A1 Main Board Removal; Removal Procedure; A2 Cpu Board Assembly Removal - Agilent Technologies 4339B Service Manual

A1 Main Board Removal

Removal Procedure

1. Remove the A2 CPU Board Assembly while referring to \A2 CPU Board Assembly
Removal".
2. Disconnect the following cable assemblies from the A1 assembly.
a. Four cable assemblies from the front panel
b. The cable assembly from the transformer
c. Two cable assemblies from the DC-DC Converter
3. Disconnect the four optical ber cables which are connected to the A3 Ammeter Board
Assembly
4. Disconnect the four optical ber cables from the A3 Ammeter Board Assembly
Caution
To avoid damaging on the optical ber cable caused by bending or other
mechanical stress, remove all the ber cables from the 4339B when replacing
either the A1 board or the A3 board.
5. Remove the cable clamp on the shield case which surrounds the A3 board.
6. Remove the nut which fastens the Ext Trigger connector on the rear panel.
7. Remove the screw which secures the A1 board to the chassis side.
8. Remove the four studs, that secure the A1 assembly to the chassis, by rotating the studs
with a at bladed screwdriver.
9. Remove the three screws that secure the A1 assembly to the chassis.
10. Remove the A1 assembly from the chassis.

A2 CPU Board Assembly Removal

Removal Procedure
1. Remove the cover while referring to \Cover Removal".
2. Disconnect the four atcable assemblies and the wire assembly from the A2 board.
3. Remove the four screws that secure the A2 board to the stud.
4. Remove the A2 board from the chassis.
Note The ROM and EEPROM on the A2 assembly may be transferred to the new
assembly to minimize the repair time and parts cost. Refer to \Replacing the
A2 CPU Board Assembly" for more information.
3-12 Assembly Replacement