8671B-08
SUPERSEDES: None
DATE: 15 September 1991
8671B Synthesized CW Generator
Serial Numbers: 0000A00000 / 3119A99999
Duplicate Service Notes:
8671B-08
8672A-25
Modification to improve power supply reliability
To Be Performed By: Agilent-Qualified Personnel
Situation:
It has been determined that connectors (P/N 1251-2313) may not have been installed correctly during the fabrication process of the Synthesized Signal Generator. This results in
intermittent opens between the connectors and transistor leads which then results in blown
fuses.
The connectors have been eliminated on newer instruments and the transistor leads are
being soldered directly to the mother boards.
1 of 2
AUTHOR: D.H.
ENTITY: 0400
© 1991 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
RESPONSIBLE ENTITY: 0400 UNTIL: September 1993
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 0.5 Hours
Continued
Page 2 Service Note 8671B-08
Solution:
A fix for intermittent fuse blowing has been made available. Check the Single Contact
connectors (P/N 1251-2313) for proper mechanical fit. The emitter and base leads of the
power supply pass transistors (A3Q1 through A3Q4) may make intermittent contact
with the surface of the connectors, causing current surges, which open up the power
supply fuses.
If it is determined that the connectors are at fault, the pass transistor leads should be
soldered directly to the board assembly. Because one faulty connector probably means
that all of the connectors were installed wrong, we recommend that the leads of all four
transistors be soldered.
There are no parts needed and no inventory involved with this modification.
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