17
Table 2 Test Unit Troubleshooting
Problem
Things to check
Countermeasure
Samples are not
heated.
The heater has an open circuit.
The heater has no open circuit.
Replace the heater.
Replace the heater
SSR.
The heater output
does not become
OFF.
Go to the I/O check mode, Set SSR “off”
and then RL “on”, Heater output become
on.
The heater output is 100% after a start.
Replace the heater
SSR.
Replace the MAIN
board.
The cooling fan does
not operate.
24VDC is supplied to the fan.
24VDC is not supplied to the fan.
Replace the cooling
fan.
Replace the fan SSR.
The projection lamp
does not light.
A DC voltage (0-10V) is supplied to the
lamp.
No voltage is supplied to the lamp.
Replace the lamp.
Replace the MMB
board.
The receiving light
quantity is small.
(Occurs after starting
measurement)
Light is reaching the receivers.
Light is not reaching the receivers.
Replace the light
receiver assembly.
Adjust the lamp
position to project light
to the detectors.
