230 Keysight Technologies N9040B UXA Signal Analyzer Service Guide
Power Supply/Midplane Troubleshooting
A7 Midplane Board Assembly Description
A7 Midplane Board Assembly Description
The A7 Midplane board is used to connect the A4 Processor board assembly
and the A6 Power Supply assembly to the A24 Motherboard Interconnect and
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.
Midplane Board Connections
Connector Connects To Connector Connects To
J2 A6 Power Supply Assembly J16 A4 Processor Assembly
J10 A6 Power Supply Assembly J14 A4 Processor Assembly
J9 A6 Power Supply Assembly J13 A4 Processor Assembly
J8 A6 Power Supply Assembly J18 A4 Processor Assembly
J7 A6 Power Supply Assembly J19 A4 Processor Assembly
J6 A6 Power Supply Assembly J24 A22 Wideband Digital I.F. (Opt B2X)
J12 A6 Power Supply Assembly J25 A22 Wideband Digital I.F. (Opt B2X)
J11 A6 Power Supply Assembly J26 A23 Wideband Digital I.F. (Opt B5X)
J5 A6 Power Supply Assembly J28 A23 Wideband Digital I.F. (Opt B5X)
J4 A6 Power Supply Assembly J32 A1A2 Front Panel Interface
J3 A6 Power Supply Assembly J921 A24 Motherboard Interconnect
J1 A6 Power Supply Assembly J920 A24 Motherboard Interconnect
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