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E4408B-07
S E R V I C E N O T E
Supersedes:
None
E4408B 26.5 GHz ESA Spectrum Analyzer
Serial Numbers U.S. Manufactured: US40520677 / US41190920
Serial Numbers Malaysia Manufactured: MY41000002 / MY41000020
Defective Field Effect Transistors may cause L.O. Unlevel or Source L.O.
Unlevel error message(s) on the display of the ESA.
To Be Performed By: Agilent Service Centers Only (ESA Adjustment & performance test
software is required to perform the rework.)
Parts Required:
P/N Description Qty.
E4403-69069 RF Assy. w/o option 1D5 1*
E4403-69071 RF Assy. w/ option 1D5 1*
E4404-69028 L.O. Amp/I.F. Switch Assy 1#
E4403-69041 Tracking Gen. Ctrl. Board Assy 1@
ADMINISTRATIVE INFORMATION
SERVICE NOTE CLASSIFICA TI ON:
MODIFIC ATION RECOMMENDED
ACTION [[]] IMMEDIATELY STANDARDS:
CATEGORY: X ON SPECIFIED FAILURE LABOR: 12.0 Hours
[[]] AGREEABLE TIME
LOCATION [[]] CUSTOMER INSTALLABLE SERVICE [[]] RETURN USED [[]] RETURN
CATEGORY: [[]] ON-SITE INVENTORY: [[]] SCRAP PARTS: [[]] SCRAP
X SERVICE CENTER X SEE TEXT X SEE TEXT
AVAILABILITY: PRODUCT’S SUPPORT LIFE AGILENT RESPONSIBLE UNTIL: End of GMS
AUTHOR: BD PRODUCT LINE: 12
ADDITIONAL INFORMATION: Send suspect assemblies via the exchange process since these assemblies are on the
exchange program.
© AGILENT TECHNOLOGIES, INC. 2002
PRINTED IN U.S.A.
February 15, 2002
Page 1 of 2
Page 2 of 2 E4408B-07
* Order the correct RF assembly based on if the instrument has option 1D5 or not.
# Order this assembly if the model is E4404B, E4405B, E4407B, E4408B, E7403A, E7404A,
or E7405A. The L.O.I.S. only goes into models that are 6.7 GHz and higher in frequency.
@ Order this assembly only if the instrument has option 1DN.
Situation:
Instruments within the listed serial range may fail and display one of two error messages on
the analyzer screen. The error messages are L.O. Unlevel and Source L.O. Unlevel. The
error messages depend on instrument model and options. If the error messages on the ESA or
EMC Analyzer display are “L.O. Unlevel” the Front End/L.O. board in the RF assembly on
the following models can cause this:
E4402B, E4403B, E4404B, E4405B, E4407B, E4408B, E7402A, E7403A, E7404A, and
E7405A. The L.O. Amp/I.F. Switch only on the following models can also cause this
message:
E4404B, E4405B, E4407B, E4408B, E7403A, E7404A, and E7405A.
The L.O. Amp/I.F. Switch assembly is NOT used in models E4402B, E4403B, and E7402A.
Therefore, if an L.O. Unlevel message occurs on the one of these models, only the RF
assembly should be changed out. All other models should have both the RF assembly and the
L.O. Amp/I.F. Switch assembly changed out.
If the error message is “Source L.O. Unlevel”, the 3.0 GHz Tracking Generator Control board
assembly can be the cause. This only relates to instruments with option 1DN, Tracking
Generator. NOTE: Assemblies should ONLY be changed if one of the two error messages is
displayed on the analyzer screen. The RF assembly has (4) 1855-1096 F.E.T.’s loaded on it.
The L.O. Amp/I.F. Switch has (6) F.E.T.’s loaded on it. The 3 GHz T.G. Control board
assembly has (8) F.E.T.’s loaded on it.
Solution/Action:
Agilent Service Centers should replace all suspect assemblies depending on instrument model and
option ONLY if the fail description on the returned instrument is L.O. Unlevel or Source L.O.
Unlevel.
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