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Service
Model 11869A
8-9.
TROUBLESHOOTING
8-10,
Troubleshooting the 11869A Plug-In Adapter to the component
level is not recommended. A board replacement kit, HP part number
11869-60009,
is available, which includes circuit boards Al and A2
and cables Wl, W2, W3, W4, and W5. A cable replacement kit, HP part
number 11869-60024,
is also available, and includes W3, W4, and W5.
Both kits are listed at the end of the Replaceable Parts List in
Section VI of this Manual. Purchase of a replacement kit is usually
more cost-effective than troubleshooting to the component level.
However, schematic diagrams and circuit descriptions are provided in
case component-level troubleshooting is preferred.
8-11.
THEORY OF OPERATION
8-12.
A parts location diagram and a detailed circuit description of
the operation of each circuit board is provided with each foldout
schematic diagram.
8-13.
Figure 8-2 shows the interconnections between the 8350A
Mainframe,
the 11869A Adapter, and the 86200 series RF Plug-In. The
11869A adapts the 86200 series RF Plug-Ins for use with the 8350A
Sweep Oscillator Mainframe. Some signals and power lines go directly
through the 11869A without any modification. Other signals must have
amplification or level shifting circuits in the signal path to make
them adaptable to the next circuit. The signal lines into and out of
the 11869A are shown in the Overall Block Diagram, Figure 8-3.
8-14.
Figure 8-4 is a block diagram of the Self-Test circuit, which
checks the connections between the Mainframe and the Plug-In. This
circuit responds to the 8350A Mainframe when a Self-Test sequence is
initiated by the operator or by power turn-on.
8-15.
Another function of the 11869A is to decode and transmit to
the Mainframe the model number code of the RF Plug-In being used.
This is interpreted into the correct frequency sweep range in the
8350A Mainframe. For a standard Plug-In the code is supplied by the
Plug-In Identification Switch, and for a factory-modified Special
Plug-In the code is supplied by the PROM U6. Figure 8-5 is a block
diagram of the decoding circuit.
8-16.
A Cable Interconnect Schematic is provided in Figure 8-10.
Figure 8-11 shows Major Assembly locations.
8-2
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