N9030B PXA Signal Analyzer Service Guide 307
Power Supply/Midplane Troubleshooting
A7 Midplane Board Assembly Description
A7 Midplane Board Assembly Description
The A7 Midplane board assembly is used to connect the A4 Processor board
assembly and the A6 Power Supply assembly to the A8 Motherboard, and thus
the rest of the instrument electrical assemblies.
In addition, the A7 Midplane board also provides the following functions:
— Instrument power supply voltage test points and status LEDs
— +3.3V analog linear power supply regulation (+3.3VA)
— -5.2V analog linear power supply regulation (-5.2VA)
— Non-volatile memory for storage of the instrument model number, serial
number, and software license keys (Secure Storage).
— Power supply dithering. A triangle wave of approximately 100 Hz is
generated and goes directly to the A6 Power Supply assembly. This is used
to frequency modulate the power supply switching frequency for the
purpose of lowering any power supply related interference.
— Circuitry to phase lock the A4 Processor assembly CPU clock to the
instrument reference frequency.
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