Ametek JOFRA ATC-650 B User Manual (English)

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Questions and Answers:

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David BrownAug 20, 2025
How to fix no light in display error in Ametek JOFRA ATC-650 B Measuring Instruments?
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  Steven MooreAug 20, 2025
  If the Ametek Measuring Instruments display shows no light, begin by inspecting the fuses in the mains inlet. Then, check the fuses located on the Power PCB: F1 – F6 for ATC-125, F1 – F7 for ATC-140/155/156/157, and F1 – F7 for ATC-250/320/650. Also, check the supplies and replace the Power PCB if necessary, as a defective regulator on the Power PCB could be the cause.
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Brooke FrazierAug 23, 2025
What to do if stirring motor is not pulling stirring magnet in Ametek Measuring Instruments ATC-140/250 A/B?
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  yhillAug 23, 2025
  To resolve the issue of the stirring motor not pulling the stirring magnet in Ametek Measuring Instruments ATC-140/250 A/B, set the stirring speed to 50. Measure the voltage across CN11 on the ATC-250 and CN13 on the ATC-140; it should be approximately 18V. If the voltage is correct, replace the motor. If there's no signal, check for a 5V signal on (ATC-140 Power PCB CN9 pin 11) or (ATC-250 Power PCB CN3 pin 11). If the 5V signal is present, replace the Power PCB; otherwise, inspect the ribbon cable and Main PCB. Also, if the stirring magnet has a flat side due to wear, replace it.
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Misty WeaverAug 30, 2025
What should I do if my Ametek JOFRA ATC-650 B ATC-155 isn't cooling or heating enough?
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  Sarah AndrewsAug 30, 2025
  To address the issue of the calibrator not cooling or heating sufficiently (ATC-155 only) on Ametek Measuring Instruments, set the temperature to –50°C. On the power PCB, measure the voltage between CN8 terminal 1(+) and terminal 2(-) and the voltage between CN1 terminal 1(+) and terminal 2(-). If the voltage on CN1 is higher than 30V, replace the well and recalibrate the unit. If the voltage on CN8 is 0.45V ±0.01V and the calibrator does not cool down sufficiently, replace the well and recalibrate the unit. If the voltage on CN1 is less than 30V and the voltage on CN8 differs from 0.45V ±0.01V, adjust R9 until the voltage is 0.45V ±0.01V. If it is impossible to adjust the voltage on CN8, replace the Power PCB.
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Carolyn HaleySep 1, 2025
What causes no readout in display error in Ametek JOFRA ATC-650 B Measuring Instruments?
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  Randall ThompsonSep 1, 2025
  If the Ametek Measuring Instruments display shows no readout, check the ribbon cable between the Main PCB and the display PCB. Also, check the ribbon cable between the display PCB and the display module, as the communication between the CPU and the display may be defective.