Midmark Preva - Page 77

Troubleshooting
Preva
70
Troubleshooting
Electrical Performance Issues
General
Information
Test Equipment
Electrical measurements require specific meter test probes. Use small test clips,
such as Pomona Electronics Minigrabber Test Clip Model 6248 or Radio Shack
Mini-Hook Adapters catalog # 270-334, or the equivalent.
Replacement Parts
 Kit, Power Supply Board 30-A2155
 Logic Board 30-08160
 Operator Panel Board 30-08054
 25 foot Communication Cable E1-13003
 6 inch Communication Cable E1-13004
 Rocker Switch E1-19026
 Yoke Cable Assembly 30-08071
 Tubehead Assembly 30-A1027
 Ribbon Cable Assembly 30-08072
Note
 If you replace the Operator Panel Board 30-08054, you must re-program any
customized technique factors, as explained in the System Configuration
section of this manual.
 If you replace the Logic Board 30-08160 or the Tubehead, and the firmware
revision is 5.0 or less, you must recalibrate the system. Please contact
Midmark Technical Support for instructions.
The Preva system has the capacity to store electrical energy
during operation and after the system has been turned off.

The Preva system will store energy for approximately three
minutes after removal from power lines.

Before attempting service within the system, observe the
green LED “D11” of the Power Supply Board. Illumination
represents the presence of stored energy.

As an added safety practice, it is recommended to measure
for the presence of DC voltage across TP8 and TP5 of the
Power Supply Board.
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