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MCA166-USB
7 Troubleshooting
General Remark:
Before changing anything concerning the hardware, plugging or pulling cables etc. shut
down the high voltage and switch off the MCA.
Soldering or manipulating with the SMD boards is strongly not recommended for users.
We have specialists for that. If you have a problem which cannot be solved by the table
below, contact us. If it is really a hardware fault, we can repair this for a fair price.
1. Software tells "MCA not connected!"
● Switch on the MCA
● Check cable between MCA and Computer. Serial cable may be loose or not
connected. Connect cable correctly
● Check MCA battery. Charge MCA battery
● The MCA is not recognized (”MCA not connected”) running MCA DOS Software
in a DOS Box on Notebooks
● Disable Power Save Mode for COM Port
2. MCA lamp does not flash regardless if the switch is on or off
● MCA battery empty. Charge MCA battery.
● The MCA firmware programming switches are in a wrong position. The firmware
programming switches must be all in ”off” position. Do not play around with
them!
3. MCA lamp flashes irregularly, Computer tells "MCA power failure" or beeps
● MCA battery very low. Charge MCA battery.
● MCA internal or communication error. Switch off and on MCA, restart software.
4. Power Supply Error: Goto Diagnostics, Measurement is not possible
● MCA battery very low. Charge MCA battery and switch on HV and preamplifier
supplies again.
● Go to diagnostics, blinking power supply currents indicate overload.
● Short circuit in detector? Check if detector is defective. Disconnect detector, try
again. (Do not pull or plug connectors when MCA is on!) Change detector.
● Too power-hungry preamplifier. A fully charged MCA battery may help
sometimes. Otherwise you have to exchange the preamplifier.
● If the diagnostics menu shows irregular high currents or even overload although
there is no detector connected to the MCA and the battery voltage is ok, there
may be a fault in the internal power supply. Contact GBS for repair.
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