Maintenance
Front/Rear Binding Post Reconfiguration
4
4-9
4-15. Digital Assembly Removal and Installation
Remove the CPU Assembly or the Digital Power Supply Assembly by pulling straight up
at the top corners of the assembly. In relation to the chassis side, the CPU Assembly
components face toward, and the Digital Power Supply Assembly components face away.
See Figure 4-5.
4-16. Power Transformer Removal and Installation
Use the following procedure to remove the Power Transformer assembly:
1. Remove the Calibrator Front and Rear Panels.
2. Remove the Digital Power Supply (A19) and CPU (A20) assemblies.
3. Detach the five connectors leading from the Power Transformer assembly to the
Digital Motherboard. The three connectors at the rear of the assembly may not be
accessible without first removing the rear fan. With the two digital assemblies (A19
and A20) removed, the four Phillips head screws securing this fan can be accessed
through holes in the chassis side.
Note that no two Power Transformer connectors are the same size and that each
connector is keyed; re-connection only involves matching appropriate connectors.
4. Working from the bottom of the instrument, remove the Digital Motherboard (A4)
assembly.
5. Remove the eleven screws securing the Power Transformer assembly, as follows:
• Rear Panel: two screws, which were removed along with the Rear Panel.
• Front Panel: two screws.
• Top Edge: four screws.
• Bottom Edge: three screws.
6. Remove the Power Transformer assembly.
To install the Power Transformer assembly, reverse the preceding six steps.
4-17. Hybrid Cover Removal
When removing the plastic covers from the hybrid assemblies, push the ends of the cover
retainer pins through from the back of the circuit board. The retainer pins can be damaged
by attempting to pull the covers off.
4-18. Front/Rear Binding Post Reconfiguration
An internal cable can be configured for output connections at either the front or rear
binding posts. The front binding posts are usually connected at the factory. If the rear
binding posts are connected at the factory, a decal describing this arrangement is attached
to the front binding posts. The procedure that follows can be used to swap an existing
binding post configuration; it is to be done only at Service Centers. The following
procedure can be used to change front-to-rear or rear-to-front.
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