Ametek JOFRA ATC-125, Service Manual

Page: 24 / 89

24 18-09-2007 122770 06
Error: Calibrator does not cool or heat sufficiently
(ATC-140/156/157 only).
Error message: -
Likely cause: Solution:
Defective well Set the SET temperature to –50°C.
On the Power PCB measure the voltage
between CN3 and CN6 terminal 1(+) and
terminal 2(-) and the voltage between CN1
and CN4 terminal 1(+) and terminal
2(-).
If the voltage on CN1 and CN4 is higher
than 30V replace the well and re-calibrate
the unit.
If the voltage on CN3 and CN6 is 0.33V
±0.01V and the calibrator does not cool
down sufficiently, replace the well and re-
calibrate the unit.
Defective Power PCB If the voltage on CN1 is less than 30V and
the voltage on CN3 differ from 0.33V
±0.01V, adjust R6 until the voltage is 0.33V
±0.01V.
If it is impossible to adjust the voltage on
CN6, replace the Power PCB.
If the voltage on CN4 is less than 30V and
the voltage on CN6 differ from 0.33V
±0.01V, adjust R16 until the voltage is
0.33V ±0.01V.
If it is impossible to adjust the voltage on
CN16, replace the Power PCB.