
8712ET/ES and 8714ET/ES Troubleshooting and Block Diagrams
RF Network Analyzers Introduction
Service Guide 4-5
Figure 4-2 Connecting the Extender Board
Initial Observations — Normal Power-up Sequence
Prepare the analyzer for observation by performing these steps:
1. Disconnect all accessories and peripherals.
2. Remove the disk (if any) from the internal disk drive.
3. Connect a known-good cable between the RF OUT/PORT 1 and RF IN/PORT 2 ports.
Switch on the analyzer and watch for the proper power-up sequence:
1. Immediately after the analyzer's line power is switched on, the disk drive light
activates briefly and a “beep” is audible from the CPU.
2. The CRT lists the bootROM self-tests being performed. (The CRT may take a few
seconds to warm up.) If all bootROM self-tests pass, the analyzer beeps twice.
3. The disk-drive light illuminates briefly and the firmware loads from ROM.
4. The analyzer runs all of the remaining self-tests and the CRT displays the PASS/FAIL
status of the self-tests.
5. During the next few seconds, these messages appear on CRT:
•
Initializing
• Calculating correction coefficients
• Other messages may appear briefly, depending on the analyzer's state at the time
that the power was switched off.
6. Information on the model number, firmware revision, and installed options is displayed.
The graticule may also be displayed, depending on the analyzer's power-down state.
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