Electronics; Cautions; Electronics Pan - GE Medical Systems PRODIGY Service Manual

2.1

Electronics

2.1.1 Cautions

2.1.2 Electronics Pan

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PRODIGY Service Manual (Rev C - 2000)
PRODIGY I electronics use Negative Temperature Coefficient (NTC)
thermistors to limit the in rush current of the AC isolation transformer and the
Detector Mother Board. These devices have a high resistance when cold and
decrease in resistance when warm.
Figure 2-10. PRODIGY I NTC thermistor on the Primary Terminal Block
• A cool down period of 30 seconds is required before power is turned on
on the system.
Note: The error log entry "DMB Power Cycle observed" is an
indicator that the DC power to the Detector Mother Board has
been interrupted and the system should be powered down for
30 seconds to restore power to the Detector Mother Board.
PRODIGY electronics are static sensitive,
take static control precautions before
servicing scanner circuitry.
PRODIGY I ONLY: Failure to allow the
system to "cool down" may cause the
circuit breaker for the AC line to trip and /
or the + 12VDC for the Detector Mother
Board (DMB) will not come up to +12 VDC.
PRODIGY I ONLY: The NTC's can get hot - they
are located on the AC terminal block and on the
DC terminal block be careful when servicing these
areas of the scanner.
System Overview 2-35