Agilent Technologies 85032B/E 50 Specifiche Pagina 159

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8712ET/ES and 8714ET/ES Troubleshooting and Block Diagrams
RF Network Analyzers Category 1 Failures: Dead or No Display
Service Guide 4-17
Front Panel Problems
If the analyzer appears to power-up normally but will not respond to keystrokes, verify
that none of the keys are stuck. If the front panel keys are still not responding properly,
remove the front panel and make sure the ribbon cable is properly connected between the
front panel assembly and the CPU.
Inspect the keypad and the PC board. Replace both if either assembly is defective. The
large knob assembly can be replaced separately. Inspect the ribbon cable closely and verify
that it is in good condition. Try removing the ribbon cable clamp located on the CPU board
to verify this is not causing a short.
If an inspection of the front panel assembly reveals no obvious defects, replace the CPU
board (refer to “Removing the CPU Board Assembly” on page 3-6).
Other Power-Up Problems
A power-up sequence problem can also be caused by a problem with the SRAM. Since the
symptom will depend on what state the analyzer was in during its power-up sequence,
there can be a variety of problems. Try clearing the SRAM (see “Clearing the Nonvolatile
SRAM” on page 4-16 for instructions). If the problem persists, the DRAM is probably bad
and/or the CPU board needs to be replaced (refer to “Removing the CPU Board Assembly”
on page 3-6).
Other Error Messages
In some unusual cases, an error message similar to that shown below may occur. This may
indicate a defective component, an anomaly in the firmware code, or an unspecified
operating condition. In general, however, this message should never be seen. If it does
appear, follow the instructions, then cycle power. If the problem reoccurs, try clearing
SRAM (see “Clearing the Nonvolatile SRAM” on page 4-16). If the problem still exists, try
reloading the firmware. If the problem persists, contact the nearest Agilent Technologies
sales or service office for further instructions.
| ********************************************* |
| UNRECOVERABLE ERROR: |
||
| Please report the error "xxxx.nn" |
| to your local Agilent Service or Sales office.|
||
| To help us fix this problem quickly, |
| please note what you were doing when |
| this error occurred. Any related operating |
| information might be helpful, such as: |
| Measurement type, # points, |
| IBASIC and SCPI commands, |
| printer and disk info, etc. |
||
| Thank you for reporting this error. |
| Cycle power to continue. |
| ********************************************* |
The error number is in the form “xxxx.nn”, where nn is a number from 0 to 31, and xxxx is
one of these names:
ARRY DBUG FPKP HPIB IBAS IBSL IBfp IBkr
MMGR PLOT SELB TCH1 TCH2 TIME idle root
Examples include: ARRY.04, FPKP.08, and TCH1.10 among other types.
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