123200 03 26-03-2004 21
Error: Switch test does not work.
Likely cause: Solution:
Defective I/O PCB:
• Check signal from switch test
input. The voltage between
CN2 terminal 1(+) and CN2
terminal 2(-) on the
CONTROLLER PCB changes
from 0V to 5V when the switch
test input changes from closed
to open.
If the signal does not change
and the voltage between CN1
terminal 3 (+) and CN1 terminal
4(-) on the I/O PCB is 5V,
replace the I/O PCB.
• Otherwise, replace the
CONTROLLER PCB and
adjust and re-calibrate the unit.
Error: Calibrator does not cool or heat sufficiently (CTC-140 A
and MTC-140 A only).
Likely cause: Solution:
Defective well:
• Set the SET temperature to
-40°C.
Measure the voltage between
CN6 terminal 1(+) and terminal
2(-) and the voltage between
CN3 terminal 1(+) and terminal
2(-).
If the voltage on CN3 is higher
than 18V, replace the well and
re-calibrate the unit.
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