BEAMEX TC303, Руководство по обслуживанию

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B - 10 TC305/TC303 - Service
3.5.3 Processor boards
The two processor boards are located on the bottom of the calibrator. The main
processor board is on the left side and the temperature processor board is on the
right side (front view).
Fault on a processor board may cause many different symptoms. It may stack
while showing the 'SELF TEST' prompt, or before showing any special display. It
may switch off automatically without any obvious reason or you may even be
unable to switch it off at all.
If processor fault occurs only once, it may be result of an extremely strong
interference from other electrical circuits or devices. If the fault repeats often, the
faulty processor board must be replaced.
If you can't switch the calibrator off, loosen one of the battery wires from the
power supply board and loosen the battery charger from the calibrator. When you
reconnect the battery wire, you should be able to switch the calibrator on again.
When the batteries have been disconnected, TC305/TC303 loses the contents of
the read/write memory as well as the real time clock time and date.
3.5.4 Optional 24V supply board
If you have the 24V option and the calibrator works otherwise right, but there is no
24V output, the fault is on the 24V option board (or in cabling).