precautions, see
Chapter 7, “Servicing.”
TROUBLESHOOTING GUIDE
MALFUNCTION POSSIBLE CAUSE ACTION
Does not start up No power Check that the instrument is
plugged into the proper source
(115 or 220 volts)
Check instrument fuse
Power supply Check voltages from power
supply
Digital electronics
defective
Check that all boards are
seated properly
Replace boards one at a time
with spare boards to isolate
the faulty board
6-1
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