
Troubleshooting and Block Diagrams 8712ET/ES and 8714ET/ES
Introduction RF Network Analyzers
4-4 Service Guide
• non-shielded display ribbon cable used to connect the display when the A2 CPU board is
operated outside the chassis
• voltage reference source used to perform several adjustments. The source provides
±0.5 V, ±24 mV, and +10 V supplies.
• two “minimum configuration” bootROMs (one is for model 871xC)
• 7/32-inch wrench
• spare limiter to facilitate troubleshooting
How to Use the Extender Board
The CPU (A2), fractional-N/reference (A3), source (A4), and receiver (A5) board assemblies
can all be operated outside of the chassis with the extender board. This can be very helpful
if you are troubleshooting a problematic board or assembly.
The supplied display ribbon cable is needed to connect to the display if the CPU assembly
is connected to the extender board.
The SMB extension cables may be needed for the fractional-N/reference or source
assemblies.
The A4 source and A5 receiver assemblies will need two flexible SMA RF cables (not
supplied) to make the analyzer fully operational while either of these boards are connected
to the extender board.
To use the extender board, follow these instructions:
1. Loosen the two screws on the back cover of the analyzer.
2. Slide the cover to the right and remove it.
3. Attach the lower half of the extender assembly to where the cover was previously
located.
4. Align the hold-down screws and tighten securely; the board will not function if not
tightened sufficiently.
5. Attach the two ribbon cable connectors as shown in Figure 4-2.
The board under test plugs into the 96-pin connector. When properly connected, both the
top half of the extender assembly and the attached board under test can rest on top of the
analyzer.
NOTE If it is necessary to connect a computer to the analyzer while using the
extender board, then the GPIB connector extender (supplied) will be required
in order to make a connection.
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