83622B-04A
SERVICE NOTE
SUPERSEDES: 83622B-04
83622B Synthesized Sweeper
Serial Numbers: 0000A00000 / 9999Z99999
Torque on the nuts holding the FET’s on the A12 and A13 changing
and causing failures.
Duplicate Service Notes:
83620A-05A 83620B-05A 83621A-02A 83621B-02A
83622A-04A 83622B-04A 83623A-05A 83623B-05A
83623L-05A 83624A-04A 83624B-04A 83630A-06A
83630B-05A 83630L-05A 83631A-03A 83631B-02A
83640A-06A 83640B-06A 83640L-06A 83650A-06A
83650B-05A 83650L-05A 83651A-02A 83651B-02A
Situation:
On the A12 and A13 assemblies, the power FET’s mounted on the heat sinks can loosen over
time and cause these assemblies to fail. The insulator material thickness appears to change
causing the torque on the nuts holding the FET’s to change. The looser torque causes an
intermittent FET contact resulting in an A12 or A13 failure.
Solution / Action:
It is recommended anytime an 836x is in for repair and the covers removed, the torque on the
nuts holding the FET’s on the A12 and A13 assemblies be checked. The nuts should be
torqued to 6" lbs. Be careful not to over torque, 7" lbs can strip the stud. After torquing the
studs, re-flow the solder on the FET leads to reduce stress.
ADMINISTRATIVE INFORMATION
SERVICE NOTE CLASSIFICATION:
INFORMATION ONLY
AUTHOR:
DM
ENTITY:
5320
DATE: December 1999
ADDITIONAL INFORMATION:
© 1999 AGILENT TECHNOLOGIES
PRINTED IN U.S.A.
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