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=== 5278 PSU === The 5278 has its own internal PSU. Verify rails at the appropriate test points inside the 5278 chassis. The 5278 needs: * '''+5 V''' for the vector graphics processor and frame buffer RAM. * '''+12 V''' for support logic. * Possibly a higher rail for the 75-pin output drive (manufacturer-specific). Refer to the 5278's internal service label for exact rail values.
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