A7 Midplane Board Assembly; Midplane Board Connections - Agilent Technologies N9039A Service Manual

Assembly Descriptions

A7 Midplane Board Assembly

A7 Midplane Board Assembly

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 (+3.3V_A)
• -5.2V analog linear power supply regulation (-5.2V_A)
• 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.

Midplane Board Connections

Connector Connects To
J101 A6 Power Supply Assembly
J102 A6 Power Supply Assembly
J103 A6 Power Supply Assembly
J104 A6 Power Supply Assembly
J105 A6 Power Supply Assembly
J106 A6 Power Supply Assembly
J107 A6 Power Supply Assembly
J108 A6 Power Supply Assembly
J109 A6 Power Supply Assembly
J110 A6 Power Supply Assembly
102
Connector Connects To
J111 A6 Power Supply Assembly
J112 A6 Power Supply Assembly
J201 A4 Processor Assembly
J202 A4 Processor Assembly
J203 A4 Processor Assembly
J204 A4 Processor Assembly
P1 A8 Motherboard Assembly
P2 A8 Motherboard Assembly
P3 A8 Motherboard Assembly
P13 A8 Motherboard Assembly
Chapter 3