Agilent Technologies 85032B/E 50 Specifiche Pagina 180

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Troubleshooting and Block Diagrams 8712ET/ES and 8714ET/ES
Category 4 Failures: Peripheral Device Problems RF Network Analyzers
4-38 Service Guide
Category 4 Failures: Peripheral Device Problems
DIN Keyboard
If a DIN keyboard interface test failure was reported during power-up, there may be a
problem with the +5 V power supply for the DIN keyboard.
Verify that the keyboard is connected properly. (If necessary, use a DIN (f) to mini-DIN (m)
adaptor.) Make sure that the keyboard is compatible with the analyzer. The analyzer
should work with HP mini-DIN keyboards that are U.S. English versions, and most (but
not all) IBM PC/AT compatible keyboards. Connect the keyboard to a computer or another
analyzer to see if it is functioning, or try using a different keyboard.
Some keyboards draw excessive current on the +5 V power supply and cause the
self-healing fuse on the CPU board to open. If the self-healing fuse opens, node 29 on the
Analog Bus will measure well below 4.5 V. See Table 5-4 on page 5-16.
If you determine that the keyboard interface is defective, replace the CPU board (refer to
“Removing the CPU Board Assembly” on page 3-6).
RS-232 Printers and Plotters
If an RS-232 interface problem was reported during power-up (with no peripheral
connected), there may be a problem with the RS-232 portion of the Super I/O chip, U607,
or its clock, U606. Replace the CPU board (refer to “Removing the CPU Board Assembly”
on page 3-6).
Make sure the printer's or plotter's line power is switched on, that it has paper and pens,
that its pinch wheels are down, etc. Plotters should not be in VIEW mode. Verify that the
RS-232 device has been selected as the hardcopy device by pressing
. The highlighted line shows the current device selection. Baud rate,
parity, and handshake information can be accessed by selecting the corresponding softkeys
on the right side of the CRT. If any of this is incorrect, enter the correct information. Refer
to the printer or plotter manual for proper parameters. Refer to your analyzer's User's
Guide for more details on hardcopy options.
Try to make a print or plot from another instrument or a computer to confirm that the
printer/plotter is working. If it is, replace the CPU board.
Floppy Disk Drive Maintenance
Depending on the environment your analyzer is in, airflow from the front panel can cause
a disk drive to become dirty. A dirty disk drive can have a symptom of not reading or
writing to the floppy disk. The failure is usually intermittent.
A regular cleaning schedule should be adhered to. A commercially available disk cleaning
kit is recommended. Replace the disk drive if cleaning does not restore the drive to full
operation. Refer to “Removing the 3.5" Disk Drive Assembly” on page 3-22, for a detailed
procedure to remove the floppy disk drive.
HARDCOPY
Select Copy Port
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