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Principles of Operation
33
A10 Auxiliary Power Supply
The 300 Vdc is used by the A10 board to generate the bias voltages. The 300 Vdc input line is fused by a 1 ampere
subminiature fuse, A10F1. The A10 supplies an isolated +5 Vdc for the A7 GPIB/RS232 interface board and A11 front
panel board. The + 15 VSW dc to the A4 mother board via J2, the +/-15V and +5Vsec to the A6 servo board via J4 and
+5V sec to the A8 DSP board via J5. It also supplies the 12-24 Vdc for the fan speed control. All secondary bias winding
are fused with 1 ampere subminiature fuses A10F2 through A10F7. This assembly is not component level repairable except
for fuses. This assembly is interchangeable between an Agilent 6814B and 6834B.
A11 Front Panel Display Assembly
The A11 assembly contains the display assembly, keypad, rotary pulse generators (RPG) and digital logic circuits, CPU and
ROM. This assembly is not component level repairable. This assembly is interchangeable between an Agilent 6814B and
6834B.
A12 Input Filter Assembly
The A12 assembly contains resistor / capacitor networks connected line to line to reduce any magnetic noise from being
conducted back into the AC input mains.
A13 Bridge Capacitor Filter Assembly
The A13 assembly contains capacitors and surge protectors connected line to line and a common mode inductor and surge
protector connected in series with the + 300 Vdc bus. The filter is connected to reduce conducted and radiated noise
generated by the three-phase rectifier.
A14 Bias Power Supply
This assembly is only used with the 400 volt input option. The A12 board provides the ac voltages required for the low
voltage regulators and the +24 Vdc for the current limit relays on the A9 board. It also provides the +/-15VSW to the A10
Auxiliary board. Fuse F1 for the +24 Vdc, a LED will light on the A12 board if F1 opens. Fuse F2 and F3 for the +24 Vdc
and + 16 Vdc. F4 and F5 for the +/-15VSW. F6 and F7 for the + 15 Vdc / -5 Vdc regulators. This assembly is
interchangeable between an Agilent 6814B and 6834B.