Service manual

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• When reinstalling the cable, be sure to line up the cable stripe over the hole marked with a square. Also, make sure the
pins are all properly aligned before reinstalling the connector.
Line Switch
• Remove the front panel (see Front Panel).
• Record the color code and location of each wire connected to the switch.
• Disconnect the wires from switch terminals.
• Release the locking tabs by pressing them inward against the body of the switch and remove the switch.
Modules
The module assemblies contain static sensitive components. Observe all standard electrostatic
procedures when disassembling the modules (see Chapter 3).
• Disconnect all wires connected to the back of the module.
• Disconnect all ribbon cables connected to the top of the modules.
• Loosen the 1/4-turn fastener at the front and the thumbscrew at the rear of the module. Remove the module by grasping
it with the 1/4 turn fastener and the thumbscrew.
• Place the module on the workbench chassis-side down.
• Rotate and remove the plastic fasteners under the module.
• Remove the two screws that secure the rear panel to the module's chassis.
• Remove the two screws near the ribbon cables that secure the power board to the module's chassis.
Note: The Agilent 60504B/07B have two additional screws at the bottom of the power board that secure the
power board to the chassis. Remove these also.
• Grasp the power board by the binding posts and the end opposite the binding posts. Slide the board slightly in the
direction of the binding posts to clear the input connector and carefully lift up on the assembly. The control board and
power board assemblies will now come apart.
Note: On the Agilent 60504B/07B you must disconnect the ribbon cable that connects the two boards before
you can completely separate the power board and control board assemblies. You must also remove the
control board from the chassis before you can reconnect the control board to the ribbon cable for
troubleshooting.
• When reassembling the module, do not fully tighten the screws until after all components are assembled.
Power Transistors (located on modules)
The power transistors on each module are comprised of subassemblies containing four transistors each. If any one of the
four transistors fail, the entire subassembly must be replaced .
• Disassemble the module (see Module).
• Remove the three screws that secure the defective subassembly to the heatsink.