8751A-22A
SUPERSEDES: 8751A-22
DATE: 13 June 1994
8751A Network Analyzer
Serial Numbers: 3146J00568 / 3315J00768
3146A00126 / 3315A00263
Modification prevents the 8751A from hanging up or generating an
unexpected reset
To Be Performed By: Agilent-Qualified Personnel
Parts Required:
Part No. Qty. Description
1820-8885 1 74ABT573
Situation:
If the Date Code of the A1U12 is “92xx” and the Mfr Part Number of the A1U54 is
“74F573” or “74BCT573”, the address error may occur, which hangs up the 8751A or
generates an unexpected reset.
Solution/Action:
Replace the A1U54 with the new one (Mfr Part Number: 74ABT573, Part Number: 1820-
8885).
1 of 3
AUTHOR: KI
ENTITY: 3355
© 1994 AGILENT TECHNOLOGIES
PRINTED IN U.S.A.
SERVICE NOTE
ADMINISTRATIVE INFORMATION
MODIFICATION RECOMMENDED
SERVICE NOTE CLASSIFICATION:
ACTION
CATEGORY:
LOCATION
CATEGORY:
CUSTOMER INSTALLABLE
ON-SITE
SERVICE CENTER
AGILENT RESPONSIBLE UNTIL: June 1996
ADDITIONAL INFORMATION:
IMMEDIATELY
ON SPECIFIED FAILURE
AGREEABLE TIME
AVAILABILITY:
PRODUCT’S SUPPORT LIFE
RETURN
SCRAP
SEE TEXT
SERVICE
INVENTORY:
RETURN
SCRAP
SEE TEXT
USED
PARTS:
STANDARDS:
Labor 1.0 Hour
Continued
Page 2 Service Note 8751A-22A
Procedure:
1. Disconnect the power cable from the 8751A.
2. Remove the top cover and the shield plate from the 8751A.
3. Remove the A1 board from the 8751A.
4. Check the Date Code of the A1U12 and the Mfr Part Number of the A1U54.
(The Date Code and the Mfr Part Number are printed on each part. See Figure 1.)
If the Date Code of the A1U12 is “92xx” and the Mfr Part Number of the A1U54 is
“74F573” or “74BCT573”, proceed to the next step.
5. Remove the old A1U54 (Mfr Part Number: 74F573 or 74BCT573).
Note:
When removing the old A1U54 from the A1 board, be careful
not to cut the printed-circuit pattern. to prevent damage to the
printed-circuit board, it is recommended that you cut all leads
first and then remove each soldered lead one by one.
6. Install the new A1U54 (Mfr Part Number: 74ABT573, Part Number 1820-8885)
7. Reinstall the A1 board in the 8751A.
8. Turn the 8751A ON and confirm the “POWER ON TEST FAILED” message is
NOT displayed.
9. Turn the 8751A OFF.
10. Reinstall the shield plate and the top cover on the 8751A.
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